Climate Insights for San Clemente

The climate in San Clemente is temperate. The average annual temperature is 15°C and approximately 723mm of precipitation falls per year. June is the wettest month, receiving around 191mm 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: January, February, December. The coldest months are July, June, August, when temperatures can drop to 5°C.

Temperatures in San Clemente vary considerably across the year, with a 24°C difference between the coldest and warmest months. The warmest month is January, when average highs reach 29°C and the mean temperature sits around 21°C. July 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 March and April, with a 4°C shift in average temperatures.

San Clemente is a relatively dry area, receiving approximately 723mm of precipitation annually, which averages out to around 60mm per month. The wettest month is June, averaging 191mm of rainfall. July and August also tend to see above-average precipitation. The driest month is February, with just 2mm. That's 189mm less than June, 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 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 December, averaging 3km/h, though still comfortable for most outdoor activities. The calmest conditions occur in May, with average winds dropping to 2km/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 winter in San Clemente, which began on June 21, 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 January at around 29°C, while the coldest stretch bottoms out in July near 5°C. Spring is next, beginning on September 23, 2026 — 92 days from now.

The best time to visit San Clemente is during January, February, March, November and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 19°C with modest rainfall averaging 9mm per month. By contrast, July 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 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.