Napa weather in March
March in Napa: nice, rainy, with clean air — an excellent time to visit.
#9 of 12 months in Napa · #222 of 604 destinations to visit in March · comfort 80/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Napa climate normals — March
| Daytime high | 18°C / 64°F | 😎 nice |
|---|---|---|
| Nighttime low | 7°C / 44°F | |
| Feels like (high) | 16°C / 61°F | |
| Rainfall | 97 mm / 3.8 in | 🌧 rainy |
| Rainy days | 10 days | |
| Humidity | 72% | 💧 humid |
| Dew point | 6°C / 42°F | |
| Sunshine | 9.2 h/day | |
| Daylight | 12 h | |
| Wind | 15 km/h / 9 mph | |
| Air quality (US AQI) | 37 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Napa in March — FAQ
- Is March a good time to visit Napa?
- March in Napa: nice, rainy, with clean air — an excellent time to visit. It ranks #9 of 12 months for Napa on SeasonMap's comfort score (80/100).
- What is the weather like in Napa in March?
- In March, Napa averages a daily high of 18°C and a low of 6.9°C, with about 96.6 mm of rain over roughly 10.4 rainy days.
- What is the air quality in Napa in March?
- Napa has a mean US Air Quality Index of about 37 in March.