Napa weather in January
January in Napa: cool, rainy, with clean air — a great time to visit.
#11 of 12 months in Napa · #285 of 604 destinations to visit in January · comfort 70/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Napa climate normals — January
| Daytime high | 16°C / 60°F | 🙂 cool |
|---|---|---|
| Nighttime low | 6°C / 43°F | |
| Feels like (high) | 14°C / 57°F | |
| Rainfall | 117 mm / 4.6 in | 🌧 rainy |
| Rainy days | 9 days | |
| Humidity | 77% | 💦 very humid |
| Dew point | 5°C / 42°F | |
| Sunshine | 6.6 h/day | |
| Daylight | 9.8 h | |
| Wind | 13 km/h / 8 mph | |
| Air quality (US AQI) | 32 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Napa in January — FAQ
- Is January a good time to visit Napa?
- January in Napa: cool, rainy, with clean air — a great time to visit. It ranks #11 of 12 months for Napa on SeasonMap's comfort score (70/100).
- What is the weather like in Napa in January?
- In January, Napa averages a daily high of 15.5°C and a low of 6.2°C, with about 116.6 mm of rain over roughly 9.4 rainy days.
- What is the air quality in Napa in January?
- Napa has a mean US Air Quality Index of about 32 in January.