Climate averages 1991–2020
Irvine weather
in January.
A mild, moderately wet month: the joint 10th warmest and the 11th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
January is a mild month in Irvine: daytime highs average 18.3°C and nights cool to about 8.4°C. By daytime temperature it is the joint 10th warmest of the 12 months.
Expect about 79 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 11 min on an average January day.
The nearest other city in this atlas is Santa Ana, United States (9 km away). In January its highs average 17.4°C, 0.9°C cooler than Irvine, with 79 mm of rain.
Among the 498 cities listed in the United States, Irvine ranks joint 62nd of 498 for the warmest January highs and joint 265th of 498 for the driest January (rainfall, lowest first). The mean January high of those 498 cities is 9.5°C; Irvine is 8.9°C warmer than that mean.
From January to February, average highs stay level at 18.3°C, and monthly rainfall rises from 79 mm to 92 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
Irvine climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January, selected | 18.3°C8.4°C | 8.4°C | 79 | 5.7 | 10.210 h |
| February | 18.3°C9.1°C | 9.1°C | 92 | 6.4 | 11.011 h |
| March | 19.3°C10.4°C | 10.4°C | 56 | 6.0 | 12.012 h |
| April | 20.7°C11.8°C | 11.8°C | 23 | 3.1 | 13.013 h |
| May | 22.1°C13.8°C | 13.8°C | 9.3 | 1.7 | 13.914 h |
| June | 24.4°C15.7°C | 15.7°C | 2.0 | 0.3 | 14.314 h |
| July | 27.1°C18.0°C | 18.0°C | 1.6 | 0.5 | 14.214 h |
| August | 28.2°C18.9°C | 18.9°C | 0.9 | 0.2 | 13.413 h |
| September | 27.6°C18.3°C | 18.3°C | 4.3 | 0.8 | 12.412 h |
| October | 24.9°C15.4°C | 15.4°C | 17 | 2.2 | 11.411 h |
| November | 21.6°C11.6°C | 11.6°C | 24 | 2.6 | 10.510 h |
| December | 18.2°C8.4°C | 8.4°C | 55 | 5.0 | 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
- Santa Ana, United States in JanuaryUnited States · 9 kmHigh 17.4°C · Low 8.1°C · 79 mm rain
- Mission Viejo in JanuaryUnited States · 16 kmHigh 17.8°C · Low 8.4°C · 66 mm rain
- Huntington Beach in JanuaryUnited States · 16 kmHigh 17.4°C · Low 8.2°C · 71 mm rain
- Westminster (California), United States in JanuaryUnited States · 20 kmHigh 18.1°C · Low 7.1°C · 71 mm rain
- Anaheim in JanuaryUnited States · 20 kmHigh 18.1°C · Low 6.8°C · 71 mm rain
- Fullerton in JanuaryUnited States · 24 kmHigh 18.6°C · Low 6.7°C · 71 mm rain
- Buena Park in JanuaryUnited States · 27 kmHigh 18.7°C · Low 6.7°C · 71 mm rain
- Corona in JanuaryUnited States · 33 kmHigh 18.3°C · Low 5.8°C · 96 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 Irvine) is explained once on the Irvine year overview and on the Sources, method and limits page.
Santa Ana, United States lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.