Region in California, United States
Napa Valley weather by month and the best time to visit
When to go to Napa Valley
Apr–May is green and mild. Sep–Oct is harvest season, warm and busy. Winter is quiet and cooler; smoke from wildfires is possible late summer to fall.
Napa Valley weather by month
Average daily high, rainfall and conditions.
- Jan14°120 mm
- Feb15°123 mm
- Mar17°97 mm
- Apr20°46 mm
- May24°22 mm
- Jun30°6 mm
- Jul33°1 mm
- Aug33°1 mm
- Sep31°3 mm
- Oct26°34 mm
- Nov19°72 mm
- Dec14°163 mm
Monthly averages
| Month | High | Low | Rain | Humidity | Conditions |
|---|---|---|---|---|---|
| January | 14°C57°F | 5°C40°F | 120 mm | 84% | Cool |
| February | 15°C59°F | 5°C42°F | 123 mm | 82% | Cool |
| March | 17°C63°F | 7°C44°F | 97 mm | 81% | Cool |
| April | 20°C68°F | 8°C46°F | 46 mm | 76% | Pleasant |
| May | 24°C76°F | 10°C50°F | 22 mm | 69% | Pleasant |
| June | 30°C86°F | 13°C56°F | 6 mm | 56% | Pleasant |
| July | 33°C92°F | 15°C59°F | 1 mm | 49% | Hot |
| August | 33°C91°F | 15°C58°F | 1 mm | 49% | Hot |
| September | 31°C88°F | 14°C57°F | 3 mm | 47% | Pleasant |
| October | 26°C78°F | 11°C52°F | 34 mm | 54% | Pleasant |
| November | 19°C65°F | 7°C45°F | 72 mm | 70% | Pleasant |
| December | 14°C57°F | 5°C40°F | 163 mm | 82% | Rainy |
Best months across United States
| Place | Best months | Warmest month |
|---|---|---|
| New York City | Apr–Jun, Sep–Oct | Jul (26°C) |
| Las Vegas | Mar–May, Oct–Nov | Jul (42°C) |
| Los Angeles | Mar–May, Sep–Nov | Aug (32°C) |
| Orlando | Feb–Apr, Nov | May (31°C) |
| Miami | Nov–Apr | Aug (30°C) |
| San Francisco | Apr–May, Sep–Oct | Sep (24°C) |
| Honolulu | Apr–Jun, Sep–Oct | Sep (28°C) |
| Washington, D.C. | Mar–May, Sep–Oct | Jul (31°C) |
| Chicago | May–Jun, Sep–Oct | Jul (25°C) |
| Boston | May–Jun, Sep–Oct | Jul (28°C) |
| New Orleans | Feb–Apr, Oct–Nov | Jul (30°C) |
| San Diego | Apr–May, Sep–Nov | Aug (32°C) |
| Seattle | Jun–Sep | Aug (24°C) |
| Maui | Apr–May, Sep–Oct | Sep (22°C) |
| Nashville | Apr–May, Sep–Oct | Aug (32°C) |
| Austin | Mar–May, Oct–Nov | Aug (36°C) |
| Miami Beach | Nov–Apr | Aug (30°C) |
| Key West | Dec–Apr | Aug (30°C) |
| Denver | May–Jun, Sep–Oct | Jul (33°C) |
| Philadelphia | Apr–May, Sep–Oct | Jul (30°C) |
| Portland | Jun–Sep | Aug (29°C) |
| Atlanta | Mar–May, Oct–Nov | Jul (32°C) |
| San Antonio | Mar–May, Oct–Nov | Aug (36°C) |
| Charleston | Mar–May, Oct–Nov | Jul (32°C) |
| Savannah | Mar–May, Oct–Nov | Jul (33°C) |
| Fort Lauderdale | Dec–Apr | Aug (30°C) |
| Kauai | Apr–Jun, Sep–Oct | Sep (27°C) |
| Big Island | Apr–Jun, Sep–Oct | Aug (26°C) |
| Sedona | Mar–May, Sep–Nov | Jul (35°C) |
| Napa Valley | Apr–May, Sep–Oct | Jul (33°C) |
Quick answers
What is the best month to visit Napa Valley?
Apr–May, Sep–Oct. Apr–May is green and mild. Sep–Oct is harvest season, warm and busy. Winter is quiet and cooler; smoke from wildfires is possible late summer to fall.
When is the rainy season in Napa Valley?
Rain peaks in December with about 163 mm. Months with 150 mm or more: Dec.
What is the hottest month in Napa Valley?
July, with average highs of 33°C (92°F).
How cold does Napa Valley get?
The coolest nights are in January, averaging 5°C (40°F).
More about Napa Valley
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Sources
Climate averages are modelled from NASA POWER (MERRA-2) for 2001–2020 at about 50 km resolution, so coasts and valleys can differ a little. Temperatures are adjusted by 1.7°C for the city's elevation. Compiled and reviewed by SoloSquare. How we compile and score this. Spotted something out of date? Tell us.