NWS, American, European side by side around Napa and nearby towns.Live rain radar →
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Next 14 hours
consensus of the three models
7-day forecast
where the models agree, and where they split
Napa, CA is at its warmest in Jul (average highs near 90°F) and coldest in Feb (lows around 39°F), with roughly 39 in of precipitation across the year. Below, compare what NWS, American, European forecast for Napa right now, and see exactly where they disagree.
Napa climate by month
average daytime high and overnight low across a typical year
Jan
58°
42°
Feb
58°
39°
Mar
59°
42°
Apr
68°
44°
May
74°
50°
Jun
81°
54°
Jul
90°
57°
Aug
87°
57°
Sep
82°
55°
Oct
80°
53°
Nov
65°
44°
Dec
60°
43°
Common questions
What's the weather in Napa today?
On this page we show what NWS, American, European each forecast for Napa today, side by side and updated live. When all three agree the forecast is reliable; when they split, we flag it so you know the day is genuinely less certain.
Will it rain in Napa today or tomorrow?
Check the hourly strip and 7-day forecast above. We compare rain from NWS, American, European for Napa and flag the days where the models disagree on whether showers actually arrive, which is exactly when a single app can catch you out.
Which forecast is most accurate for Napa?
No single model is always right. NWS, American, European each run their own physics, so we line all three up: when they agree the Napa forecast is reliable, and when they split you should expect surprises. See our tested US accuracy scoreboard for how the models compare.
What is the warmest month in Napa?
Jul is typically the warmest month in Napa, with average highs around 90°F.
How cold does Napa get?
The coldest month in Napa is Feb, when overnight lows average about 39°F.
How much rain does Napa get?
Napa sees roughly 39 in of precipitation a year, with Jan usually the wettest month.
The forecasts Americans check
The two biggest apps keep their model a secret, so we can't show their numbers, only link you to them. The National Weather Service is public, so its data sits right in the comparison above.