Napa Weather Forecast
Napa weather: 59°F, mainly clear. Hourly forecast, 14-day outlook, UV, air quality and the best time to visit.
Napa weather in September
Weather map for Napa
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Animated layers by Windy. For pin-level detail and nearby places, see the interactive map below.
Climate in Napa month by month
Average high, average low and total rainfall, based on three years of reanalysis data.
| Month | Avg high | Avg low | Rainfall | Rating |
|---|---|---|---|---|
| January | 59° | 41° | 3,9 in | ★★★☆☆ |
| February | 60° | 43° | 7,4 in | ★★☆☆☆ |
| March | 65° | 45° | 3,5 in | ★★★★☆ |
| April | 68° | 46° | 2,2 in | ★★★★☆ |
| May | 76° | 51° | 0,6 in | ★★★★★ |
| June | 82° | 54° | 0,0 in | ★★★★★ |
| July | 85° | 56° | 0,0 in | ★★★★★ |
| August | 87° | 57° | 0,1 in | ★★★★★ |
| September | 82° | 56° | 0,3 in | ★★★★★ |
| October | 77° | 53° | 0,9 in | ★★★★★ |
| November | 65° | 46° | 4,4 in | ★★★☆☆ |
| December | 59° | 43° | 7,0 in | ★★☆☆☆ |
Climate type: Mediterranean. Source: Open-Meteo archive (ERA5).
Best time to visit Napa
Go in May, June, July, August and September. These months score highest on comfortable temperatures, low rainfall and useful daylight.
Hardest months: January, February and December - expect the least comfortable mix of heat, cold or rain.
What to pack, what to skip
- Lightweight, light-coloured clothing and a refillable water bottle
- Sunglasses, a brimmed hat and SPF 30+
- If your dates are flexible, avoid January, February and December - historically the least comfortable months here.
How Napa compares with nearby places
Annual averages, and the difference against Napa.
| Place | Distance | Avg temp | vs here | Annual rain |
|---|---|---|---|---|
| Alcatraz Island | 33 mi | 57°F | 34°F cooler | 25 in |
| Fisherman's Wharf | 35 mi | 57°F | 34°F cooler | 25 in |
| Golden Gate Bridge | 35 mi | 57°F | 34°F cooler | 25 in |
| ZIP Code 94133 | 35 mi | 57°F | 34°F cooler | 25 in |
| ZIP Code 94102 | 37 mi | 57°F | 34°F cooler | 25 in |
See the Napa forecast by time range
Napa weather - more answers
Explore Napa
Every topic we hold for this place, and the same topic for the places around it.
Weather for related places
Frequently asked questions
Where is Napa?
Napa is a city in California. Its coordinates are 38.2975, -122.2869. It lies in North America.
What is the weather like in Napa right now?
It is currently 59°F (15°C) with mainly clear. Humidity is 94% and wind is 4 mph.
When is the best time to visit Napa?
May, June, July, August and September offer the most comfortable conditions in Napa, which has a Mediterranean climate. January, February and December are usually the hardest months for outdoor plans.
What time zone is Napa in?
Napa observes America/Los_Angeles (UTC-07:00). The local time is 4:33 AM.
How many people live in Napa?
Napa has a population of approximately 80.000.
What is the nearest airport to Napa?
The closest airports are San Francisco International Airport (SFO), 47 mi away.
What are the top things to do in Napa?
Popular options include Alcatraz Island, Golden Gate Bridge, Point Lobos State Natural Reserve, Emerald Bay State Park, Lake Tahoe and Pinnacles National Park.
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| Place data | USPOTUS Atlas dataset (cities-us) - coordinates, hierarchy and facts. |
|---|---|
| Forecast and observations | Open-Meteo (ECMWF and national models). |
| Air quality and pollen | Copernicus CAMS via Open-Meteo. US AQI scale. |
| Climate averages | ERA5 reanalysis via the Open-Meteo archive, aggregated over 3 years. |
| Official alerts | US National Weather Service. |
| Method | Scores, comparisons and advice on this page are computed from the inputs above. Distances are straight-line. Nothing is estimated where data is missing - the block is simply not shown. |
Last updated August 25, 2026 at 4:33 AM local time. Live blocks refresh every 15 minutes; climate averages monthly.
