Climate averages 1991–2020
Thousand Oaks weather
in January.
A mild, 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 Thousand Oaks: daytime highs average 17.6°C and nights cool to about 6.6°C. By daytime temperature it is the 10th warmest of the 12 months.
Expect about 91 mm of rain on roughly 6 days, which makes January a wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 10 h 09 min on an average January day.
The nearest other city in this atlas is Simi Valley (12 km away). In January its highs average 17.7°C, about as warm as Thousand Oaks, with 91 mm of rain.
Among the 498 cities listed in the United States, Thousand Oaks ranks joint 82nd of 498 for the warmest January highs and joint 358th of 498 for the driest January (rainfall, lowest first). The mean January high of those 498 cities is 9.5°C; Thousand Oaks is 8.1°C warmer than that mean.
From January to February, average highs stay level at 17.5°C, and monthly rainfall rises from 91 mm to 98 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
Thousand Oaks climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January, selected | 17.6°C6.6°C | 6.6°C | 91 | 5.6 | 10.210 h |
| February | 17.5°C6.9°C | 6.9°C | 98 | 6.4 | 10.911 h |
| March | 18.9°C8.3°C | 8.3°C | 66 | 5.6 | 11.912 h |
| April | 20.9°C10.0°C | 10.0°C | 22 | 2.9 | 13.013 h |
| May | 22.9°C12.9°C | 12.9°C | 12 | 1.8 | 13.914 h |
| June | 25.8°C15.6°C | 15.6°C | 2.0 | 0.5 | 14.414 h |
| July | 28.5°C18.4°C | 18.4°C | 3.1 | 0.5 | 14.214 h |
| August | 29.5°C19.1°C | 19.1°C | 0.3 | 0.1 | 13.413 h |
| September | 28.4°C17.7°C | 17.7°C | 3.9 | 0.6 | 12.412 h |
| October | 25.1°C14.1°C | 14.1°C | 20 | 2.1 | 11.411 h |
| November | 21.2°C9.8°C | 9.8°C | 21 | 2.6 | 10.410 h |
| December | 17.4°C6.5°C | 6.5°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
January in nearby cities
- Simi Valley in JanuaryUnited States · 12 kmHigh 17.7°C · Low 6.0°C · 91 mm rain
- Oxnard in JanuaryUnited States · 31 kmHigh 16.6°C · Low 8.9°C · 93 mm rain
- Santa Clarita in JanuaryUnited States · 37 kmHigh 16.9°C · Low 5.0°C · 70 mm rain
- Valencia, United States in JanuaryUnited States · 37 kmHigh 17.4°C · Low 5.1°C · 70 mm rain
- Ventura in JanuaryUnited States · 44 kmHigh 17.1°C · Low 7.4°C · 93 mm rain
- Burbank in JanuaryUnited States · 49 kmHigh 18.7°C · Low 6.6°C · 86 mm rain
- Inglewood in JanuaryUnited States · 50 kmHigh 18.6°C · Low 7.0°C · 80 mm rain
- Hawthorne in JanuaryUnited States · 53 kmHigh 18.4°C · Low 7.3°C · 80 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 Thousand Oaks) is explained once on the Thousand Oaks year overview and on the Sources, method and limits page.
Simi Valley lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.