Climate averages 1991–2020
Mission Viejo weather
in August.
A warm, very dry month: the warmest and the driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
August is a warm month in Mission Viejo: daytime highs average 27.2°C and nights cool to about 18.5°C. By daytime temperature it is the warmest month of the year.
Rain is very rare: less than 1 mm falls in a typical August (the driest month of the year). Daylight, from sunrise to sunset, lasts about 13 h 24 min on an average August day.
The nearest other city in this atlas is Irvine (16 km away). In August its highs average 28.2°C, 1.1°C warmer than Mission Viejo, with almost no rain (under 1 mm).
Among the 498 cities listed in the United States, Mission Viejo ranks joint 369th of 498 for the warmest August highs and joint 36th of 498 for the driest August (rainfall, lowest first). The mean August high of those 498 cities is 29.9°C; Mission Viejo is 2.7°C cooler than that mean.
From August to September, average highs fall by 0.6°C to 26.6°C, and monthly rainfall rises from under 1 mm to 3.3 mm.
The annual picture
August in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Mission Viejo climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 17.8°C8.4°C | 8.4°C | 66 | 5.5 | 10.210 h |
| February | 17.7°C8.9°C | 8.9°C | 79 | 6.3 | 11.011 h |
| March | 18.5°C10.1°C | 10.1°C | 46 | 5.7 | 12.012 h |
| April | 19.8°C11.4°C | 11.4°C | 20 | 2.9 | 13.013 h |
| May | 21.0°C13.4°C | 13.4°C | 7.7 | 1.7 | 13.914 h |
| June | 23.4°C15.3°C | 15.3°C | 1.5 | 0.4 | 14.314 h |
| July | 26.1°C17.7°C | 17.7°C | 1.3 | 0.4 | 14.114 h |
| August, selected | 27.2°C18.5°C | 18.5°C | 0.8 | 0.2 | 13.413 h |
| September | 26.6°C17.9°C | 17.9°C | 3.3 | 0.6 | 12.412 h |
| October | 24.1°C15.1°C | 15.1°C | 15 | 2.0 | 11.411 h |
| November | 21.0°C11.6°C | 11.6°C | 21 | 2.7 | 10.510 h |
| December | 17.6°C8.5°C | 8.5°C | 48 | 4.9 | 10.010 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
August in nearby cities
- Irvine in AugustUnited States · 16 kmHigh 28.2°C · Low 18.9°C · 0.9 mm rain
- Santa Ana, United States in AugustUnited States · 24 kmHigh 26.7°C · Low 18.1°C · 0.9 mm rain
- Huntington Beach in AugustUnited States · 31 kmHigh 26.5°C · Low 18.1°C · 0.4 mm rain
- Corona in AugustUnited States · 32 kmHigh 33.2°C · Low 19.3°C · 1.1 mm rain
- Anaheim in AugustUnited States · 34 kmHigh 29.1°C · Low 17.9°C · 0.4 mm rain
- Westminster (California), United States in AugustUnited States · 36 kmHigh 28.6°C · Low 17.9°C · 0.4 mm rain
- Fullerton in AugustUnited States · 38 kmHigh 31.6°C · Low 18.7°C · 0.4 mm rain
- Buena Park in AugustUnited States · 42 kmHigh 31.2°C · Low 18.4°C · 0.4 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Mission Viejo) is explained once on the Mission Viejo year overview and on the Sources, method and limits page.