Simi Valley Climate by Month
Simi Valley, California, United States
Hot summers and mild winters, with most rain from December to March.
Simi Valley has hot summers and mild winters, with most rain from December to March. August is the warmest month, with highs around 90°F (32°C); February is the coolest at 67°F (19°C), and nights dip to 43°F (6°C). It gets 14 in (367 mm) of rain a year, 77% of it from December to March. May to September are almost completely dry.
- Warmest month
- 90°F(32°C)
- Average high, August
- Coldest nights
- 43°F(6°C)
- Average low, December
- Rain per year
- 14 in(367 mm)
- Wettest: February
- Humidity
- 52%
- Sunniest: June
Best and worst months in Simi Valley
Best for weatherThe most comfortable weather comes in May, with highs around 76°F (24°C) and almost no rain.
Least pleasantFebruary and August are the least pleasant; August is the hottest, with highs of 90°F (32°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in May.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Simi Valley weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 67°F(20°C) | 44°F(7°C) | 3.2 in(81 mm) | 53% | 2.7 |
| FebFebruary | 67°F(19°C) | 44°F(7°C) | 3.2 in(82 mm) | 54% | 3.4 |
| MarMarch | 69°F(21°C) | 45°F(7°C) | 2.2 in(55 mm) | 57% | 4.8 |
| AprApril | 73°F(23°C) | 47°F(8°C) | 1.1 in(27 mm) | 57% | 6.0 |
| MayMayBest | 76°F(24°C) | 51°F(11°C) | 0.2 in(5 mm) | 55% | 6.5 |
| JunJune | 80°F(27°C) | 55°F(13°C) | 0.0 in(1 mm) | 57% | 7.0 |
| JulJuly | 87°F(31°C) | 59°F(15°C) | 0.0 in(0 mm) | 54% | 6.8 |
| AugAugust | 90°F(32°C) | 60°F(16°C) | 0.0 in(0 mm) | 47% | 6.7 |
| SepSeptember | 88°F(31°C) | 58°F(14°C) | 0.1 in(3 mm) | 47% | 5.5 |
| OctOctober | 82°F(28°C) | 54°F(12°C) | 0.5 in(12 mm) | 47% | 4.1 |
| NovNovember | 74°F(24°C) | 48°F(9°C) | 1.5 in(38 mm) | 44% | 3.2 |
| DecDecember | 67°F(20°C) | 43°F(6°C) | 2.5 in(63 mm) | 47% | 2.5 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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