Climate Insights for Santa Rosa

The climate in Santa Rosa is warm and mild. The average annual temperature is 21°C and approximately 1314mm of precipitation falls per year. Santa Rosa receives a notable amount of rainfall throughout the year, including during its driest month. Santa Rosa is in the Southern Hemisphere. The seasons are reversed — summer runs from December to February, while winter falls between June and August. The summer months are: January, February, December. The coldest months are July, June, August, when temperatures can drop to 11°C.

Temperatures in Santa Rosa vary considerably across the year, with a 22°C difference between the coldest and warmest months. The warmest month is January, when average highs reach 33°C and the mean temperature sits around 27°C. July is the coolest month, with minimum temperatures around 11°C and an average of 16°C. On average, daily temperatures fluctuate by about 10°C between overnight lows and afternoon highs. The sharpest temperature change occurs between April and May, with a 4°C shift in average temperatures.

Santa Rosa is a fairly wet location, receiving approximately 1314mm of precipitation annually, which averages out to around 110mm per month. The wettest month is April, averaging 156mm of rainfall. November and October also tend to see above-average precipitation. The driest month is July, with just 42mm. That's 114mm less than April, the wettest month. Precipitation varies noticeably between seasons, with the first half (January to June) of the year generally seeing more rainfall.

Santa Rosa is mildly breezy, with an average annual wind speed of 19km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is October, averaging 22km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in February, with average winds dropping to 17km/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 autumn in Santa Rosa, which began on March 20, 2026. Santa Rosa is in the Southern Hemisphere, where the seasons are reversed — spring starts in September, summer in December, autumn in March, and winter in June. The warmest period peaks in January at around 33°C, while the coldest stretch bottoms out in July near 11°C. Winter is next, beginning on June 21, 2026 — 88 days from now.

The best time to visit Santa Rosa is during June, July and August, when the weather is most comfortable for travellers. During these months, average temperatures hover around 16°C with modest rainfall averaging 58mm per month. By contrast, January can be uncomfortably hot with temperatures reaching 33°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

The table below shows monthly climate averages for Santa Rosa 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.