Climate Overview
The climate in Santa Rosa is warm and mild. The average annual temperature is 19°C and approximately 3001mm 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: September, October, November. The coldest months are July, August, June, when temperatures can drop to 14°C.
Temperature
Santa Rosa has relatively stable temperatures year-round, staying within a 10°C range. September is the warmest month, though highs remain moderate at 24°C with a mean of 19°C. July is the coolest month, with minimum temperatures around 14°C and an average of 18°C. Daily temperature variation is modest, with an average difference of 8°C between highs and lows.
Precipitation
Santa Rosa is a very wet location, receiving approximately 3001mm of precipitation annually, which averages out to around 250mm per month. The wettest month is January, averaging 477mm of rainfall. February and December also tend to see above-average precipitation. The driest month is July, with just 78mm. That's 400mm 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.
Wind
Santa Rosa is relatively calm, with an average annual wind speed of 3km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is August, averaging 3km/h, though still comfortable for most outdoor activities. The calmest conditions occur in March, with average winds dropping to 3km/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.
Seasons
7 days until Spring
It is currently winter in Santa Rosa, which began on June 21, 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 September at around 24°C, while the coldest stretch bottoms out in July near 14°C. Spring is next, beginning on September 23, 2026 (7 days from now).
Spring
Temperatures range from 15 to 24°C. Rainfall is heavy, totalling around 690mm across the season with a monthly average of 230mm. Winds are generally light, averaging 3km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 16 to 24°C. Rainfall is heavy, totalling around 1314mm across the season with a monthly average of 438mm. Winds are generally light, averaging 3km/h. Comfortable clothing with a light layer for cooler evenings is all you need.
Autumn
Temperatures range from 15 to 24°C. Rainfall is heavy, totalling around 730mm across the season with a monthly average of 243mm. Winds are generally light, averaging 3km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 14 to 23°C. Precipitation is moderate at around 268mm for the season, averaging 89mm per month. Winds are generally light, averaging 3km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.
Best Time to Visit
The best time to visit Santa Rosa is during July and August, when the weather is most comfortable for travellers. During these months, average temperatures hover around 18°C with modest rainfall averaging 81mm per month. By contrast, September can be uncomfortably hot with temperatures reaching 24°C. Despite being the best months overall, some rain is still likely. Pack a waterproof layer and plan a mix of indoor and outdoor activities.
Monthly Climate Data
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.
