Napa County Weather in July
Average highs run from 88°F on July 1 to 89°F on July 31, and lows from 56°F to 56°F. Normal precipitation for the month is 0.01 in over about 0 wet days.
July day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
July at a glance
- Average high
- 89°F
- Average low
- 56°F
- Precipitation
- 0.01 in
- Record high
- 106°FJul 22, 2006
- Record low
- 43°FJul 1, 2007
- Chance of a freeze
- 0%
- Days of 90°F or more
- 13.3
- Daylight
- 14 h 48 min to 14 h 09 min
- Cloud cover
- 27%
- Humidity
- 49%
- Dew point
- 47°F
- Wind
- 6.9 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Jul 1 | 88°F | 56°F | 91°F 2013 | 43°F 2007 | 2% |
| Jul 2 | 88°F | 56°F | 102°F 2024 | 46°F 2003 | 2% |
| Jul 3 | 88°F | 56°F | 99°F 2001 | 45°F 2003 | 2% |
| Jul 4 | 89°F | 56°F | 93°F 2007 | 45°F 1999 | 1% |
| Jul 5 | 89°F | 56°F | 89°F 2007 | 44°F 2025 | 1% |
| Jul 6 | 89°F | 56°F | 93°F 2018 | 47°F 2014 | 1% |
| Jul 7 | 89°F | 56°F | 100°F 2017 | 44°F 1999 | 1% |
| Jul 8 | 89°F | 56°F | 100°F 2008 | 44°F 2003 | 1% |
| Jul 9 | 89°F | 56°F | 100°F 2002 | 45°F 2003 | 1% |
| Jul 10 | 89°F | 56°F | 92°F 2002 | 46°F 2016 | 1% |
| Jul 11 | 89°F | 56°F | 97°F 1999 | 46°F 1998 | 1% |
| Jul 12 | 89°F | 56°F | 95°F 1999 | 46°F 2004 | 1% |
| Jul 13 | 89°F | 56°F | 96°F 2009 | 47°F 2009 | 1% |
| Jul 14 | 89°F | 56°F | 95°F 2009 | 47°F 2011 | 1% |
| Jul 15 | 89°F | 56°F | 96°F 1998 | 44°F 2004 | 1% |
| Jul 16 | 89°F | 56°F | 103°F 2017 | 48°F 2009 | 1% |
| Jul 17 | 89°F | 56°F | 99°F 2003 | 47°F 2009 | 1% |
| Jul 18 | 89°F | 56°F | 95°F 1998 | 50°F 2009 | 1% |
| Jul 19 | 89°F | 56°F | 97°F 2024 | 47°F 2000 | 1% |
| Jul 20 | 89°F | 56°F | 89°F 2011 | 47°F 2016 | 1% |
| Jul 21 | 89°F | 56°F | 94°F 2012 | 48°F 2001 | 1% |
| Jul 22 | 89°F | 56°F | 106°F 2006 | 44°F 2016 | 1% |
| Jul 23 | 89°F | 56°F | 102°F 2006 | 48°F 2000 | 1% |
| Jul 24 | 89°F | 56°F | 93°F 2006 | 45°F 2002 | 1% |
| Jul 25 | 89°F | 56°F | 98°F 2014 | 47°F 2008 | 1% |
| Jul 26 | 89°F | 56°F | 93°F 2008 | 48°F 2016 | 1% |
| Jul 27 | 89°F | 56°F | 89°F 2015 | 49°F 2000 | 0% |
| Jul 28 | 89°F | 56°F | 96°F 2015 | 49°F 2016 | 0% |
| Jul 29 | 89°F | 56°F | 85°F 2015 | 49°F 2010 | 0% |
| Jul 30 | 89°F | 56°F | 88°F 2012 | 46°F 2017 | 0% |
| Jul 31 | 89°F | 56°F | 91°F 2000 | 45°F 2005 | 0% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (PDT).
- July 1
- sunrise 5:49 AM, sunset 8:37 PM
- July 31
- sunrise 6:11 AM, sunset 8:20 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00047643 (Saint Helena), public domain. Records: NOAA GHCN-Daily, station USW00093227, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.