Sunnyvale Climate by Month
Sunnyvale, California, United States
Warm summers and mild winters, with most rain from December to March.
The climate in Sunnyvale is one of warm summers and mild winters, with most rain from December to March. August is the warmest month, with highs around 82°F (28°C); January is the coolest at 62°F (16°C), and nights dip to 42°F (5°C). It gets 17 in (426 mm) of rain a year, 70% of it from December to March. May to September are almost completely dry.
- Warmest month
- 82°F(28°C)
- Average high, August
- Coldest nights
- 42°F(5°C)
- Average low, December
- Rain per year
- 17 in(426 mm)
- Wettest: January
- Humidity
- 64%
- Sunniest: June
Best and worst months in Sunnyvale
Best for weatherMay is the best time for weather in Sunnyvale: highs near 75°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 (16°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)
Sunnyvale weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 62°F(16°C) | 42°F(6°C) | 3.3 in(85 mm) | 76% | 1.9 |
| FebFebruary | 64°F(18°C) | 44°F(7°C) | 2.9 in(74 mm) | 70% | 2.7 |
| MarMarch | 67°F(20°C) | 46°F(8°C) | 2.6 in(65 mm) | 70% | 4.3 |
| AprApril | 71°F(22°C) | 47°F(8°C) | 1.5 in(37 mm) | 64% | 5.5 |
| MayMayBest | 75°F(24°C) | 52°F(11°C) | 0.4 in(9 mm) | 60% | 6.4 |
| JunJune | 80°F(27°C) | 55°F(13°C) | 0.1 in(2 mm) | 56% | 7.4 |
| JulJuly | 82°F(28°C) | 58°F(14°C) | 0.0 in(1 mm) | 61% | 7.2 |
| AugAugust | 82°F(28°C) | 58°F(14°C) | 0.0 in(1 mm) | 60% | 6.6 |
| SepSeptember | 82°F(28°C) | 56°F(13°C) | 0.1 in(2 mm) | 58% | 5.4 |
| OctOctober | 77°F(25°C) | 51°F(11°C) | 1.0 in(25 mm) | 58% | 3.9 |
| NovNovember | 68°F(20°C) | 45°F(7°C) | 1.9 in(49 mm) | 70% | 2.6 |
| DecDecember | 62°F(17°C) | 42°F(5°C) | 3.0 in(76 mm) | 69% | 1.8 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
Places with a similar climate
All 20 places like Sunnyvale →- 🇺🇸HollisterCalifornia, United States · Pop. 37k98%matchSame sunshineSame humiditySunnyvale vs Hollister →
- 🇺🇸SoledadCalifornia, United States · Pop. 25k96%matchSame summer highsSame humiditySunnyvale vs Soledad →
- 🇺🇸VallejoCalifornia, United States · Pop. 122k94%matchSame humiditySame sunshineSunnyvale vs Vallejo →
- 🇺🇸San Luis ObispoCalifornia, United States · Pop. 47k93%matchSame winter lowsSame humiditySunnyvale vs San Luis Obispo →
- 🇨🇱Melipilla↻Seasons flipped. Santiago Metropolitan, Chile · Pop. 63k91%matchSame summer highsSame winter lowsSunnyvale vs Melipilla →