Napa County Weather in October
Average highs run from 83°F on October 1 to 72°F on October 31, and lows from 52°F to 47°F. Normal precipitation for the month is 1.65 in over about 3 wet days.
October day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
October at a glance
- Average high
- 78°F
- Average low
- 49°F
- Precipitation
- 1.65 in
- Record high
- 101°FOct 15, 2020
- Record low
- 30°FOct 31, 2002
- Chance of a freeze
- 2%
- Days of 90°F or more
- 3.2
- Daylight
- 11 h 47 min to 10 h 35 min
- Cloud cover
- 35%
- Humidity
- 54%
- Dew point
- 41°F
- Wind
- 6.5 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 |
|---|---|---|---|---|---|
| Oct 1 | 83°F | 52°F | 99°F 2024 | 38°F 2006 | 5% |
| Oct 2 | 83°F | 52°F | 100°F 2024 | 36°F 2019 | 5% |
| Oct 3 | 83°F | 52°F | 94°F 2014 | 38°F 2005 | 6% |
| Oct 4 | 82°F | 51°F | 94°F 2014 | 35°F 2009 | 6% |
| Oct 5 | 82°F | 51°F | 97°F 2024 | 36°F 2009 | 6% |
| Oct 6 | 82°F | 51°F | 99°F 2024 | 36°F 2007 | 7% |
| Oct 7 | 81°F | 51°F | 99°F 2024 | 37°F 2009 | 7% |
| Oct 8 | 81°F | 51°F | 91°F 2016 | 40°F 2010 | 7% |
| Oct 9 | 81°F | 51°F | 89°F 2015 | 37°F 2005 | 8% |
| Oct 10 | 80°F | 51°F | 92°F 1999 | 39°F 2001 | 8% |
| Oct 11 | 80°F | 50°F | 89°F 2004 | 36°F 2019 | 8% |
| Oct 12 | 80°F | 50°F | 95°F 2001 | 38°F 2002 | 9% |
| Oct 13 | 79°F | 50°F | 94°F 2010 | 35°F 2017 | 9% |
| Oct 14 | 79°F | 50°F | 94°F 2020 | 37°F 2013 | 10% |
| Oct 15 | 79°F | 50°F | 101°F 2020 | 37°F 2013 | 10% |
| Oct 16 | 78°F | 49°F | 97°F 2020 | 37°F 2019 | 10% |
| Oct 17 | 78°F | 49°F | 95°F 2020 | 37°F 2006 | 11% |
| Oct 18 | 78°F | 49°F | 91°F 2020 | 37°F 1998 | 11% |
| Oct 19 | 77°F | 49°F | 95°F 2023 | 37°F 2021 | 12% |
| Oct 20 | 77°F | 49°F | 87°F 2015 | 36°F 2008 | 12% |
| Oct 21 | 76°F | 49°F | 91°F 2019 | 35°F 2004 | 13% |
| Oct 22 | 76°F | 48°F | 87°F 2008 | 37°F 2008 | 13% |
| Oct 23 | 76°F | 48°F | 89°F 2019 | 37°F 1998 | 14% |
| Oct 24 | 75°F | 48°F | 93°F 2019 | 35°F 2001 | 14% |
| Oct 25 | 75°F | 48°F | 94°F 2003 | 36°F 2006 | 15% |
| Oct 26 | 74°F | 48°F | 91°F 2003 | 37°F 2010 | 16% |
| Oct 27 | 74°F | 48°F | 90°F 2003 | 32°F 2011 | 16% |
| Oct 28 | 74°F | 47°F | 88°F 2003 | 33°F 2004 | 17% |
| Oct 29 | 73°F | 47°F | 84°F 2015 | 34°F 2008 | 17% |
| Oct 30 | 73°F | 47°F | 82°F 2018 | 34°F 2002 | 18% |
| Oct 31 | 72°F | 47°F | 80°F 2018 | 30°F 2002 | 19% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (PDT).
- October 1
- sunrise 7:05 AM, sunset 6:52 PM
- October 31
- sunrise 7:35 AM, sunset 6:10 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.