Climate averages 1991–2020
Mission Viejo weather
in January.
A mild, moderately wet month: the 10th warmest and the 11th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
January is a mild month in Mission Viejo: daytime highs average 17.8°C and nights cool to about 8.4°C. By daytime temperature it is the 10th warmest of the 12 months.
Expect about 66 mm of rain on roughly 6 days, which makes January a moderately wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 10 h 12 min on an average January day.
The nearest other city in this atlas is Irvine (16 km away). In January its highs average 18.3°C, 0.5°C warmer than Mission Viejo, with 79 mm of rain.
Among the 498 cities listed in the United States, Mission Viejo ranks joint 75th of 498 for the warmest January highs and joint 197th of 498 for the driest January (rainfall, lowest first). The mean January high of those 498 cities is 9.5°C; Mission Viejo is 8.3°C warmer than that mean.
From January to February, average highs fall by 0.1°C to 17.7°C, and monthly rainfall rises from 66 mm to 79 mm.
The annual picture
January 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, selected | 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 | 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
January in nearby cities
- Irvine in JanuaryUnited States · 16 kmHigh 18.3°C · Low 8.4°C · 79 mm rain
- Santa Ana, United States in JanuaryUnited States · 24 kmHigh 17.4°C · Low 8.1°C · 79 mm rain
- Huntington Beach in JanuaryUnited States · 31 kmHigh 17.4°C · Low 8.2°C · 71 mm rain
- Corona in JanuaryUnited States · 32 kmHigh 18.3°C · Low 5.8°C · 96 mm rain
- Anaheim in JanuaryUnited States · 34 kmHigh 18.1°C · Low 6.8°C · 71 mm rain
- Westminster (California), United States in JanuaryUnited States · 36 kmHigh 18.1°C · Low 7.1°C · 71 mm rain
- Fullerton in JanuaryUnited States · 38 kmHigh 18.6°C · Low 6.7°C · 71 mm rain
- Buena Park in JanuaryUnited States · 42 kmHigh 18.7°C · Low 6.7°C · 71 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.