Pasadena, California Climate by Month
Pasadena, California, United States
Hot summers and mild winters, with most rain from December to March.
The climate in Pasadena is one of hot summers and mild winters, with most rain from December to March. Afternoon highs range from 68°F (20°C) in December to 91°F (33°C) in August, and December nights average 43°F (6°C). Of the 17 in (434 mm) of rain in a typical year, 79% falls from December to March. May to September are almost completely dry.
- Warmest month
- 91°F(33°C)
- Average high, August
- Coldest nights
- 43°F(6°C)
- Average low, December
- Rain per year
- 17 in(434 mm)
- Wettest: February
- Humidity
- 49%
- Sunniest: June
Best and worst months in Pasadena
Best for weatherThe most comfortable weather comes in April, May and November, with highs around 76°F (24°C) and about 0.9 in (22 mm) of rain a month.
Least pleasantFebruary and August are the least pleasant; August is the hottest, with highs of 91°F (33°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 April.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Pasadena weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 69°F(21°C) | 44°F(7°C) | 3.7 in(95 mm) | 45% | 2.8 |
| FebFebruary | 69°F(21°C) | 45°F(7°C) | 4.2 in(107 mm) | 51% | 3.4 |
| MarMarch | 72°F(22°C) | 47°F(8°C) | 3.0 in(75 mm) | 52% | 4.8 |
| AprAprilBest | 75°F(24°C) | 50°F(10°C) | 1.1 in(29 mm) | 52% | 5.9 |
| MayMayBest | 78°F(25°C) | 54°F(12°C) | 0.4 in(9 mm) | 55% | 6.4 |
| JunJune | 82°F(28°C) | 58°F(14°C) | 0.1 in(3 mm) | 52% | 6.9 |
| JulJuly | 89°F(31°C) | 62°F(16°C) | 0.1 in(2 mm) | 51% | 6.8 |
| AugAugust | 91°F(33°C) | 62°F(17°C) | 0.0 in(1 mm) | 48% | 6.6 |
| SepSeptember | 88°F(31°C) | 60°F(16°C) | 0.2 in(4 mm) | 45% | 5.5 |
| OctOctober | 82°F(28°C) | 55°F(13°C) | 0.6 in(16 mm) | 47% | 4.1 |
| NovNovemberBest | 74°F(23°C) | 48°F(9°C) | 1.1 in(28 mm) | 44% | 3.3 |
| DecDecember | 68°F(20°C) | 43°F(6°C) | 2.6 in(65 mm) | 46% | 2.6 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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