Climate Insights for San Clemente

The climate in San Clemente is warm and mild. The average annual temperature is 19°C and approximately 194mm of precipitation falls per year. February is the wettest month, receiving around 64mm of rainfall. San Clemente 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: March, February, January. The coldest months are August, July, September, when temperatures can drop to 15°C.

San Clemente has relatively stable temperatures year-round, staying within a 9°C range. March is the warmest month, though highs remain moderate at 24°C with a mean of 21°C. August is the coolest month, with minimum temperatures around 15°C and an average of 18°C. Daily temperature variation is modest, with an average difference of 5°C between highs and lows.

San Clemente is a quite dry location, receiving approximately 194mm of precipitation annually, which averages out to around 16mm per month. The wettest month is February, averaging 64mm of rainfall. January and March also tend to see above-average precipitation. The driest month is July, with just 0mm. That's 64mm less than February, 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.

San Clemente is mildly breezy, with an average annual wind speed of 13km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is November, averaging 15km/h, though still comfortable for most outdoor activities. The calmest conditions occur in June, with average winds dropping to 12km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 3km/h between the calmest and windiest months.

It is currently autumn in San Clemente, which began on March 20, 2026. San Clemente 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 March at around 24°C, while the coldest stretch bottoms out in August near 15°C. Winter is next, beginning on June 21, 2026 — 89 days from now.

The best time to visit San Clemente is during January, February, March, April, May, June, July, August, September, October, November and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 19°C with modest rainfall averaging 16mm per month. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for San Clemente 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.