Climate Insights for Hollister

The climate in Hollister is temperate. The average annual temperature is 15°C and approximately 474mm of precipitation falls per year. January is the wettest month, receiving around 134mm of rainfall. Hollister is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, June, August. The coldest months are December, February, January, when temperatures can drop to 5°C.

Temperatures in Hollister vary considerably across the year, with a 23°C difference between the coldest and warmest months. The warmest month is July, when average highs reach 28°C and the mean temperature sits around 20°C. December is the coolest month, with minimum temperatures around 5°C and an average of 9°C. On average, daily temperatures fluctuate by about 12°C between overnight lows and afternoon highs. The sharpest temperature change occurs between November and December, with a 4°C shift in average temperatures.

Hollister is a relatively dry area, receiving approximately 474mm of precipitation annually, which averages out to around 39mm per month. The wettest month is January, averaging 134mm of rainfall. March and October also tend to see above-average precipitation. The driest month is July, with just 0mm. That's 133mm 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.

Hollister 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 May, averaging 2km/h, though still comfortable for most outdoor activities. The calmest conditions occur in November, with average winds dropping to 1km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 1km/h gap between the calmest and windiest months.

It is currently summer in Hollister, which began on June 21, 2026. Hollister 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 28°C, while the coldest stretch bottoms out in December near 5°C. Autumn is next, beginning on September 23, 2026 — 52 days from now.

The best time to visit Hollister is during May, June, July, August, September and October, when the weather is most comfortable for travellers. During these months, average temperatures hover around 19°C with modest rainfall averaging 12mm per month. By contrast, December can be quite cold with temperatures dropping to 5°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Hollister 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.