Napa, CA weather in July
In July, Napa sees highs around 83°F and lows around 56°F: warm and dry. Rain is rare. Great for outdoor plans.
- Normal high
- 83°F
- Normal low
- 56°F
- Wet days
- 0
- 0.0 in total
- Muggy days
- 0
- dew point 65°F+
How July changes from start to finish
| July 1 | July 31 | |
|---|---|---|
| Normal high | 84°F | 83°F |
| Normal low | 55°F | 56°F |
| Chance of a wet day | 1% | 0% |
| Sunrise / sunset | 5:49 am / 8:36 pm | 6:10 am / 8:20 pm |
| Daylight | 14.8 h | 14.2 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Pacific Time).
A typical July day
- 6 am60°Fdew point 53°F
- 9 am71°Fdew point 54°F
- Noon83°Fdew point 54°F
- 3 pm88°Fdew point 53°F
- 6 pm79°Fdew point 54°F
- 9 pm66°Fdew point 53°F
NOAA hourly normals (local standard time) from Travis AFB (19 mi away); average wind 18 mph; clear or few clouds in 90% of daytime hours, mostly cloudy or overcast in 5%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F13 of 31
- Hot dayshigh 90°F or more6 of 31
- Muggy daysdaily mean dew point 65°F or more0 of 31
- Wet daysat least 0.01 in of rain or melted snow0 of 31
- Notable rainat least 0.10 in0 of 31
- Freezing nightslow 32°F or below0 of 31
Average days per July, counted from daily records for each year 1991-2020.
Rain in July
Normal precipitation is 0.0 in; a dry July brings about 0.0 in and a wet one about 0.0 in (25th and 75th percentiles). Days with half an inch or more are rare.
How July varies from year to year
- Warmest July, 1991-20202006: average high 88°F
- Coolest July1994: average high 79°F
- Wettest July2020: 0.0 in
- Driest July1991: no measurable precipitation
- Highest reading108°F (July 23, 2006)
- Lowest reading46°F (July 4, 1999)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
July compared with June and August
| June | July | August | |
|---|---|---|---|
| Normal high | 82°F | 83°F | 84°F |
| Normal low | 54°F | 56°F | 56°F |
| Wet days | 1 | 0 | 0 |
| Comfortable days | 13 | 13 | 13 |
| Daylight | 14.8 h | 14.5 h | 13.6 h |
Highs change by +1°F from June and +1°F into August.
Nearby alternatives in July
- Warmer: Fairfield, CA14 mi · high 90°F · 0 wet days
- Cooler: San Francisco, CA37 mi · high 66°F · 1 wet day
How Napa ranks in July
- Normal high271st warmest of 378 cities; 33rd of 60 in California
- Wet days5th driest of 378
- Comfortable days30th most of 340
What to pack for Napa in July
- Layers – afternoons near 83°F but nights near 56°F
- Sunglasses and sunscreen – about 14.5 hours of daylight and highs near 83°F
Heating and cooling
July has 5 heating degree days and 141 cooling degree days (base 65°F), 5% of the year's total heating and cooling demand.
Questions
How hot is Napa in July?
The normal high is 83°F and the normal low is 56°F. From 1991 to 2020 the hottest July reading was 108°F (July 23, 2006).
Does it rain a lot in Napa in July?
About 0 days in July have at least 0.01 in of precipitation, and the normal total is 0.00 in. The wettest July in 1991-2020 was in 2020 (0.00 in); the driest was in 1991, with no measurable precipitation.
Is July a good time to visit Napa?
July ranks 4th of 12 months on our comfort score for Napa (72 out of 100). It has about 13 comfortable days and about 6 days at 90°F or hotter. The best month is May.
Where the numbers come from
- Temperature, rain, snowfall and frost dates: Napa State Hospital (USC00046074), 1.8 mi SE of the city center, 35 ft . NOAA normals and daily records, 1991-2020.
- Snow depth: Fairfield (USC00042934), 12 mi E of the city center, 40 ft . NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour and cloud cover: Travis AFB (USW00023202), 19 mi E of the city center, 59 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Napa County Airport (724955-93227), 6.2 mi S of the city center, 15 ft . Hourly observations, 1991-2020.