Climate averages 1991–2020
Irvine weather
in October.
A warm, fairly dry month: the 4th warmest and the 6th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
October is a warm month in Irvine: daytime highs average 24.9°C and nights cool to about 15.4°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 17 mm of rain on roughly 2 days, which makes October a fairly dry month (the 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 22 min on an average October day.
The nearest other city in this atlas is Santa Ana, United States (9 km away). In October its highs average 23.7°C, 1.2°C cooler than Irvine, with 17 mm of rain.
Among the 498 cities listed in the United States, Irvine ranks joint 158th of 498 for the warmest October highs and joint 38th of 498 for the driest October (rainfall, lowest first). The mean October high of those 498 cities is 21.4°C; Irvine is 3.5°C warmer than that mean.
From October to November, average highs fall by 3.3°C to 21.6°C, and monthly rainfall rises from 17 mm to 24 mm.
The annual picture
October 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 | 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, selected | 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
October in nearby cities
- Santa Ana, United States in OctoberUnited States · 9 kmHigh 23.7°C · Low 15.0°C · 17 mm rain
- Mission Viejo in OctoberUnited States · 16 kmHigh 24.1°C · Low 15.1°C · 15 mm rain
- Huntington Beach in OctoberUnited States · 16 kmHigh 23.6°C · Low 15.1°C · 14 mm rain
- Westminster (California), United States in OctoberUnited States · 20 kmHigh 24.9°C · Low 14.6°C · 14 mm rain
- Anaheim in OctoberUnited States · 20 kmHigh 25.2°C · Low 14.3°C · 14 mm rain
- Fullerton in OctoberUnited States · 24 kmHigh 26.6°C · Low 14.4°C · 14 mm rain
- Buena Park in OctoberUnited States · 27 kmHigh 26.4°C · Low 14.4°C · 14 mm rain
- Corona in OctoberUnited States · 33 kmHigh 27.0°C · Low 13.7°C · 22 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.