Napa weather in July
In July, Napa sees average daytime highs of 84°F and overnight lows near 57°F, with 0.0 in of rain across 0.1 wet days and about 14.4 hours of daylight. It is the 2nd-warmest and 12th-wettest month of the year here.
Day-to-day highs hold fairly steady near 84°F through the month. The sky is clear or mostly clear about 91% of the time in July, and the air most often feels dry.
Daylight stretches from about 14 h 36 min at the start of July to 14 hours by month's end. Set against the rest of the year, July is Napa's 1st-clearest and 2nd-windiest month. For the whole year in context, see Napa's year-round climate.
- Daytime high
- 84°
- 2nd warmest
- Overnight low
- 57°
- 11th coldest
- Rainfall
- 0.0 in
- 0.1 wet days
- Daylight
- 14 h 24 min
- 5:02 AM – 7:27 PM
- Cloud cover
- 10%
- 1st clearest
- Wind
- 6 mph
- 2nd windiest
- Solar energy
- 8.05 kWh/m²
- Travel score
- 7.6
- out of 10
Napa is city in Napa County, California, United States.
- Density
- 1,721/km²
- people per km²
- Founded
- 1872
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in July
Day-to-day highs hold fairly steady near 84°F through the month.
A typical July day in Napa reaches about 84°F in the afternoon and slips back to 57°F overnight — a 27°F spread between the day's warmth and the night's chill. On most days the high lands between 76°F and 93°F. Set against its neighbours, July runs about 2°F warmer than June and on par with August.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 84 | 84 | 84 | 84 | 84 | 84 | 84 | 84 | 84 | 84 | 84 | 84 | 84 | 84 | 84 | 84 | 84 | 84 | 84 | 84 | 84 | 84 | 84 | 84 | 84 | 84 | 84 | 84 | 84 | 84 | 84 |
| Avg low (°F) | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 |
| Avg high (°F) | Avg low (°F) | |
|---|---|---|
| 1 | 84 | 57 |
| 2 | 84 | 57 |
| 3 | 84 | 57 |
| 4 | 84 | 57 |
| 5 | 84 | 57 |
| 6 | 84 | 57 |
| 7 | 84 | 57 |
| 8 | 84 | 57 |
| 9 | 84 | 57 |
| 10 | 84 | 57 |
| 11 | 84 | 57 |
| 12 | 84 | 57 |
| 13 | 84 | 57 |
| 14 | 84 | 57 |
| 15 | 84 | 57 |
| 16 | 84 | 57 |
| 17 | 84 | 57 |
| 18 | 84 | 57 |
| 19 | 84 | 57 |
| 20 | 84 | 57 |
| 21 | 84 | 57 |
| 22 | 84 | 57 |
| 23 | 84 | 57 |
| 24 | 84 | 57 |
| 25 | 84 | 57 |
| 26 | 84 | 57 |
| 27 | 84 | 57 |
| 28 | 84 | 57 |
| 29 | 84 | 57 |
| 30 | 84 | 57 |
| 31 | 84 | 57 |
Napa weather by month
How July compares with the rest of the year at a glance. July is the 2nd-warmest and 12th-wettest month here — the current month is highlighted below.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 58° / 42° | 4.6 | 9.4 | 9.6 | 4.3 |
| Feb | 61° / 44° | 4.6 | 8.6 | 10.5 | 5.1 |
| Mar | 65° / 46° | 3.4 | 8.4 | 11.7 | 6.2 |
| Apr | 69° / 48° | 1.5 | 4.9 | 13 | 7.4 |
| May | 76° / 52° | 0.8 | 3.2 | 14 | 8.4 |
| Jun | 82° / 56° | 0.2 | 0.9 | 14.6 | 8.1 |
| Jul | 84° / 57° | 0.0 | 0.1 | 14.4 | 7.6 |
| Aug | 84° / 57° | 0.0 | 0.2 | 13.5 | 7.5 |
| Sep | 83° / 56° | 0.1 | 0.4 | 12.3 | 8.0 |
| Oct | 76° / 52° | 1.0 | 2.9 | 11 | 8.5 |
| Nov | 65° / 46° | 2.2 | 5.9 | 9.9 | 6.5 |
| Dec | 57° / 42° | 4.3 | 9.3 | 9.4 | 4.3 |
Cloud cover in July
The sky is clear or mostly clear about 91% of the time in July, the clearest month of the year.
Beyond those clear spells, partly cloudy skies cover about 3% of July, with mostly cloudy or overcast conditions the remaining 6%.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 92 | 92 | 94 | 94 | 95 | 95 | 95 | 95 | 95 | 95 | 95 | 95 | 95 | 95 | 95 | 95 | 95 | 94 | 94 | 94 | 94 | 94 | 94 | 94 | 94 | 94 | 94 | 94 | 95 | 95 | 95 |
| Cloudier (%) | 8 | 8 | 6 | 6 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 5 | 5 | 5 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 92 | 8 |
| 2 | 92 | 8 |
| 3 | 94 | 6 |
| 4 | 94 | 6 |
| 5 | 95 | 5 |
| 6 | 95 | 5 |
| 7 | 95 | 5 |
| 8 | 95 | 5 |
| 9 | 95 | 5 |
| 10 | 95 | 5 |
| 11 | 95 | 5 |
| 12 | 95 | 5 |
| 13 | 95 | 5 |
| 14 | 95 | 5 |
| 15 | 95 | 5 |
| 16 | 95 | 5 |
| 17 | 95 | 5 |
| 18 | 94 | 6 |
| 19 | 94 | 6 |
| 20 | 94 | 6 |
| 21 | 94 | 6 |
| 22 | 94 | 6 |
| 23 | 94 | 6 |
| 24 | 94 | 6 |
| 25 | 94 | 6 |
| 26 | 94 | 6 |
| 27 | 94 | 6 |
| 28 | 94 | 6 |
| 29 | 95 | 5 |
| 30 | 95 | 5 |
| 31 | 95 | 5 |
Chance of precipitation in July
Napa gets around 0.0 in of rain over 0.1 wet days in July, the driest month. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 1% and peaks near 1% on the wettest days.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Rain chance (%) | |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 1 |
| 7 | 1 |
| 8 | 0 |
| 9 | 0 |
| 10 | 0 |
| 11 | 0 |
| 12 | 1 |
| 13 | 1 |
| 14 | 1 |
| 15 | 1 |
| 16 | 1 |
| 17 | 1 |
| 18 | 1 |
| 19 | 1 |
| 20 | 1 |
| 21 | 0 |
| 22 | 0 |
| 23 | 0 |
| 24 | 0 |
| 25 | 0 |
| 26 | 0 |
| 27 | 0 |
| 28 | 0 |
| 29 | 0 |
| 30 | 0 |
| 31 | 0 |
Humidity in July
Most of July feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, July lands in the dry band about 76% of days. It rarely turns muggy — the humid and sticky bands barely register.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 82 | 82 | 82 | 82 | 82 | 82 | 81 | 81 | 80 | 80 | 79 | 78 | 77 | 75 | 74 | 73 | 72 | 72 | 71 | 71 | 71 | 71 | 71 | 71 | 71 | 71 | 71 | 71 | 71 | 71 | 72 |
| Comfortable (%) | 17 | 17 | 17 | 18 | 18 | 18 | 19 | 19 | 20 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 27 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 |
| Humid (%) | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 |
| Dry (%) | Comfortable (%) | Humid (%) | |
|---|---|---|---|
| 1 | 82 | 17 | 1 |
| 2 | 82 | 17 | 1 |
| 3 | 82 | 17 | 1 |
| 4 | 82 | 18 | 0 |
| 5 | 82 | 18 | 0 |
| 6 | 82 | 18 | 0 |
| 7 | 81 | 19 | 0 |
| 8 | 81 | 19 | 0 |
| 9 | 80 | 20 | 0 |
| 10 | 80 | 20 | 0 |
| 11 | 79 | 21 | 0 |
| 12 | 78 | 22 | 0 |
| 13 | 77 | 23 | 0 |
| 14 | 75 | 24 | 1 |
| 15 | 74 | 25 | 1 |
| 16 | 73 | 26 | 1 |
| 17 | 72 | 27 | 1 |
| 18 | 72 | 27 | 1 |
| 19 | 71 | 28 | 1 |
| 20 | 71 | 28 | 1 |
| 21 | 71 | 28 | 1 |
| 22 | 71 | 28 | 1 |
| 23 | 71 | 28 | 1 |
| 24 | 71 | 28 | 1 |
| 25 | 71 | 28 | 1 |
| 26 | 71 | 28 | 1 |
| 27 | 71 | 28 | 1 |
| 28 | 71 | 28 | 1 |
| 29 | 71 | 28 | 1 |
| 30 | 71 | 28 | 1 |
| 31 | 72 | 28 | 0 |
Wind in July
Winds average 6 mph in July.
Across July, daily wind ranges from about 6 mph on the calmest days to 6 mph at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (mph) | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (mph) | Feels | |
|---|---|---|
| 1 | 6 | calm |
| 2 | 6 | calm |
| 3 | 6 | calm |
| 4 | 6 | calm |
| 5 | 6 | calm |
| 6 | 6 | calm |
| 7 | 6 | calm |
| 8 | 6 | calm |
| 9 | 6 | calm |
| 10 | 6 | calm |
| 11 | 6 | calm |
| 12 | 6 | calm |
| 13 | 6 | calm |
| 14 | 6 | calm |
| 15 | 6 | calm |
| 16 | 6 | calm |
| 17 | 6 | calm |
| 18 | 6 | calm |
| 19 | 6 | calm |
| 20 | 6 | calm |
| 21 | 6 | calm |
| 22 | 6 | calm |
| 23 | 6 | calm |
| 24 | 6 | calm |
| 25 | 6 | calm |
| 26 | 6 | calm |
| 27 | 6 | calm |
| 28 | 6 | calm |
| 29 | 6 | calm |
| 30 | 6 | calm |
| 31 | 6 | calm |
Sunrise & sunset in July
Daylight runs from about 14 h 36 min at the start of July to 14 hours by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 36 minutes over July. Sunrise moves from 4:53 AM to 5:14 AM, and sunset from 7:32 PM to 7:16 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 14.6 | 14.6 | 14.6 | 14.6 | 14.6 | 14.6 | 14.6 | 14.6 | 14.5 | 14.5 | 14.5 | 14.5 | 14.5 | 14.5 | 14.4 | 14.4 | 14.4 | 14.4 | 14.4 | 14.3 | 14.3 | 14.3 | 14.3 | 14.2 | 14.2 | 14.2 | 14.2 | 14.1 | 14.1 | 14.1 | 14.0 |
| Sunrise (AM) | 4:53 | 4:54 | 4:54 | 4:55 | 4:55 | 4:56 | 4:56 | 4:57 | 4:57 | 4:58 | 4:59 | 4:59 | 5:00 | 5:01 | 5:01 | 5:02 | 5:03 | 5:04 | 5:04 | 5:05 | 5:06 | 5:07 | 5:07 | 5:08 | 5:09 | 5:10 | 5:11 | 5:11 | 5:12 | 5:13 | 5:14 |
| Sunset (PM) | 7:32 | 7:32 | 7:31 | 7:31 | 7:31 | 7:31 | 7:31 | 7:31 | 7:30 | 7:30 | 7:30 | 7:29 | 7:29 | 7:28 | 7:28 | 7:27 | 7:27 | 7:26 | 7:26 | 7:25 | 7:25 | 7:24 | 7:23 | 7:22 | 7:22 | 7:21 | 7:20 | 7:19 | 7:18 | 7:17 | 7:16 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 14.6 | 4:53 | 7:32 |
| 2 | 14.6 | 4:54 | 7:32 |
| 3 | 14.6 | 4:54 | 7:31 |
| 4 | 14.6 | 4:55 | 7:31 |
| 5 | 14.6 | 4:55 | 7:31 |
| 6 | 14.6 | 4:56 | 7:31 |
| 7 | 14.6 | 4:56 | 7:31 |
| 8 | 14.6 | 4:57 | 7:31 |
| 9 | 14.5 | 4:57 | 7:30 |
| 10 | 14.5 | 4:58 | 7:30 |
| 11 | 14.5 | 4:59 | 7:30 |
| 12 | 14.5 | 4:59 | 7:29 |
| 13 | 14.5 | 5:00 | 7:29 |
| 14 | 14.5 | 5:01 | 7:28 |
| 15 | 14.4 | 5:01 | 7:28 |
| 16 | 14.4 | 5:02 | 7:27 |
| 17 | 14.4 | 5:03 | 7:27 |
| 18 | 14.4 | 5:04 | 7:26 |
| 19 | 14.4 | 5:04 | 7:26 |
| 20 | 14.3 | 5:05 | 7:25 |
| 21 | 14.3 | 5:06 | 7:25 |
| 22 | 14.3 | 5:07 | 7:24 |
| 23 | 14.3 | 5:07 | 7:23 |
| 24 | 14.2 | 5:08 | 7:22 |
| 25 | 14.2 | 5:09 | 7:22 |
| 26 | 14.2 | 5:10 | 7:21 |
| 27 | 14.2 | 5:11 | 7:20 |
| 28 | 14.1 | 5:11 | 7:19 |
| 29 | 14.1 | 5:12 | 7:18 |
| 30 | 14.1 | 5:13 | 7:17 |
| 31 | 14.0 | 5:14 | 7:16 |
Solar energy in July
Average shortwave solar energy reaching the ground each day in July, about 8.05 kWh/m² — the sunniest month for solar.
For context, solar energy here swings from a low near 2.08 kWh/m² to a high of 8.05 kWh/m² in July across the year — July's 8.05 kWh/m² sits near the top of that range.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 8.2 | 8.2 | 8.2 | 8.2 | 8.2 | 8.2 | 8.2 | 8.2 | 8.2 | 8.1 | 8.1 | 8.1 | 8.1 | 8.1 | 8.1 | 8.0 | 8.0 | 8.0 | 8.0 | 8.0 | 7.9 | 7.9 | 7.9 | 7.9 | 7.9 | 7.8 | 7.8 | 7.8 | 7.8 | 7.8 | 7.7 |
| Level | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 8.2 | Intense |
| 2 | 8.2 | Intense |
| 3 | 8.2 | Intense |
| 4 | 8.2 | Intense |
| 5 | 8.2 | Intense |
| 6 | 8.2 | Intense |
| 7 | 8.2 | Intense |
| 8 | 8.2 | Intense |
| 9 | 8.2 | Intense |
| 10 | 8.1 | Intense |
| 11 | 8.1 | Intense |
| 12 | 8.1 | Intense |
| 13 | 8.1 | Intense |
| 14 | 8.1 | Intense |
| 15 | 8.1 | Intense |
| 16 | 8.0 | Intense |
| 17 | 8.0 | Intense |
| 18 | 8.0 | Intense |
| 19 | 8.0 | Intense |
| 20 | 8.0 | Intense |
| 21 | 7.9 | Intense |
| 22 | 7.9 | Intense |
| 23 | 7.9 | Intense |
| 24 | 7.9 | Intense |
| 25 | 7.9 | Intense |
| 26 | 7.8 | Intense |
| 27 | 7.8 | Intense |
| 28 | 7.8 | Intense |
| 29 | 7.8 | Intense |
| 30 | 7.8 | Intense |
| 31 | 7.7 | Intense |
Hazard calendar for Napa
None of Napa's seasonal hazards are active in July. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.
Napa's rainy season runs November–March, when most of the year's rain falls.
Is July a good time to visit Napa?
Our two travel scores rate July for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
July is one of the better times to visit Napa for general sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Napa in July
From July's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In July, Napa sees daytime highs around 84°F and nights near 57°F. Pack light clothes and sun protection.
Sea temperature near Napa in July
The nearest coast averages about 56°F in July — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 35 mi away) is warmest in September at about 58°F and coldest in April near 53°F.
The water stays below 68°F all year — cool enough that most swimmers want a wetsuit.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°F) | 53 | 53 | 54 | 53 | 53 | 54 | 56 | 58 | 58 | 57 | 55 | 54 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 53 | Bracing |
| Feb | 53 | Bracing |
| Mar | 54 | Bracing |
| Apr | 53 | Bracing |
| May | 53 | Bracing |
| Jun | 54 | Bracing |
| Jul | 56 | Bracing |
| Aug | 58 | Bracing |
| Sep | 58 | Bracing |
| Oct | 57 | Bracing |
| Nov | 55 | Bracing |
| Dec | 54 | Bracing |
UV index in Napa in July
Clear-sky midday UV in July peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Napa peaks around June 23 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 13 at about 2 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 4 | 5 | 6 | 9 | 10 | 10 | 9 | 6 | 5 | 2 | 2 |
| Level | Moderate | Moderate | Moderate | High | Very high | Extreme | Extreme | Very high | High | High | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Moderate |
| Feb | 4 | Moderate |
| Mar | 5 | Moderate |
| Apr | 6 | High |
| May | 9 | Very high |
| Jun | 10 | Extreme |
| Jul | 10 | Extreme |
| Aug | 9 | Very high |
| Sep | 6 | High |
| Oct | 5 | High |
| Nov | 2 | Moderate |
| Dec | 2 | Low |
Air quality in Napa in July
Average fine-particle pollution (PM2.5) through the year — so you can see where July falls, not just the annual average.
Air quality in Napa is worst in September — around 29 µg/m³ PM2.5 (moderate), about 4.2× the cleanest month (June, 7 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 13 | 13 | 13 | 10 | 8 | 7 | 10 | 25 | 29 | 27 | 16 | 12 |
| Level | Moderate | Moderate | Moderate | Good | Good | Good | Good | Moderate | Moderate | Moderate | Moderate | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 13 | Moderate |
| Feb | 13 | Moderate |
| Mar | 13 | Moderate |
| Apr | 10 | Good |
| May | 8 | Good |
| Jun | 7 | Good |
| Jul | 10 | Good |
| Aug | 25 | Moderate |
| Sep | 29 | Moderate |
| Oct | 27 | Moderate |
| Nov | 16 | Moderate |
| Dec | 12 | Good |
Where is Napa?
Napa sits at 38.3°N, 122.3°W, 20 ft above sea level, in United States. The nearest listed city is American Canyon, 8.7 mi away.
Topography around Napa
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Napa.
Within 2 miles, the terrain around Napa has only modest variations in elevation — a maximum elevation change of 492 ft around an average of 79 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 2,585 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 4,895 ft.
The land around Napa is covered by artificial surfaces (45%) and trees (33%) within 2 miles, trees (38%) and grassland (38%) within 10 miles, and trees (29%) and grassland (29%) within 50 miles.
United States travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 100% of US
- price level, 2025
- GDP per capita
- $90,027
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 5.8
- per 100k, 2023
- Road deaths
- 12.7
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Napa (38.2971°, -122.2855°, elevation 20 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).