October
October · April · September
83climate match
Mexico · 1991–2020
Best time to visit
San Francisco.
October leads for comfortable weather in San Francisco: typically 25.9°C by day, 9.1°C at night, with 24 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortOctober
Typical high25.9°C
Typical low9.1°C
Rain in October24 mm
September
September · July · June
79climate match
November
November · March · October
87climate match
The weakest month is January, scoring 41 against October’s 83 — nights drop to -1.7°C, and days reach only 15.2°C, 9° below the 24°C the score treats as ideal.
Month by month
The whole year,
without the guesswork.
The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.
Jan
4115.2° / -1.7°
Feb
5317.8° / 0.4°
Mar
7422° / 4°
Apr
8126.1° / 8.2°
May
7630.4° / 13.3°
Jun
5934.5° / 18.3°
Jul
5533.9° / 19.4°
Aug
5833.2° / 18.7°
Sep
7830° / 15.1°
Oct
8325.9° / 9.1°
Nov
6419.9° / 2.7°
Dec
4115° / -1.3°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | 15.2°C | -1.7°C | 10 mm | 2.1 | 10 h 22 | 41 | Strong coverage |
| February | 17.8°C | 0.4°C | 11 mm | 2.2 | 11 h 04 | 53 | Strong coverage |
| March | 22°C | 4°C | 7 mm | 1.5 | 11 h 54 | 74 | Strong coverage |
| April | 26.1°C | 8.2°C | 6 mm | 1.4 | 12 h 52 | 81 | Strong coverage |
| May | 30.4°C | 13.3°C | 13 mm | 2.2 | 13 h 41 | 76 | Strong coverage |
| June | 34.5°C | 18.3°C | 27 mm | 3.5 | 14 h 06 | 59 | Strong coverage |
| July | 33.9°C | 19.4°C | 47 mm | 6.2 | 13 h 56 | 55 | Strong coverage |
| August | 33.2°C | 18.7°C | 49 mm | 6.6 | 13 h 15 | 58 | Strong coverage |
| September | 30°C | 15.1°C | 37 mm | 4.7 | 12 h 19 | 78 | Strong coverage |
| October | 25.9°C | 9.1°C | 24 mm | 3.1 | 11 h 23 | 83 | Strong coverage |
| November | 19.9°C | 2.7°C | 10 mm | 2 | 10 h 34 | 64 | Strong coverage |
| December | 15°C | -1.3°C | 13 mm | 2.4 | 10 h 11 | 41 | Strong coverage |
What has changed
San Francisco runs +0.4°C
on the 1961–1990 baseline.
Each bar compares the 2011–2025 daytime average for that month against the same month in 1961–1990, measured at the same station. Months where the older record is too thin to compare are left blank.
Jan
+0.3
Feb
+1.0
Mar
+1.3
Apr
-0.1
May
-0.9
Jun
+0.3
Jul
+0.3
Aug
+1.0
Sep
+0.3
Oct
+0.1
Nov
+0.7
Dec
+0.8
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 26.7°C21 Jan 1974 | -21.7°C11 Jan 1962 | 51 mm24 Jan 1974 | 89 mm1974 · driest 0 mm in 1972 | 77 |
| February | 31.1°C19 Feb 2016 | -19.4°C2 Feb 1985 | 23 mm20 Feb 1997 | 46 mm2005 · driest 0 mm in 1984 | 78 |
| March | 34.4°C31 Mar 1946 | -12.8°C11 Mar 1948 | 24 mm31 Mar 1945 | 42 mm2015 · driest 0 mm in 2021 | 78 |
| April | 37.8°C10 Apr 1954 | -4.4°C9 Apr 1973 | 24 mm13 Apr 2010 | 42 mm1981 · driest 0 mm in 2003 | 78 |
| May | 40.6°C28 May 1951 | -0.6°C3 May 2013 | 38 mm8 May 1959 | 67 mm1992 · driest 0 mm in 1996 | 76 |
| June | 43.3°C29 Jun 1994 | 7.2°C1 Jun 1964 | 77 mm28 Jun 1996 | 143 mm1996 · driest 0 mm in 2024 | 75 |
| July | 42.2°C3 Jul 1989 | 11.7°C10 Jul 1946 | 56 mm22 Jul 1990 | 229 mm1990 · driest 0 mm in 1966 | 76 |
| August | 42.2°C21 Aug 1969 | 8.9°C24 Aug 1971 | 178 mm22 Aug 1966 | 242 mm1966 · driest 0 mm in 1983 | 76 |
| September | 40.0°C5 Sep 1948 | 0.6°C27 Sep 1970 | 88 mm25 Sep 1978 | 251 mm1978 · driest 0 mm in 2000 | 78 |
| October | 36.7°C1 Oct 1977 | -7.2°C28 Oct 2020 | 51 mm17 Oct 1960 | 110 mm1971 · driest 0 mm in 1991 | 77 |
| November | 30.6°C7 Nov 2023 | -12.2°C30 Nov 1948 | 51 mm29 Nov 1969 | 147 mm1969 · driest 0 mm in 1966 | 77 |
| December | 27.8°C1 Dec 1954 | -17.8°C24 Dec 1953 | 33 mm4 Dec 1984 | 102 mm1969 · driest 0 mm in 1955 | 78 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) |
|---|---|---|---|---|
| January | <1 | 0 | 21 | <1 |
| February | 3 | <1 | 13 | <1 |
| March | 10 | <1 | 6 | <1 |
| April | 20 | 7 | <1 | <1 |
| May | 28 | 19 | 0 | <1 |
| June | 29 | 27 | 0 | <1 |
| July | 30 | 27 | 0 | 2 |
| August | 30 | 26 | 0 | 2 |
| September | 27 | 18 | 0 | 1 |
| October | 20 | 7 | 1 | <1 |
| November | 6 | <1 | 8 | <1 |
| December | <1 | 0 | 20 | <1 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 21% | 7% | <1% | 3% | 12.2–17.6°C |
| February | 41% | 6% | <1% | 2% | 14.9–20.5°C |
| March | 68% | 4% | <1% | <1% | 19.5–23.8°C |
| April | 87% | 4% | <1% | 1% | 24.1–28.8°C |
| May | 92% | 7% | 1% | 4% | 28.9–32.7°C |
| June | 89% | 11% | 3% | 8% | 33.2–36.5°C |
| July | 80% | 19% | 5% | 18% | 32.2–36.4°C |
| August | 80% | 20% | 5% | 18% | 31.3–36.0°C |
| September | 83% | 16% | 4% | 14% | 28.2–32.9°C |
| October | 83% | 10% | 3% | 7% | 23.9–27.9°C |
| November | 56% | 6% | 1% | 3% | 17.1–22.9°C |
| December | 23% | 7% | <1% | 3% | 12.9–17.9°C |
A warm and dry day reaches 20°C with under 1 mm of rain; a wet day gets 1 mm or more; a washout gets 10 mm or more. The week column is the share of seven-day stretches in that month, across the station’s whole daily record, that contained three or more wet days — the odds a week-long trip is rained on repeatedly, counted rather than modelled. The last column is the 10th to 90th percentile of that month’s daytime average across individual years: a narrow band means the average is what you will get, a wide one means the average is a midpoint between years that felt quite different.
The evidence behind this page
Nearby, measured,
and named.
- Place identity
- GeoNames 3974666
- NOAA station
- USC00419295 · VAN HORN
- Station distance
- 74.9 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 27 usable years
- Daylight
- Calculated from latitude 30.54°, mid-month, sunrise to sunset including refraction. Not a station measurement.
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.