Climate and monthly weather forecastWesterly, RI
Climate and monthly weather forecast
The climate of Westerly
Westerly, Rhode Island, USA has a Köppen climate classification of Cfb, commonly referred to as a Marine West Coast, warm summer type. This is because it falls within a geographical area that experiences moderate temperatures, high humidity, and significant rainfall spread throughout the year.The most noteworthy climatological parameters in Westerly are the temperature fluctuations throughout the various seasons, marked shifts in daylight hours, and consistently high relative humidity levels. The highest temperatures usually range between 36.7°F (2.6°C) and 77.7°F (25.4°C), while the lowest temperatures oscillate between 27°F (-2.8°C) and 67.1°F (19.5°C). Relative humidity maintains a relatively steady gradient from 74% to 81%, indicating a persistently damp and mild climate.
Rainfall in Westerly tends to be constant all year round with values varying from 1.73" (44mm) to 3.39" (86mm) per month. However, the town does experience a slightly wetter period from September to December, with October receiving the highest volume of rainfall at approximately 3.23" (82mm). On the other hand, the months from January to August receive comparatively less rainfall with the driest month, September, recording an average rainfall of 1.73" (44mm).
The best time to visit Westerly
Given the nature of the climate, it can be suggested that the best time to visit Westerly is during summer, from June to August. This period offers peak conditions with an average maximum temperature of 77.5°F (25.3°C) in August and minimal rainfall. Additionally, average wind speeds are substantially lower, dropping to below 9mph (14.5km/h), promising calmer, more enjoyable outdoor conditions. Summer also boasts the longest daylight hours, peaking at 15.1 hours in June, alongside a high UV index of 6 during the summer months.The worst time to visit Westerly
Whilst Westerly offers relatively pleasant weather year-round, the winter months of December to February can prove more challenging for visitors. The average temperatures dip to a low of 27°F (-2.8°C) in January and February with the highest not exceeding 38.3°F (3.5°C) in February. In conjunction with the cold, the winter months witness the shortest daylight hours, standing at just over 9 hours in December. Snowfall is also a common winter occurrence with an average of 1.26" (32mm) in December and slightly increasing to 1.69" (43mm) in February.Spring weather in Westerly
Come Spring, Westerly undergoes a steadfast meteorological transformation from March to May. Temperatures swiftly elevate from a lower average of 33.4°F (0.8°C) in March to a higher average of 51.1°F (10.6°C) in May. Maximum average temperatures also follow this trend, starting from 43.5°F (6.4°C) in March to peak at 62.2°F (16.8°C) in May. Simultaneously, daylight hours increase steadily from 12 hours in March to about 14.5 hours by the end of Spring.Summer weather in Westerly
Summers in Westerly offer warm, enjoyable weather that prevails from June to August. The average lower temperatures scale up from 59.4°F (15.2°C) in June to 67.1°F (19.5°C) in July, whilst the average higher temperatures rise from 70.3°F (21.3°C) in June to around 77.5°F (25.3°C) in August. Amid this heat, rainfall levels decline, making it the driest season.Autumn weather in Westerly
Autumn ushers in a noticeable drop in temperature from September to November. The average minimum temperature fluctuates from 60.4°F (15.8°C) in September down to 41.5°F (5.3°C) by November. Likewise, the maximum averages follow reducing from 71.2°F (21.8°C) in September to 51.3°F (10.7°C) in November. Rainfall levels, however, do undergo an increase during Autumn, with October receiving the highest annual volume.Winter weather in Westerly
Wintertime in Westerly, from December to February, is characterized by low temperatures and shorter days. The thermometer registers average minimum temperatures from 33.4°F (0.8°C) in December to 27°F (-2.8°C) in January and February. Similarly, maximum averages only reach between 36.7°F (2.6°C) and 38.3°F (3.5°C) during the peak of winter. Adding to the chill, daylight hours dip to roughly 9 hours in December, the shortest for the year.Weather in January
In the early stages of the year, Westerly, Rhode Island undergoes chilly temperatures with even colder wind speeds. Higher than average humidity levels intensify the bitter conditions, making this month a particular favorite for indoor activities. Weather in January »Weather in February
Coming into February, Westerly braves the chilly air despite a slight hike in minimum temperatures. The city experiences an increase in daylight hours, allowing for more outdoor activities dependent on sunlight. The snowfall persists, mainly during the early part of the month, tapering off as February closes. Weather in February »Weather in March
As Westerly, Rhode Island advances into March, overall atmospheric conditions shift. Residents start to feel the end of the cold season, with a notable rise in average temperatures. The spring awakening begins as daylight hours extend, paving the way for more outdoor pursuits under the sun. Weather in March »Weather in April
Nearing the middle of the year, April in Westerly experiences a dramatic change in climate. Temperature hikes continue to spell the end of the cold season, with most days marked by comfortable cool conditions. The extended daylight hours combined with increased sunshine hours boost the popularity of outdoor activities. Weather in April »Weather in May
The entrance of May signifies the start of Westerly, Rhode Island's warm season. As the cold season recedes further into the past, residents enjoy the sun's lingering presence in the sky longer. The increase in daylight and sunshine hours since April encourages more outdoor activities, marking the beginning of the summer season. Weather in May »Weather in June
As summer officially arrives in Westerly, temperatures continue to escalate steadily. Residents relish in the extended hours of daylight furthered since May, enabling more engagement in outdoor ventures. Despite the slightly higher humidity levels, the overall feel remains comfortable due to pleasant temperatures and a gradual decrease in cloud cover. Weather in June »Weather in July
With July in full swing, Westerly now fully embraces the summer heat, registering the highest temperatures of the year. The city benefits from lengthy daylight hours, elevating the popularity of outdoor excursions. Even as precipitation primarily falls as rainfall, the city keeps its charm under mostly clear skies. Weather in July »Weather in August
Despite the slight dip in temperatures from July, August retains Westerly's summer vibrance. The city bathes under the sun's continued dominance, favoring prolonged outdoor activities. Reduced cloud cover in August allows for mostly clear skies, despite slightly lower sunshine hours compared to July. Weather in August »Weather in September
In September, Westerly starts to witness a slowly fading summer, with slight declines in temperature from August. The decline in daylight hours hints at the onset of autumn. There is an appreciated drop in humidity, making outdoor excursions less muggy. Weather in September »Weather in October
As Westerly ushers in October, autumn's presence becomes more pronounced, with temperatures consistently falling. The dwindling daylight hours give way to earlier sunsets, paralleling shorter outdoor activity cycles. Cloud cover remains relatively unchanged from September, maintaining a steady precipitation pattern. Weather in October »Weather in November
November in Westerly signals the start of the transition from autumn to winter, with a noticeable drop in temperatures. Daylight hours become even fewer, indicating the close of autumn and the imminent arrival of winter. Air pressure gradually rises across the month, bringing crisp and clean air quality. Weather in November »Weather in December
As Westerly rounds off the year in December, winter arrives with a pronounced drop in temperatures. Daylight hours decline to the fewest of the year, matching the billowing winter season in Westerly. A clear shift occurs from rain to snow as the dominant form of precipitation. Weather in December »Updated: Jul 7, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
The coldest temperatures occur during January, when averages reach a peak of 36.7°F (2.6°C) and a low of 27°F (-2.8°C).
In Westerly, during the entire year, the rain falls for 154.5 days and collects up to 31.46" (799mm) of precipitation.
January through April, November and December are months with snowfall.
In Westerly, during the entire year, snow falls for 18.6 days and aggregates up to 6.26" (159mm) of snow.
The months with the lowest UV index are January through March and December, with an average maximum UV index of 2.
February and December, with an average of 4.9h of sunshine, are months with the least sunshine.
The months with the lowest humidity are March and November, with an average relative humidity of 74%.
The month with the most snowfall is March, when snow falls for 3.6 days and typically aggregates up to 1.85" (47mm) of snow.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from EDT to EST.
In Westerly, Rhode Island, snow does not fall in May through October.
The months with the highest humidity are June and July, with an average relative humidity of 81%.
With an average of 15h and 6min of daylight, June has the longest days of the year.
June through August, with an average maximum UV index of 6, are months with the highest UV index.
July is the warmest month, with an average high-temperature of 77.7°F (25.4°C) and an average low-temperature of 67.1°F (19.5°C).
With an average of 10.6h of sunshine, August has the most sunshine of the year in Westerly.
September is the month with the least rainfall. Rain falls for 12.9 days and accumulates 1.73" (44mm) of precipitation.
December is the month with the most rainfall. Rain falls for 11.5 days and accumulates 3.39" (86mm) of precipitation.
With an average of 9h and 12min of daylight, December has the shortest days of the year.
Average temperature
Westerly, RI
The warmest month (with the highest average high temperature) is July (77.7°F).
The month with the lowest average high temperature is January (36.7°F).
The month with the highest average low temperature is July (67.1°F).
The coldest month (with the lowest average low temperature) is January (27°F).
Average pressure
Westerly, RI
- Average pressure in January:
30.02"Hg - Average pressure in February:
30"Hg - Average pressure in March:
30.03"Hg - Average pressure in April:
29.98"Hg - Average pressure in May:
30.01"Hg - Average pressure in June:
29.93"Hg
- Average pressure in July:
29.95"Hg - Average pressure in August:
29.98"Hg - Average pressure in September:
30.05"Hg - Average pressure in October:
30.01"Hg - Average pressure in November:
30.08"Hg - Average pressure in December:
30.04"Hg
The month with the highest atmospheric pressure is November (30.08"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed
Westerly, RI
- Average wind speed in January:
12.5mph - Average wind speed in February:
12.2mph - Average wind speed in March:
12.4mph - Average wind speed in April:
11.4mph - Average wind speed in May:
9.8mph - Average wind speed in June:
8.8mph
- Average wind speed in July:
8.3mph - Average wind speed in August:
8.3mph - Average wind speed in September:
9.4mph - Average wind speed in October:
11mph - Average wind speed in November:
11.6mph - Average wind speed in December:
12mph
The windiest month (with the highest average wind speed) is January (12.5mph).
The calmest months (with the lowest average wind speed) are July and August (8.3mph).
Average humidity
Westerly, RI
The months with the highest relative humidity are June and July (81%).
The months with the lowest relative humidity are March and November (74%).
Average rainfall
Westerly, RI
- Average rainfall in January:
2.24" - Average rainfall in February:
2.24" - Average rainfall in March:
2.56" - Average rainfall in April:
2.99" - Average rainfall in May:
2.48" - Average rainfall in June:
2.76"
- Average rainfall in July:
2.72" - Average rainfall in August:
2.56" - Average rainfall in September:
1.73" - Average rainfall in October:
3.23" - Average rainfall in November:
2.56" - Average rainfall in December:
3.39"
The wettest month (with the highest rainfall) is December (3.39").
The driest month (with the least rainfall) is September (1.73").
Average rainfall days
Westerly, RI
- Average rainfall days in January:
8.6 days - Average rainfall days in February:
9.5 days - Average rainfall days in March:
11.3 days - Average rainfall days in April:
14.3 days - Average rainfall days in May:
15.3 days - Average rainfall days in June:
15.5 days
- Average rainfall days in July:
17.3 days - Average rainfall days in August:
16.1 days - Average rainfall days in September:
12.9 days - Average rainfall days in October:
12.7 days - Average rainfall days in November:
9.5 days - Average rainfall days in December:
11.5 days
The month with the highest number of rainy days is July (17.3 days).
The month with the least rainy days is January (8.6 days).
Average snowfall
Westerly, RI
The month with the highest snowfall is March (1.85").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
Westerly, RI
- Average snowfall days in January:
5.6 days - Average snowfall days in February:
5 days - Average snowfall days in March:
3.6 days - Average snowfall days in April:
0.3 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0.6 days - Average snowfall days in December:
3.5 days
The month with the highest number of snowfall days is January (5.6 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Westerly, RI
- Average daylight in January:
9h and 36min - Average daylight in February:
10h and 36min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 24min - Average daylight in May:
14h and 30min - Average daylight in June:
15h and 6min
- Average daylight in July:
14h and 48min - Average daylight in August:
13h and 48min - Average daylight in September:
12h and 30min - Average daylight in October:
11h and 6min - Average daylight in November:
9h and 54min - Average daylight in December:
9h and 12min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in January:
5h and 12min - Average sunshine in February:
4h and 54min - Average sunshine in March:
6h and 12min - Average sunshine in April:
8h and 30min - Average sunshine in May:
8h and 42min - Average sunshine in June:
9h and 36min
- Average sunshine in July:
10h and 30min - Average sunshine in August:
10h and 36min - Average sunshine in September:
9h and 0min - Average sunshine in October:
6h and 18min - Average sunshine in November:
5h and 30min - Average sunshine in December:
4h and 54min
The month with the most sunshine is August (Average sunshine: 10h and 36min).
The months with the least sunshine are February and December (Average sunshine: 4h and 54min).
Average sunshine days
Westerly, RI
- Average sunshine days in January:
17.4 days - Average sunshine days in February:
14.6 days - Average sunshine days in March:
16.1 days - Average sunshine days in April:
14.3 days - Average sunshine days in May:
13.3 days - Average sunshine days in June:
12.3 days
- Average sunshine days in July:
11 days - Average sunshine days in August:
12.3 days - Average sunshine days in September:
14.9 days - Average sunshine days in October:
15.6 days - Average sunshine days in November:
18.3 days - Average sunshine days in December:
17 days
The month with the most sunshine days is November (18.3 days).
The month with the least sunshine days is July (11 days).
Average UV index
Westerly, RI
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, March and December (UV index 2).
Average cloud cover
Westerly, RI
The months with the most cloud cover are March and December (Cloud cover 47).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility
Westerly, RI
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
