Monthly climate guide
Napa weather in April
With highs near 19°C (67°F) and lows around 7°C (45°F), April feels mild in Napa. Rainfall averages about 39 mm (fairly dry) and the sky is a mix of sun and cloud. Daytime highs are 3°C warmer than March and 4°C cooler than May.
What stands out in April
- Afternoons and nights feel like different seasons, roughly 12°C apart.
- Just 60 km apart, but Napa runs about 2°C warmer than San Francisco this month.
- It warms up quickly from here: by May highs are about 4°C higher.
- In Napa, April is mid-spring.
Avg high
19°C
67°F
Avg low
7°C
45°F
Rainfall
39 mm
fairly dry
Humidity
75%
relative
Sky
44%
cloud · a mix of sun and cloud
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 April
- T-shirts plus a light layer for the evening
- Comfortable trainers or sandals for long walks
- An extra layer — evenings are noticeably cooler than afternoons
- A small travel umbrella, just in case
Is April 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 April
Cite or embed this data
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Napa weather in April. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/usa/napa/april
<a href="https://weathercompare.eu/weather/usa/napa/april">Napa weather in April</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 April"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/usa/napa/april">Napa weather in April</a> – WeatherCompare</p>
Napa in April: quick answers
Is April a good time to visit Napa?
Yes. April is one of the best months for Napa, with highs around 19°C and about 39 mm of rain.
How warm is Napa in April?
Average highs are about 19°C (67°F) and average lows about 7°C (45°F), based on 10 years of daily data.
Does it rain a lot in Napa in April?
Napa typically gets around 39 mm of rain in April — fairly dry.
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.