Climate Insights for Rohnert Park

The climate in Rohnert Park is temperate. The average annual temperature is 14°C and approximately 711mm of precipitation falls per year. January is the wettest month, receiving around 151mm of rainfall. Rohnert Park is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, September, July. The coldest months are December, February, January, when temperatures can drop to 6°C.

Rohnert Park sees moderate temperature variation throughout the year, ranging from 6°C to 25°C. August is the warmest month, though highs remain moderate at 25°C with a mean of 18°C. December is the coolest month, with minimum temperatures around 6°C and an average of 10°C. On average, daily temperatures fluctuate by about 10°C between overnight lows and afternoon highs. The sharpest temperature change occurs between October and November, with a 4°C shift in average temperatures.

Rohnert Park is a relatively dry area, receiving approximately 711mm of precipitation annually, which averages out to around 59mm per month. The wettest month is January, averaging 151mm of rainfall. February and December also tend to see above-average precipitation. The driest month is July, with just 0mm. That's 151mm 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.

Rohnert Park is relatively calm, with an average annual wind speed of 9km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is May, averaging 11km/h, though still comfortable for most outdoor activities. The calmest conditions occur in November, with average winds dropping to 7km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 4km/h gap between the calmest and windiest months.

It is currently summer in Rohnert Park, which began on June 21, 2026. Rohnert Park 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 25°C, while the coldest stretch bottoms out in December near 6°C. Autumn is next, beginning on September 23, 2026 (7 days from now).

The best time to visit Rohnert Park is during May, June, July, August, September and October, when the weather is most comfortable for travellers. During these months, average temperatures hover around 17°C with modest rainfall averaging 11mm per month. By contrast, December 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 Rohnert Park 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.