Climate Overview
The climate in Coos Bay is temperate. The average annual temperature is 12°C and approximately 2019mm of precipitation falls per year. October is the wettest month, receiving around 393mm of rainfall. Coos Bay is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, September, November. The coldest months are December, January, February, when temperatures can drop to 8°C.
Temperature
Coos Bay has relatively stable temperatures year-round, staying within a 7°C range. July is the warmest month, though highs remain moderate at 15°C with a mean of 14°C. December is the coolest month, with minimum temperatures around 8°C and an average of 9°C. Daily temperature variation is modest, with an average difference of 2°C between highs and lows. The sharpest temperature change occurs between November and December, with a 4°C shift in average temperatures.
Precipitation
Coos Bay is a very wet location, receiving approximately 2019mm of precipitation annually, which averages out to around 168mm per month. The wettest month is October, averaging 393mm of rainfall. November and March also tend to see above-average precipitation. The driest month is August, with just 8mm. That's 386mm less than October, 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.
Wind
Coos Bay is relatively calm, with an average annual wind speed of 7km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is March, averaging 8km/h, though still comfortable for most outdoor activities. The calmest conditions occur in April, with average winds dropping to 5km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 3km/h between the calmest and windiest months.
Seasons
52 days until Autumn
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 July at around 15°C, while the coldest stretch bottoms out in December near 8°C. Autumn is next, beginning on September 23, 2026 — 52 days from now.
Spring
Temperatures range from 10 to 13°C. Rainfall is heavy, totalling around 453mm across the season with a monthly average of 151mm. Winds are generally light, averaging 6km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 13 to 15°C. Rainfall is relatively light, with around 60mm over the season and a monthly average of 20mm. Winds are generally light, averaging 7km/h. Comfortable clothing with a light layer for cooler evenings is all you need.
Autumn
Temperatures range from 12 to 15°C. Rainfall is heavy, totalling around 801mm across the season with a monthly average of 267mm. Winds are generally light, averaging 7km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 8 to 12°C. Rainfall is heavy, totalling around 706mm across the season with a monthly average of 235mm. Winds are generally light, averaging 6km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.
Monthly Climate Data
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. 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.
