Montclair, California Climate by Month
Montclair, California, United States
Hot summers and mild winters, with most rain from December to March.
Montclair has hot summers and mild winters, with most rain from December to March. August is the warmest month, with highs around 92°F (33°C); December is the coolest at 67°F (20°C), and nights dip to 42°F (5°C). It gets 14 in (355 mm) of rain a year, 76% of it from December to March. May to September are almost completely dry.
- Warmest month
- 92°F(33°C)
- Average high, August
- Coldest nights
- 42°F(5°C)
- Average low, December
- Rain per year
- 14 in(355 mm)
- Wettest: February
- Humidity
- 48%
- Sunniest: June
Best and worst months in Montclair
Best for weatherThe most comfortable weather comes in April, May and November, with highs around 76°F (25°C) and about 0.9 in (22 mm) of rain a month.
Least pleasantJuly and August are the least pleasant; August is the hottest, with highs of 92°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)
Montclair weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 68°F(20°C) | 43°F(6°C) | 2.9 in(74 mm) | 47% | 2.9 |
| FebFebruary | 68°F(20°C) | 44°F(7°C) | 3.2 in(81 mm) | 52% | 3.4 |
| MarMarch | 71°F(22°C) | 47°F(8°C) | 2.1 in(54 mm) | 53% | 4.9 |
| AprAprilBest | 76°F(24°C) | 49°F(10°C) | 1.2 in(30 mm) | 47% | 5.9 |
| MayMayBest | 79°F(26°C) | 54°F(12°C) | 0.3 in(7 mm) | 50% | 6.5 |
| JunJune | 84°F(29°C) | 58°F(14°C) | 0.0 in(1 mm) | 50% | 7.0 |
| JulJuly | 90°F(32°C) | 62°F(17°C) | 0.0 in(1 mm) | 49% | 6.9 |
| AugAugust | 92°F(33°C) | 63°F(17°C) | 0.0 in(1 mm) | 47% | 6.7 |
| SepSeptember | 89°F(32°C) | 60°F(16°C) | 0.2 in(4 mm) | 44% | 5.6 |
| OctOctober | 82°F(28°C) | 54°F(12°C) | 0.5 in(12 mm) | 42% | 4.2 |
| NovNovemberBest | 74°F(24°C) | 47°F(8°C) | 1.2 in(30 mm) | 44% | 3.3 |
| DecDecember | 67°F(20°C) | 42°F(5°C) | 2.4 in(60 mm) | 48% | 2.6 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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