Mission Viejo Climate by Month
Mission Viejo, California, United States
Warm summers and mild winters, with little rain, mostly from December to March.
The climate in Mission Viejo is one of warm summers and mild winters, with little rain, mostly from December to March. Afternoon highs range from 68°F (20°C) in December to 85°F (29°C) in August, and December nights average 44°F (7°C). It gets only 12 in (303 mm) of rain a year. May to September are almost completely dry.
- Warmest month
- 85°F(29°C)
- Average high, August
- Coldest nights
- 44°F(7°C)
- Average low, December
- Rain per year
- 12 in(303 mm)
- Wettest: February
- Humidity
- 57%
- Sunniest: June
Best and worst months in Mission Viejo
Best for weatherMay, June and November are the best time for weather in Mission Viejo: highs near 76°F (24°C) and almost no rain.
Least pleasantFebruary and December are the least pleasant; February is the coldest, with highs of only 68°F (20°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in May.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Mission Viejo weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 68°F(20°C) | 45°F(7°C) | 2.3 in(58 mm) | 51% | 2.9 |
| FebFebruary | 68°F(20°C) | 46°F(8°C) | 2.7 in(69 mm) | 57% | 3.3 |
| MarMarch | 70°F(21°C) | 47°F(9°C) | 1.9 in(48 mm) | 59% | 4.8 |
| AprApril | 73°F(23°C) | 50°F(10°C) | 1.0 in(25 mm) | 59% | 5.9 |
| MayMayBest | 75°F(24°C) | 55°F(13°C) | 0.2 in(6 mm) | 63% | 6.2 |
| JunJuneBest | 78°F(26°C) | 58°F(15°C) | 0.1 in(2 mm) | 59% | 6.7 |
| JulJuly | 83°F(28°C) | 62°F(16°C) | 0.1 in(2 mm) | 59% | 6.7 |
| AugAugust | 85°F(29°C) | 62°F(17°C) | 0.0 in(1 mm) | 60% | 6.5 |
| SepSeptember | 84°F(29°C) | 61°F(16°C) | 0.2 in(5 mm) | 59% | 5.4 |
| OctOctober | 80°F(26°C) | 56°F(13°C) | 0.4 in(10 mm) | 52% | 4.1 |
| NovNovemberBest | 74°F(23°C) | 49°F(9°C) | 0.9 in(24 mm) | 49% | 3.3 |
| DecDecember | 68°F(20°C) | 44°F(7°C) | 2.1 in(53 mm) | 52% | 2.6 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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