Mission Viejo (CA) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Mission Viejo.
Climate overview of Mission Viejo
The climate in Mission Viejo, California, United States of America, is marked by large temperature swings across the seasons, ranging from 31°C (88°F) in August to 19°C (66°F) in December.
The city has a relatively dry climate, receiving around 282 mm (11 in) of rainfall per year. It does experience a distinct dry season from March to November, with very warm summers and pleasant winters. December is the wettest month and June the driest. The most sunshine falls in July, with an average of 12.3 hours of daily sunshine.
Mission Viejo Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Mission Viejo - and find the best time to visit.
Monthly Temperature in Mission Viejo
In Mission Viejo, temperatures differ significantly between summer and winter months. On average, daytime temperatures range from a very warm 31°C (88°F) in August to a pleasant 19°C (66°F) in December.
Nighttime temperatures range from 17°C (63°F) in August to 8°C (46°F) in December.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Mission Viejo
Mission Viejo typically sees modest rainfall throughout the year, with an average annual precipitation of 282 mm (11 in). The seasons in Mission Viejo bring significant changes in precipitation. The wettest month, December, receives moderate rainfall, with an average of 81 mm (3.2 in) of precipitation. This rainfall is distributed across 8 rainy days.
In contrast, the driest month, June, experiences much less rainfall, totaling 0.5 mm (0.02 in) over a single rainy day. These distinct seasonal differences provide diverse experiences throughout the year. For more details, please visit our Mission Viejo Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Mission Viejo
In Mission Viejo, summer days are longer and more sunny, with daily sunshine hours peaking at 12.3 hours in July. As the darker season arrives, the brightness of the sun becomes less. January sees a soft sun for only 6.6 hours per average day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Best Time to Visit Mission Viejo
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: January, February, March, April, May, June, October and November
- Warmest weather: July, August and September
- Most sunshine: July and August
- Fewest rainy days: June, July, August and September
- Seasonal pattern: A distinct dry season from March to November, with very warm summers and pleasant winters
Frequently asked questions about the climate in Mission Viejo
What is the best time to visit Mission Viejo?
January, February, March, April, May, June, October and November typically offer the most optimal weather in Mission Viejo. In contrast, July, August, September and December tend to have less optimal conditions. Mission Viejo has a distinct dry season from March to November, with very warm summers and pleasant winters.
What temperatures can I expect in Mission Viejo?
Daytime highs range from 19°C (66°F) in December to 31°C (88°F) in August. Nighttime lows range from 8°C (46°F) to 17°C (63°F). Temperatures vary considerably through the year.
How much rain does Mission Viejo get?
Annual rainfall is around 282 mm (11 in). December is the wettest month with 81 mm (3.2 in), while June is the driest with 0.5 mm (0.02 in).
How sunny is Mission Viejo?
Mission Viejo receives around 3,279 hours of sunshine per year. July is the sunniest month with 369 hours, while January is the cloudiest with just 198 hours. Overall, Mission Viejo enjoys abundant sunshine.
Mission Viejo 3-Day Forecast
Mission Viejo (CA) 3-Day Forecast
Mission Viejo on the map
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