Cupertino Climate by Month
Cupertino, California, United States
Warm summers and mild winters, with most rain from December to March.
The climate in Cupertino is one of warm summers and mild winters, with most rain from December to March. Afternoon highs range from 62°F (17°C) in January to 83°F (28°C) in August, and December nights average 41°F (5°C). It gets 19 in (485 mm) of rain a year, 71% of it from December to March. May to September are almost completely dry.
- Warmest month
- 83°F(28°C)
- Average high, August
- Coldest nights
- 41°F(5°C)
- Average low, December
- Rain per year
- 19 in(485 mm)
- Wettest: January
- Humidity
- 64%
- Sunniest: June
Best and worst months in Cupertino
Best for weatherMay is the best time for weather in Cupertino: highs near 76°F (24°C) and almost no rain.
Least pleasantDecember and January are the least pleasant; January is the coldest, with highs of only 62°F (17°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)
Cupertino weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 62°F(17°C) | 42°F(6°C) | 3.9 in(99 mm) | 76% | 2.0 |
| FebFebruary | 64°F(18°C) | 44°F(7°C) | 3.4 in(86 mm) | 71% | 2.7 |
| MarMarch | 67°F(20°C) | 45°F(7°C) | 2.9 in(73 mm) | 65% | 4.3 |
| AprApril | 71°F(22°C) | 46°F(8°C) | 1.6 in(40 mm) | 65% | 5.5 |
| MayMayBest | 76°F(24°C) | 51°F(11°C) | 0.4 in(9 mm) | 61% | 6.4 |
| JunJune | 80°F(27°C) | 55°F(13°C) | 0.1 in(2 mm) | 57% | 7.4 |
| JulJuly | 82°F(28°C) | 57°F(14°C) | 0.1 in(2 mm) | 57% | 7.2 |
| AugAugust | 83°F(28°C) | 58°F(14°C) | 0.0 in(1 mm) | 60% | 6.5 |
| SepSeptember | 82°F(28°C) | 55°F(13°C) | 0.1 in(2 mm) | 58% | 5.5 |
| OctOctober | 77°F(25°C) | 51°F(10°C) | 1.1 in(27 mm) | 59% | 3.9 |
| NovNovember | 68°F(20°C) | 45°F(7°C) | 2.2 in(56 mm) | 71% | 2.6 |
| DecDecember | 62°F(17°C) | 41°F(5°C) | 3.5 in(88 mm) | 69% | 1.8 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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