Climate averages 1991–2020
Simi Valley weather
in October.
A warm, fairly dry month: the 5th 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 Simi Valley: daytime highs average 25.8°C and nights cool to about 13.7°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 20 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 21 min on an average October day.
The nearest other city in this atlas is Thousand Oaks (12 km away). In October its highs average 25.1°C, 0.7°C cooler than Simi Valley, with 20 mm of rain.
Among the 498 cities listed in the United States, Simi Valley ranks joint 110th of 498 for the warmest October highs and joint 68th of 498 for the driest October (rainfall, lowest first). The mean October high of those 498 cities is 21.4°C; Simi Valley is 4.5°C warmer than that mean.
From October to November, average highs fall by 4.4°C to 21.5°C, and monthly rainfall rises from 20 mm to 21 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
Simi Valley climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 17.7°C6.0°C | 6.0°C | 91 | 5.6 | 10.110 h |
| February | 17.8°C6.4°C | 6.4°C | 98 | 6.4 | 10.911 h |
| March | 19.5°C7.9°C | 7.9°C | 66 | 5.6 | 11.912 h |
| April | 21.7°C9.7°C | 9.7°C | 22 | 2.9 | 13.013 h |
| May | 23.9°C12.7°C | 12.7°C | 12 | 1.8 | 13.914 h |
| June | 26.8°C15.6°C | 15.6°C | 2.0 | 0.5 | 14.414 h |
| July | 29.6°C18.7°C | 18.7°C | 3.1 | 0.5 | 14.214 h |
| August | 30.7°C19.3°C | 19.3°C | 0.3 | 0.1 | 13.413 h |
| September | 29.5°C17.6°C | 17.6°C | 3.9 | 0.6 | 12.412 h |
| October, selected | 25.8°C13.7°C | 13.7°C | 20 | 2.1 | 11.411 h |
| November | 21.5°C9.2°C | 9.2°C | 21 | 2.6 | 10.410 h |
| December | 17.4°C5.9°C | 5.9°C | 58 | 4.8 | 9.910 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
- Thousand Oaks in OctoberUnited States · 12 kmHigh 25.1°C · Low 14.1°C · 20 mm rain
- Valencia, United States in OctoberUnited States · 25 kmHigh 26.7°C · Low 13.0°C · 16 mm rain
- Santa Clarita in OctoberUnited States · 26 kmHigh 26.4°C · Low 13.0°C · 16 mm rain
- Oxnard in OctoberUnited States · 37 kmHigh 22.4°C · Low 15.0°C · 18 mm rain
- Burbank in OctoberUnited States · 45 kmHigh 27.5°C · Low 14.1°C · 18 mm rain
- Ventura in OctoberUnited States · 47 kmHigh 23.6°C · Low 14.2°C · 18 mm rain
- Glendale (California), United States in OctoberUnited States · 50 kmHigh 26.7°C · Low 13.4°C · 18 mm rain
- Inglewood in OctoberUnited States · 52 kmHigh 25.9°C · Low 14.2°C · 15 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 Simi Valley) is explained once on the Simi Valley year overview and on the Sources, method and limits page.
Thousand Oaks lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.