Monthly climate guide
Napa weather in March
With highs near 16°C (61°F) and lows around 6°C (42°F), March feels mild in Napa. Rainfall averages about 119 mm (wet) and the sky is often cloudy. Daytime highs are about the same as February and 3°C cooler than April.
What stands out in March
- Napa is usually about 2°C cooler than Sacramento, 80 km away, in March.
- It's one of the greyest months, with cloud cover near 55%.
- It's wetter than a typical month in Napa — roughly 127% more rain than average.
- Seasonally, March counts as early spring in Napa.
It's usually the wettest month of the year.
Avg high
16°C
61°F
Avg low
6°C
42°F
Rainfall
119 mm
wet
Humidity
81%
relative
Sky
55%
cloud · often cloudy
Napa weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 14°C / 56°F | 4°C / 39°F | 116 mm | 83% | 55% |
| February | 15°C / 58°F | 4°C / 40°F | 114 mm | 79% | 47% |
| March | 16°C / 61°F | 6°C / 42°F | 119 mm | 81% | 55% |
| April | 19°C / 67°F | 7°C / 45°F | 39 mm | 75% | 44% |
| May | 23°C / 74°F | 9°C / 48°F | 18 mm | 68% | 37% |
| June | 29°C / 85°F | 12°C / 54°F | 8 mm | 54% | 22% |
| July | 32°C / 89°F | 14°C / 56°F | 0 mm | 48% | 19% |
| August | 32°C / 90°F | 14°C / 57°F | 0 mm | 49% | 24% |
| September | 31°C / 87°F | 14°C / 57°F | 4 mm | 48% | 22% |
| October | 26°C / 79°F | 11°C / 52°F | 27 mm | 52% | 29% |
| November | 18°C / 65°F | 7°C / 44°F | 71 mm | 68% | 43% |
| December | 13°C / 56°F | 4°C / 39°F | 114 mm | 78% | 49% |
What to pack for March
- A warm sweater or fleece for layering
- A mid-weight jacket
- A compact umbrella or packable rain jacket
- Water-resistant shoes
Is March a good time to visit Napa?
Compare the months in the chart above to find your ideal window.
Best time to visit Napa →Other United States cities in March
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Napa weather in March. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/usa/napa/march
<a href="https://weathercompare.eu/weather/usa/napa/march">Napa weather in March</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/usa/napa" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Napa weather in March"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/usa/napa/march">Napa weather in March</a> – WeatherCompare</p>
Napa in March: quick answers
Is March a good time to visit Napa?
March is one of the wetter months in Napa, with about 119 mm of rain. You can still go: pack a rain jacket and keep plans flexible.
How warm is Napa in March?
Average highs are about 16°C (61°F) and average lows about 6°C (42°F), based on 10 years of daily data.
Does it rain a lot in Napa in March?
Napa typically gets around 119 mm of rain in March — wet. It's usually the wettest month of the year.
Figures are long-term averages for the area around Napa (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.