Napa weather in July
July in Napa: hot, dry, with clean air — an excellent time to visit.
#5 of 12 months in Napa · #135 of 604 destinations to visit in July · comfort 88/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Napa climate normals — July
| Daytime high | 32°C / 89°F | 🥵 hot |
|---|---|---|
| Nighttime low | 15°C / 58°F | |
| Feels like (high) | 32°C / 90°F | |
| Rainfall | 0 mm / 0 in | ☀️ dry |
| Rainy days | 0 days | |
| Humidity | 59% | 🍃 comfortable |
| Dew point | 12°C / 54°F | |
| Sunshine | 13.3 h/day | |
| Daylight | 14.5 h | |
| Wind | 16 km/h / 10 mph | |
| Air quality (US AQI) | 36 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Napa in July — FAQ
- Is July a good time to visit Napa?
- July in Napa: hot, dry, with clean air — an excellent time to visit. It ranks #5 of 12 months for Napa on SeasonMap's comfort score (88/100).
- What is the weather like in Napa in July?
- In July, Napa averages a daily high of 31.8°C and a low of 14.7°C, with about 0.3 mm of rain over roughly 0 rainy days.
- What is the air quality in Napa in July?
- Napa has a mean US Air Quality Index of about 36 in July.