Marin County Weather in October
Average highs run from 79°F on October 1 to 70°F on October 31, and lows from 53°F to 49°F. Normal precipitation for the month is 1.46 in over about 4 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
- 75°F
- Average low
- 51°F
- Precipitation
- 1.46 in
- Record high
- 106°FOct 2, 1980
- Record low
- 25°FOct 30, 1948
- Chance of a freeze
- 0%
- Days of 90°F or more
- 1.2
- Daylight
- 11 h 47 min to 10 h 37 min
- Cloud cover
- 35%
- Humidity
- 69%
- Dew point
- 48°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 |
|---|---|---|---|---|---|
| Oct 1 | 79°F | 53°F | 103°F 1980 | 37°F 1925 | 7% |
| Oct 2 | 79°F | 53°F | 106°F 1980 | 38°F 1917 | 7% |
| Oct 3 | 78°F | 53°F | 102°F 1980 | 39°F 1914 | 7% |
| Oct 4 | 78°F | 53°F | 103°F 1933 | 36°F 1914 | 8% |
| Oct 5 | 78°F | 53°F | 103°F 1933 | 37°F 1919 | 8% |
| Oct 6 | 78°F | 53°F | 102°F 2024 | 35°F 1913 | 8% |
| Oct 7 | 78°F | 53°F | 101°F 2024 | 37°F 1941 | 9% |
| Oct 8 | 77°F | 53°F | 100°F 1996 | 34°F 1941 | 9% |
| Oct 9 | 77°F | 52°F | 102°F 1996 | 37°F 1913 | 9% |
| Oct 10 | 77°F | 52°F | 95°F 1934 | 35°F 1913 | 10% |
| Oct 11 | 77°F | 52°F | 95°F 1983 | 34°F 1915 | 10% |
| Oct 12 | 76°F | 52°F | 96°F 1971 | 34°F 1915 | 10% |
| Oct 13 | 76°F | 52°F | 95°F 1978 | 38°F 1925 | 11% |
| Oct 14 | 76°F | 52°F | 98°F 1961 | 35°F 1985 | 11% |
| Oct 15 | 75°F | 52°F | 99°F 1961 | 36°F 1966 | 11% |
| Oct 16 | 75°F | 52°F | 100°F 1933 | 36°F 1981 | 12% |
| Oct 17 | 75°F | 51°F | 96°F 1974 | 36°F 1934 | 12% |
| Oct 18 | 75°F | 51°F | 94°F 1988 | 31°F 1917 | 12% |
| Oct 19 | 74°F | 51°F | 96°F 1913 | 31°F 1919 | 13% |
| Oct 20 | 74°F | 51°F | 93°F 1929 | 32°F 1919 | 13% |
| Oct 21 | 74°F | 51°F | 91°F 1929 | 33°F 1925 | 13% |
| Oct 22 | 73°F | 51°F | 92°F 1929 | 34°F 1919 | 14% |
| Oct 23 | 73°F | 51°F | 92°F 1929 | 34°F 1961 | 14% |
| Oct 24 | 73°F | 50°F | 93°F 1965 | 33°F 1935 | 15% |
| Oct 25 | 72°F | 50°F | 95°F 1925 | 31°F 1919 | 15% |
| Oct 26 | 72°F | 50°F | 92°F 1993 | 27°F 1919 | 15% |
| Oct 27 | 72°F | 50°F | 89°F 2003 | 29°F 1919 | 16% |
| Oct 28 | 71°F | 50°F | 89°F 2003 | 29°F 1919 | 16% |
| Oct 29 | 71°F | 49°F | 89°F 1955 | 32°F 1916 | 17% |
| Oct 30 | 71°F | 49°F | 87°F 1965 | 25°F 1948 | 17% |
| Oct 31 | 70°F | 49°F | 88°F 1966 | 26°F 1935 | 18% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (PDT).
- October 1
- sunrise 7:07 AM, sunset 6:54 PM
- October 31
- sunrise 7:36 AM, sunset 6:13 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00047880 (San Rafael Civic Ctr), public domain. Records: NOAA GHCN-Daily, station USC00046826, 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.