Climate and monthly weather forecastCoos Bay, OR
Climate and monthly weather forecast
The climate of Coos Bay
Coos Bay is located in the state of Oregon, USA. It falls within the Mediterranean, warm summer zone of the Köppen Climate Classification, denoted as Csb. This classification implies a climate characterized by warm and dry summers, while winters are cool and mild. The city experiences a stable range of relative humidity throughout the year, fluctuating between 81% and 84%.The temperature in Coos Bay displays a significant range from month to month. The coldest temperatures are noted in January, with a low of 41.7°F (5.4°C), and the highest temperatures can be expected in the warmer months of July and August, reaching a high of 66.9°F (19.4°C). Even during the peak of summer, Coos Bay maintains a relatively mild climate, a signature characteristic of the Mediterranean climate zone.
Precipitation patterns in Coos Bay showcase a significant variation over the course of the year. The city stays dry in summer, with July recording the least rainfall of only 0.16" (4mm), while December experiences the most rainfall, nearly 5.87" (149mm). The average number of rainy days per month also corresponds to this pattern, with only an average of 3.6 rainy days in July but increasing to an average of 18.6 rainy days in December.
In Coos Bay, snowfall is relatively rare and when it occurs, it does so in very minute quantities. Only minor traces of snow have been recorded in January and December.
The best time to visit Coos Bay
Taking into account the climate factors of Coos Bay, the best time to visit predominantly depends on the visitor's preference for weather conditions. However, considering the temperature, rainfall, and sunny days, the period from June to September appears most favorable for outdoor activities. During these months, the temperature fluctuates between 58.6°F (14.8°C) and 65.8°F (18.8°C), and rainfall is significantly less, varying from 0.16" (4mm) to 1.1" (28mm).The worst time to visit Coos Bay
Since rainfall is quite abundant in winter months, from November to February, this period can be considered as the least favorable time to visit Coos Bay. December and January record the highest rainfall, 4.09" (104mm) and 5.87" (149mm) respectively, making it quite challenging for outdoor activities.Spring weather in Coos Bay
Spring in Coos Bay, from March to May, sees a rise in temperature from 51.8°F (11°C) in March to 58.6°F (14.8°C) by May. The rainfall also tends to decrease during spring from 4.02" (102mm) in March to 1.69" (43mm) in May. During these months, cloudy skies start to clear, and sunshine hours increase from 6 hours in March to 8.8 hours in May.Summer weather in Coos Bay
June marks the beginning of the summer season in Coos Bay. With temperatures staying between a comfortable 58.6°F (14.8°C) and 65.8°F (18.8°C), summer is characterized by long sunny days and scanty rainfall. From June to August, the city boasts an average of approximately 10 hours of sunshine per day and a substantial reduction in rainfall - from 1.69" (43mm) in June to a mere 0.16" (4mm) in July.Autumn weather in Coos Bay
Autumn weather in Coos Bay, from September to November, presents a gradual decrease in temperature, dropping from 65.8°F (18.8°C) in September to 54.1°F (12.3°C) by November. This season shows an increase in rainfall and a shortening of daylight hours. In November, rainfall measures up to 4.09" (104mm), and daylight hours are reduced to 9.7 hours per day.Winter weather in Coos Bay
Winter, from December to February, is characterized by cold temperatures, frequent rainfall, and fewer sunshine hours. December showcases the lowest average temperature of 41.7°F (5.4°C), highest average rainfall of 5.87" (149mm), and shortest daylight hours. Despite these less favorable conditions, snowfall remains remarkably rare in winter, with only minimal observations in the month of December.Weather in January
The year commences with January weather, characterized by mild temperatures and a relatively high level of humidity over Coos Bay, Oregon. Compared to other months, the precipitation remains abundant with rainfall of 5.16" (131mm). Weather in January »Weather in February
February's weather in Coos Bay, Oregon, reflects subtle differences when compared to January. The echoes of winter still resonate with a considerable amount of precipitation; however, rainfall decreases slightly to 4.84" (123mm). Weather in February »Weather in March
The transition from late-winter to early-spring strikes Coos Bay in March. The precipitation, though still significant, further softens down to 4.02" (102mm). Despite this drop, the weather maintains considerable humidity while the wind exhibits a minor spike, a common occurrence in Oregon around this period. Weather in March »Weather in April
April in Coos Bay sees a significant change in weather patterns, marking the spring season's full bloom. As temperatures steadily increase, the rainfall encounters a precipitous drop to 2.95" (75mm), allowing more dry days for outdoor adventures. Weather in April »Weather in May
Moving into May, the beautiful city of Coos Bay, Oregon, witnesses the maturation of spring. As the temperatures rise, the rainfall sees an even steeper decrease to 1.69" (43mm), bringing dryness and warmth in the air. The wind speed continues to ease off, and the broader daylight hours resonate with the blithe spirit of spring. Weather in May »Weather in June
June introduces summer to Coos Bay, and the weather takes on a decidedly warmer turn. As part of this transition, the rainfall plummets to a mere 0.75" (19mm), indicating one of the driest periods of the year. The wind holds steady, blowing at moderate speeds while the city experiences the longest daylight hours of the year. Weather in June »Weather in July
In Coos Bay, July signifies the height of summer. This month surprises with the scarce rainfall of 0.16" (4mm), indicating the driest spell of the year. The wind, though consistent, does not relieve the rising mercury levels. With longer days and fewer clouds, the city basks in abundant sunshine. Weather in July »Weather in August
The last summer month of August in Coos Bay sees mild changes in the weather. The rainfall takes a slight upward turn to 0.28" (7mm), yet the atmosphere remains predominantly dry. Slight changes in wind patterns accompany shifts in temperatures, hinting at autumn’s imminent arrival. Weather in August »Weather in September
September brings Coos Bay into the comfortable clasp of autumn. Compared to the peak summer months, rainfall escalates a little to 1.1" (28mm), offering relief from the intense dryness. The wind carries whispers of the approaching change, gathering momentum. Weather in September »Weather in October
October unveils the full impact of autumn on Coos Bay's weather. Heavy rainfall, up to 2.6" (66mm), becomes a more regular sight, cultivating a vibrant mix of hues in the city's foliage. Variable winds carry with them a cold sharpness, a reminder of the nearing winter. Weather in October »Weather in November
Arriving in November, the late-autumn in Coos Bay promises considerably cooler weather. Standing out is the noticeable rise in precipitation with rainfall surging to 4.09" (104mm). The wind also acquires a pronounced chill, blowing more strongly with a reminder of the winter to come. Weather in November »Weather in December
Finally, December rolls in, marking the advent of winter in Coos Bay. Seeing the highest rainfall of the year at 5.87" (149mm), the city is frequently under cloudy skies. Notably, the wind, bearing a cold snap, reaches its strongest speed in this month. Weather in December »Updated: Aug 29, 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
Throughout the year, there are 153 rainfall days, and 33.5" (851mm) of precipitation is accumulated.
January, February and November are months with snowfall.
Throughout the year, in Coos Bay, there are 0.7 snowfall days, and 0.31" (8mm) of snow is accumulated.
January and February, with an average of 4.4h of sunshine, are months with the least sunshine.
February and August, with an average relative humidity of 84%, are most humid months.
February is the month with the most snowfall. Snow falls for 0.3 days and accumulates 0.2" (5mm) of snow.
The months with the lowest UV index are February and December, with an average maximum UV index of 2.
In Coos Bay, snow does not fall in March through October and December.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from PST to PDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from PDT to PST.
The months with the lowest humidity are April and October, with an average relative humidity of 81%.
June has the longest days of the year, with an average of 15h and 24min of daylight.
July is the month with the least rainfall. Rain falls for 3.6 days and accumulates 0.16" (4mm) of precipitation.
With an average of 10.8h of sunshine, July has the most sunshine of the year.
July is the month with the highest UV index, with an average maximum UV index of 5.
August, with an average high of 66.9°F (19.4°C) and a low of 52.3°F (11.3°C), signifies the warmest month of the year in Coos Bay.
December is the coldest month, with the temperature often reaching an average high of 49.1°F (9.5°C) and an average low of 41.7°F (5.4°C).
December is the month with the most rainfall in Coos Bay. Rain falls for 18.6 days and accumulates 5.87" (149mm) of precipitation.
With an average of 9h and 0min of daylight, December has the shortest days of the year.
Average temperature
Coos Bay, OR
The warmest month (with the highest average high temperature) is August (66.9°F).
The month with the lowest average high temperature is December (49.1°F).
The month with the highest average low temperature is August (52.3°F).
The coldest months (with the lowest average low temperature) are February and December (41.7°F).
Average pressure
Coos Bay, OR
- Average pressure in January:
30.1"Hg - Average pressure in February:
30.07"Hg - Average pressure in March:
30.04"Hg - Average pressure in April:
30.09"Hg - Average pressure in May:
30.06"Hg - Average pressure in June:
30.06"Hg
- Average pressure in July:
30.05"Hg - Average pressure in August:
30.02"Hg - Average pressure in September:
30.01"Hg - Average pressure in October:
30.05"Hg - Average pressure in November:
30.06"Hg - Average pressure in December:
30.08"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is September (30.01"Hg).
Average wind speed
Coos Bay, OR
- Average wind speed in January:
8.8mph - Average wind speed in February:
8.4mph - Average wind speed in March:
9.1mph - Average wind speed in April:
8.5mph - Average wind speed in May:
8.1mph - Average wind speed in June:
8.3mph
- Average wind speed in July:
8.3mph - Average wind speed in August:
6.9mph - Average wind speed in September:
7.1mph - Average wind speed in October:
7.9mph - Average wind speed in November:
8.5mph - Average wind speed in December:
8.8mph
The windiest month (with the highest average wind speed) is March (9.1mph).
The calmest month (with the lowest average wind speed) is August (6.9mph).
Average humidity
Coos Bay, OR
The months with the highest relative humidity are February and August (84%).
The months with the lowest relative humidity are April and October (81%).
Average rainfall
Coos Bay, OR
- Average rainfall in January:
5.16" - Average rainfall in February:
4.84" - Average rainfall in March:
4.02" - Average rainfall in April:
2.95" - Average rainfall in May:
1.69" - Average rainfall in June:
0.75"
The wettest month (with the highest rainfall) is December (5.87").
The driest month (with the least rainfall) is July (0.16").
Average rainfall days
Coos Bay, OR
- Average rainfall days in January:
18.1 days - Average rainfall days in February:
16.7 days - Average rainfall days in March:
19.2 days - Average rainfall days in April:
16.7 days - Average rainfall days in May:
11.6 days - Average rainfall days in June:
8.6 days
- Average rainfall days in July:
3.6 days - Average rainfall days in August:
3.5 days - Average rainfall days in September:
7.1 days - Average rainfall days in October:
12.6 days - Average rainfall days in November:
16.7 days - Average rainfall days in December:
18.6 days
The month with the highest number of rainy days is March (19.2 days).
The month with the least rainy days is August (3.5 days).
Average snowfall
Coos Bay, OR
The month with the highest snowfall is February (0.2").
The months with the least snowfall are March, April, May, June, July, August, September, October and December (0").
Average snowfall days
Coos Bay, OR
- Average snowfall days in January:
0.1 days - Average snowfall days in February:
0.3 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 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0.2 days - Average snowfall days in December:
0.1 days
The month with the highest number of snowfall days is February (0.3 days).
The months with the least snowfall days are March, April, May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Coos Bay, OR
- Average daylight in January:
9h and 24min - Average daylight in February:
10h and 30min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 30min - Average daylight in May:
14h and 42min - Average daylight in June:
15h and 24min
- Average daylight in July:
15h and 0min - Average daylight in August:
13h and 54min - Average daylight in September:
12h and 30min - Average daylight in October:
11h and 0min - Average daylight in November:
9h and 42min - Average daylight in December:
9h and 0min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in January:
4h and 24min - Average sunshine in February:
4h and 24min - Average sunshine in March:
6h and 0min - Average sunshine in April:
7h and 42min - Average sunshine in May:
8h and 48min - Average sunshine in June:
9h and 42min
- Average sunshine in July:
10h and 48min - Average sunshine in August:
10h and 42min - Average sunshine in September:
9h and 36min - Average sunshine in October:
5h and 48min - Average sunshine in November:
5h and 0min - Average sunshine in December:
4h and 30min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The months with the least sunshine are January and February (Average sunshine: 4h and 24min).
Average sunshine days
Coos Bay, OR
- Average sunshine days in January:
11.6 days - Average sunshine days in February:
9.7 days - Average sunshine days in March:
9.8 days - Average sunshine days in April:
11.3 days - Average sunshine days in May:
16.8 days - Average sunshine days in June:
18.4 days
- Average sunshine days in July:
25.7 days - Average sunshine days in August:
25.4 days - Average sunshine days in September:
21.6 days - Average sunshine days in October:
16.1 days - Average sunshine days in November:
11.4 days - Average sunshine days in December:
10.8 days
The month with the most sunshine days is July (25.7 days).
The month with the least sunshine days is February (9.7 days).
Average UV index
Coos Bay, OR
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are February and December (UV index 2).
Average cloud cover
Coos Bay, OR
The month with the most cloud cover is February (Cloud cover 56).
The months with the least cloud cover are July and September (Cloud cover 28).
Average visibility
Coos Bay, OR
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
