Climate and monthly weather forecastGuayanilla, PR
Climate and monthly weather forecast
The climate of Guayanilla
Guayanilla, Puerto Rico rests under the tropical monsoon climate, classified as Am by the Köppen climate system. The geographical positioning of this city allows it to experience year-round warmth, with temperatures rarely straying from a comfortable 70°F (21.1°C) to 87°F (30.6°C).Humidity throughout the year fluctuates just slightly, ranging from 75% in March to a higher 80% in November. Rainfall exhibits a more noticeable variance. The months with the least rainfall see about approximately 0.71" (18mm) in January, while those with the most rainfall in September witness 3.58" (91mm). There are about 15 to 23 days of rainfall per month.
Notably, snowfall is not a characteristic of this location's climate, as evident by the absence of snowfall days throughout the year. As expected in a tropical region, sunshine takes the stage with about 11.1 hours to a peak of 13.2 hours per day from December to June. However, only 5.1 days to 12.2 days per month are classified as sunny days, due to swiftly moving cloud cover.
Days of strong wind are rare, with maximum wind speeds typically remaining between 6.2mph (10km/h) in September to 8.8mph (14.2km/h) in July.
The best time to visit Guayanilla
The optimal visiting period for Guayanilla, Puerto Rico hinges on one's preference for sun versus rain. For those who favor sunny days, May through June offers the most hours of sunlight per day, with 13 hours to 13.2 hours respectively. This time period is also characterized by an increased percentage of sunny days per month, specifically, 12.2 days in June.Those whom are more rain inclined, however, will find the late summer to early autumn months of August to September more desirable. These months experience the most rain, with an average of 3.11" (79mm) to 3.58" (91mm).
The worst time to visit Guayanilla
In contrast, November is arguably the least favorable time for a visit. It is the month with the highest relative humidity at 80%, coupled with an increased number of rainy days at 22.5 days out of the month.Spring weather in Guayanilla
Spring in Guayanilla features moderate rainfall ranging from 1.34" (34mm) in April to 2.05" (52mm) in May. Temperatures offer a comfortable warmth, varying between a low of 71.4°F (21.9°C) in March to a high of 85.8°F (29.9°C) in May. The number of daylight hours increases throughout spring, from 12.1 hours in March to 13.2 hours in May.Summer weather in Guayanilla
The zenith of summer in Guayanilla translates to warmer temperatures, with August and July tying for highest recorded temperatures at 86.5°F (30.3°C). Rainfall also experiences a spike, with the highest amount of 3.11" (79mm) in August. Wind speeds are noticeably higher during this season, especially in July, registering 8mph (12.9km/h) on average and peaking at 11.2mph (18km/h).Autumn weather in Guayanilla
Autumn continues the trend of warmth, with an average of 76.5°F (24.7°C) in November to a higher 86.2°F (30.1°C) in September. This season sees the most rainfall, peaking in September at 3.58" (91mm), with an average of 21 rainy days per month. Daylight hours and sunny days per month start to decrease.Winter weather in Guayanilla
Winter in Guayanilla does not mimic the typically chilly conditions associated with the season, as temperatures range from 72°F (22.2°C) in January to a high of 82.4°F (28°C) in December. Rainfall measures at lower values between 0.71" (18mm) to 1.22" (31mm). December has the least number of daylight hours at 11.1 hours, yet the number of sunny days per month increases to 9.4 days.Weather in January
For many, the weather in Guayanilla, Puerto Rico is mostly favorable with an enjoyable mix of sunshine and mild temperatures. The year kicks off with a gentle push of wind with a speed of 7mph (11.3km/h), gusting up to 10.2mph (16.4km/h). Weather in January »Weather in February
As January gives way to February, the weather in Guayanilla doesn't stray far from its steady temperate rhythm. An increment in the average daylight hours from 11.2 hours in January to 11.6 hours in February marks the arrival of lengthier, sun-drenched days. Weather in February »Weather in March
March in Guayanilla retains the city's warm clime, characterizing a trademark blend of consistent temperatures and humidity. Transitioning from February, the UV index in March maintains a level of 6, indicating a moderate risk of harm from unprotected sun exposure. Weather in March »Weather in April
Gradually inching towards the heart of the year, the weather in April in Guayanilla veers to a more tropic atmosphere. The blend of weather conditions from the preceding months progresses to warmer days, and a fair amount of sunshine, coupled with an appreciable share of rainfall. Weather in April »Weather in May
In Guayanilla, May is the harbinger of a tropical weather shift. This transition is marked by a gradual progression from the mild conditions observed in April to a more distinctive warm and moist climate typical of island living. Alongside this fundamental shift, the city experiences its highest rainfall of the year, a substantial 2.05" (52mm). Weather in May »Weather in June
June's welcome in Guayanilla comes swathed in a distinctive warmth; it's a month where the city truly flaunts its tropical persona. The mercury tends to push a little further, while the humidity takes a step back, creating an agreeable harmony. Weather in June »Weather in July
As the calendar flips to July, Guayanilla witnesses another month of warm temperatures and humidity. The mercury tops the scale, reaching a peak average high of 86.4°F (30.2°C) for the year, indicating the arrival of Guayanilla's hottest month. Weather in July »Weather in August
In Guayanilla, August carries along a similar temperature trend as July, with high temperatures and an increased chance of rain showers. Weather conditions remain fairly stable, striking a pleasant balance between warm days and slightly cooler nights. Weather in August »Weather in September
September in Guayanilla, Puerto Rico brings slightly cooler temperatures and a hint of rainfall. The high temperature takes a slight dip down to 86.2°F (30.1°C), and the city experiences its year's highest average rainfall of 3.58" (91mm). Weather in September »Weather in October
As October arrives in Guayanilla, the weather undergoes another gradual change. The lushness resultant from September's generous rainfall gives way to a more crisp and clear atmosphere. Average daily sunshine hours drop slightly to 8.5 hours, allowing for less intense and more comfortable afternoons. Weather in October »Weather in November
November brings Guayanilla closer to winter but the city's weather largely retains its tropical character. Average daylight hours decrease marginally, yet the city remains well-lit till late afternoon. The city sees a further decrease in temperature, with a high temperature dropping down to 83.8°F (28.8°C). Weather in November »Weather in December
As Guayanilla welcomes December, the weather remains warm yet comfortable. Light winds of 6.7mph (10.8km/h) bring a soothing touch to the city's predictable tropical weather. Signifying the end of the calendar year, December notes a decline in the city's temperature, recording a high of 82.4°F (28°C). Weather in December »Updated: Feb 13, 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
January, noted for its average high-temperature of 81.9°F (27.7°C) and an average low-temperature of 72°F (22.2°C), is considered the coldest month.
January is the month with the least rainfall. Rain falls for 15.6 days and accumulates 0.71" (18mm) of precipitation.
In Guayanilla, during the entire year, the rain falls for 224.9 days and collects up to 23.58" (599mm) of precipitation.
January through August, October through December are months without snowfall in Guayanilla.
In Guayanilla, Puerto Rico, during the entire year, snow falls for 0.1 days.
The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 6.
With an average relative humidity of 75%, March is the least humid month.
April through October, with an average maximum UV index of 7, are months with the highest UV index in Guayanilla, Puerto Rico.
The month with the longest days in Guayanilla is June, with an average of 13h and 12min of daylight.
June has the most sunshine of the year in Guayanilla, with an average of 11.3h of sunshine.
August stands out as Guayanilla's warmest month, with temperatures ranging between an average high of 86.5°F (30.3°C) and a low of 76.6°F (24.8°C).
The month with the most rainfall is September, when the rain falls for 20.9 days and typically aggregates up to 3.58" (91mm) of precipitation.
September is the only month when snow falls.
The month with the most snowfall days in Guayanilla is September, when snow falls for 0.1 days.
The most humid month in Guayanilla is November, with an average relative humidity of 80%.
With an average of 7.1h of sunshine, November has the least sunshine of the year in Guayanilla.
With an average of 11h and 6min of daylight, December has the shortest days of the year in Guayanilla.
Guayanilla, Puerto Rico, does not observe Daylight Saving Time (DST). AST timezone is used over the entire year.
Average temperature
Guayanilla, PR
The warmest month (with the highest average high temperature) is August (86.5°F).
The month with the lowest average high temperature is January (81.9°F).
The months with the highest average low temperature are July, August and October (76.6°F).
The coldest month (with the lowest average low temperature) is March (71.4°F).
Average pressure
Guayanilla, PR
- Average pressure in January:
30.01"Hg - Average pressure in February:
30.01"Hg - Average pressure in March:
30"Hg - Average pressure in April:
29.98"Hg - Average pressure in May:
29.97"Hg - Average pressure in June:
30"Hg
- Average pressure in July:
30"Hg - Average pressure in August:
29.96"Hg - Average pressure in September:
29.92"Hg - Average pressure in October:
29.89"Hg - Average pressure in November:
29.9"Hg - Average pressure in December:
29.97"Hg
The months with the highest atmospheric pressure are January and February (30.01"Hg).
The month with the lowest atmospheric pressure is October (29.89"Hg).
Average wind speed
Guayanilla, PR
- Average wind speed in January:
7mph - Average wind speed in February:
7.1mph - Average wind speed in March:
6.8mph - Average wind speed in April:
7mph - Average wind speed in May:
7.2mph - Average wind speed in June:
7.7mph
- Average wind speed in July:
8mph - Average wind speed in August:
7.5mph - Average wind speed in September:
6.2mph - Average wind speed in October:
5.8mph - Average wind speed in November:
5.6mph - Average wind speed in December:
6.7mph
The windiest month (with the highest average wind speed) is July (8mph).
The calmest month (with the lowest average wind speed) is November (5.6mph).
Average humidity
Guayanilla, PR
The month with the highest relative humidity is November (80%).
The month with the lowest relative humidity is March (75%).
Average rainfall
Guayanilla, PR
- Average rainfall in January:
0.71" - Average rainfall in February:
0.83" - Average rainfall in March:
1.46" - Average rainfall in April:
1.34" - Average rainfall in May:
2.05" - Average rainfall in June:
1.5"
- Average rainfall in July:
2.2" - Average rainfall in August:
3.11" - Average rainfall in September:
3.58" - Average rainfall in October:
3.11" - Average rainfall in November:
2.48" - Average rainfall in December:
1.22"
The wettest month (with the highest rainfall) is September (3.58").
The driest month (with the least rainfall) is January (0.71").
Average rainfall days
Guayanilla, PR
- Average rainfall days in January:
15.6 days - Average rainfall days in February:
14.8 days - Average rainfall days in March:
18.4 days - Average rainfall days in April:
19.3 days - Average rainfall days in May:
21.6 days - Average rainfall days in June:
15.1 days
- Average rainfall days in July:
18.3 days - Average rainfall days in August:
20.2 days - Average rainfall days in September:
20.9 days - Average rainfall days in October:
21.9 days - Average rainfall days in November:
22.5 days - Average rainfall days in December:
16.3 days
The month with the highest number of rainy days is November (22.5 days).
The month with the least rainy days is February (14.8 days).
Average snowfall days
Guayanilla, PR
- Average snowfall days in January:
0 days - Average snowfall days in February:
0 days - Average snowfall days in March:
0 days - Average snowfall days in April:
0 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:
0.1 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0 days - Average snowfall days in December:
0 days
The month with the highest number of snowfall days is September (0.1 days).
The months with the least snowfall days are January, February, March, April, May, June, July, August, October, November and December (0 days).
Average daylight / Average sunshine
Guayanilla, PR
- Average daylight in January:
11h and 12min - Average daylight in February:
11h and 36min - Average daylight in March:
12h and 6min - Average daylight in April:
12h and 36min - Average daylight in May:
13h and 0min - Average daylight in June:
13h and 12min
- Average daylight in July:
13h and 6min - Average daylight in August:
12h and 42min - Average daylight in September:
12h and 12min - Average daylight in October:
11h and 42min - Average daylight in November:
11h and 18min - Average daylight in December:
11h and 6min
The month with the longest days is June (Average daylight: 13h and 12min).
The month with the shortest days is December (Average daylight: 11h and 6min).
- Average sunshine in January:
9h and 18min - Average sunshine in February:
9h and 6min - Average sunshine in March:
8h and 42min - Average sunshine in April:
9h and 0min - Average sunshine in May:
10h and 42min - Average sunshine in June:
11h and 18min
- Average sunshine in July:
9h and 54min - Average sunshine in August:
9h and 0min - Average sunshine in September:
9h and 24min - Average sunshine in October:
8h and 30min - Average sunshine in November:
7h and 6min - Average sunshine in December:
7h and 24min
The month with the most sunshine is June (Average sunshine: 11h and 18min).
The month with the least sunshine is November (Average sunshine: 7h and 6min).
Average sunshine days
Guayanilla, PR
- Average sunshine days in January:
10.8 days - Average sunshine days in February:
9.4 days - Average sunshine days in March:
9.2 days - Average sunshine days in April:
7.6 days - Average sunshine days in May:
7.3 days - Average sunshine days in June:
12.2 days
- Average sunshine days in July:
10.1 days - Average sunshine days in August:
7.7 days - Average sunshine days in September:
6.6 days - Average sunshine days in October:
6.3 days - Average sunshine days in November:
5.1 days - Average sunshine days in December:
9.4 days
The month with the most sunshine days is June (12.2 days).
The month with the least sunshine days is November (5.1 days).
Average UV index
Guayanilla, PR
The months with the highest UV index are April, May, June, July, August, September and October (UV index 7).
The months with the lowest UV index are January, February, March, November and December (UV index 6).
Average cloud cover
Guayanilla, PR
The month with the most cloud cover is May (Cloud cover 30).
The months with the least cloud cover are January and February (Cloud cover 22).
Average visibility
Guayanilla, PR
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).
