Climate Insights for San Clemente Island, San Clemente Island NALF

The climate in San Clemente Island, San Clemente Island NALF is temperate. The average annual temperature is 17°C and approximately 183mm of precipitation falls per year. January is the wettest month, receiving around 42mm of rainfall. San Clemente Island, San Clemente Island NALF is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: September, October, August. The coldest months are February, March, January, when temperatures can drop to 14°C.

San Clemente Island, San Clemente Island NALF has relatively stable temperatures year-round, staying within a 6°C range. September is the warmest month, though highs remain moderate at 20°C with a mean of 19°C. February is the coolest month, with minimum temperatures around 14°C and an average of 14°C. Daily temperature variation is modest, with an average difference of 1°C between highs and lows.

San Clemente Island, San Clemente Island NALF is a quite dry location, receiving approximately 183mm of precipitation annually, which averages out to around 15mm per month. The wettest month is January, averaging 42mm of rainfall. December and February also tend to see above-average precipitation. The driest month is August, with just 1mm. That's 41mm 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.

San Clemente Island, San Clemente Island NALF is relatively calm, with an average annual wind speed of 5km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is April, averaging 6km/h, though still comfortable for most outdoor activities. The calmest conditions occur in October, with average winds dropping to 4km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 2km/h gap between the calmest and windiest months.

It is currently summer in San Clemente Island, San Clemente Island NALF, which began on June 21, 2026. San Clemente Island, San Clemente Island NALF 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 September at around 20°C, while the coldest stretch bottoms out in February near 14°C. Autumn is next, beginning on September 23, 2026 — 74 days from now.

The best time to visit San Clemente Island, San Clemente Island NALF is during May, June, July, August, September, October, November and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 18°C with modest rainfall averaging 9mm per month. By contrast, February can be quite cold with temperatures dropping to 14°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 Island, San Clemente Island NALF 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.