Climate Insights for Kelseyville

The climate in Kelseyville is temperate. The average annual temperature is 15°C and approximately 861mm of precipitation falls per year. January is the wettest month, receiving around 217mm of rainfall. Kelseyville is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, August, September. The coldest months are December, February, January, when temperatures can drop to 3°C. Light snow can occur between January and December.

Temperatures in Kelseyville vary considerably across the year, with a 29°C difference between the coldest and warmest months. The warmest month is July, when average highs reach 32°C and the mean temperature sits around 24°C. December is the coolest month, with minimum temperatures around 3°C and an average of 7°C. On average, daily temperatures fluctuate by about 12°C between overnight lows and afternoon highs. The sharpest temperature change occurs between October and November, with a 5°C shift in average temperatures.

Kelseyville is a moderately rainy area, receiving approximately 861mm of precipitation annually, which averages out to around 72mm per month. The wettest month is January, averaging 217mm of rainfall. February and March also tend to see above-average precipitation. The driest month is July, with just 0mm. That's 217mm 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 January and December, totalling around 29cm annually. January is the snowiest month with approximately 9cm.

Kelseyville is relatively calm, with an average annual wind speed of 2km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is June, averaging 2km/h, though still comfortable for most outdoor activities. The calmest conditions occur in November, with average winds dropping to 2km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 0km/h between the calmest and windiest months.

It is currently summer in Kelseyville, which began on June 21, 2026. Kelseyville 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 32°C, while the coldest stretch bottoms out in December near 3°C. Autumn is next, beginning on September 23, 2026 — 94 days from now.

The best time to visit Kelseyville is during May, June, July, August, September and October, when the weather is most comfortable for travellers. During these months, average temperatures hover around 20°C with modest rainfall averaging 18mm per month. By contrast, December can be quite cold with temperatures dropping to 3°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Kelseyville 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.