Climate Insights for Coos Bay

The climate in Coos Bay is temperate. The average annual temperature is 12°C and approximately 1347mm of precipitation falls per year. January is the wettest month, receiving around 227mm of rainfall. Coos Bay is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, September. The coldest months are February, March, January, when temperatures can drop to 6°C. Light snow can occur between February and December.

Coos Bay sees moderate temperature variation throughout the year, ranging from 6°C to 20°C. August is the warmest month, though highs remain moderate at 20°C with a mean of 16°C. February is the coolest month, with minimum temperatures around 6°C and an average of 8°C. Daily temperature variation is modest, with an average difference of 6°C between highs and lows. The sharpest temperature change occurs between October and November, with a 3°C shift in average temperatures.

Coos Bay is a fairly wet location, receiving approximately 1347mm of precipitation annually, which averages out to around 112mm per month. The wettest month is January, averaging 227mm of rainfall. December and March also tend to see above-average precipitation. The driest month is July, with just 3mm. That's 224mm less than January, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic. Light snowfall can occur between February and December, totalling around 11cm annually. February is the snowiest month with approximately 6cm.

Coos Bay is mildly breezy, with an average annual wind speed of 14km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is January, averaging 17km/h, though still comfortable for most outdoor activities. The calmest conditions occur in September, with average winds dropping to 12km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 5km/h between the calmest and windiest months.

It is currently summer in Coos Bay, which began on June 21, 2026. Coos Bay is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in August at around 20°C, while the coldest stretch bottoms out in February near 6°C. Autumn is next, beginning on September 23, 2026 (7 days from now).

The best time to visit Coos Bay is during July, August and September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 16°C with modest rainfall averaging 16mm per month. By contrast, February can be quite cold with temperatures dropping to 6°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Coos Bay based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.