Climate Insights for Aliso Viejo

The climate in Aliso Viejo is temperate. The average annual temperature is 18°C and approximately 374mm of precipitation falls per year. January is the wettest month, receiving around 84mm of rainfall. Aliso Viejo is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, September. The coldest months are January, December, February, when temperatures can drop to 9°C.

Aliso Viejo sees moderate temperature variation throughout the year, ranging from 9°C to 29°C. The warmest month is August, when average highs reach 29°C and the mean temperature sits around 24°C. January is the coolest month, with minimum temperatures around 9°C and an average of 13°C. On average, daily temperatures fluctuate by about 9°C between overnight lows and afternoon highs. The sharpest temperature change occurs between October and November, with a 4°C shift in average temperatures.

Aliso Viejo is a quite dry location, receiving approximately 374mm of precipitation annually, which averages out to around 31mm per month. The wettest month is January, averaging 84mm of rainfall. March and February also tend to see above-average precipitation. The driest month is June, with just 1mm. That's 83mm 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.

Aliso Viejo is mildly breezy, with an average annual wind speed of 12km/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 14km/h, though still comfortable for most outdoor activities. The calmest conditions occur in December, with average winds dropping to 11km/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 spring in Aliso Viejo, which began on March 20, 2026. Aliso Viejo 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 August at around 29°C, while the coldest stretch bottoms out in January near 9°C. Summer is next, beginning on June 21, 2026 — 89 days from now.

The best time to visit Aliso Viejo is during April, May, June, July, August, September, October and November, when the weather is most comfortable for travellers. During these months, average temperatures hover around 20°C with modest rainfall averaging 12mm per month. By contrast, January can be quite cold with temperatures dropping to 9°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Aliso Viejo 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.