September
Other strong months: October and August
76/100 weather score
United States · 1991–2020
Best time to visit
Colma
For Colma, September has the most comfortable weather in our climate comparison. Typical daytime highs are 18.1°C, nights average 12.4°C, and rainfall totals about 2 mm. Figures use measured 1991–2020 normals from the nearest eligible NOAA station.
Best all-round monthSeptember
Typical daytime high18.1°C
Typical night-time low12.4°C
September rainfall2 mm
September
Other strong months: October and August
43/100 weather score
October
Other strong months: September and August
94/100 weather score
Make the answer personal
Choose the weather
that suits you.
Set the daytime temperature and rainfall you are comfortable with. We will show only the months that meet every choice, using the measured 1991–2020 averages below.
5 months fit your choices for Colma
December has the lowest comfort score at 38 out of 100, compared with September at 76. The main reason is that days reach only 14.7°C, 9° below the 24°C the score treats as ideal.
Quick answers
Planning a trip to Colma?
These answers come from the same measured monthly climate record shown on this page.
When is the best time to visit Colma?
September is the strongest all-round choice in our temperature-and-rainfall comparison, with a typical daytime high of 18.1°C and 2 mm of rain.
What is the hottest month in Colma?
October is hottest in this record, with a typical daytime high of 18.7°C and a night-time low of 11.4°C.
Which month has the least rain?
July has the lowest monthly rainfall total at 0 mm.
Is this a weather forecast?
No. These are long-term measured averages from 1991–2020. Check a current forecast before you travel.
Month by month
See how the weather
changes through the year.
The bars combine daytime temperature, night-time temperature and rainfall. The figures are measured historical averages, not a forecast for a particular trip.
| Month | Day | Night | Rain | Wet days | Sea | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|---|
| January | 14.6°C | 7.3°C | 100 mm | 9.3 | 11.9°C | 9 h 49 | 40 | Strong coverage |
| February | 15.5°C | 8°C | 104 mm | 9.2 | 12.0°C | 10 h 44 | 44 | Strong coverage |
| March | 15.8°C | 8.6°C | 70 mm | 8 | 12.1°C | 11 h 50 | 52 | Strong coverage |
| April | 15.4°C | 9.1°C | 35 mm | 4.8 | 11.6°C | 13 h 07 | 59 | Strong coverage |
| May | 15.2°C | 10.3°C | 16 mm | 2.5 | 11.8°C | 14 h 11 | 62 | Strong coverage |
| June | 15.7°C | 11.1°C | 3 mm | 0.7 | 12.4°C | 14 h 45 | 66 | Strong coverage |
| July | 16.2°C | 12.1°C | 0 mm | 0.1 | 13.6°C | 14 h 32 | 69 | Strong coverage |
| August | 17°C | 12.8°C | 1 mm | 0.2 | 14.4°C | 13 h 37 | 73 | Strong coverage |
| September | 18.1°C | 12.4°C | 2 mm | 0.4 | 14.6°C | 12 h 23 | 76 | Strong coverage |
| October | 18.7°C | 11.4°C | 20 mm | 2.2 | 13.9°C | 11 h 09 | 76 | Strong coverage |
| November | 17.2°C | 9.4°C | 58 mm | 5.5 | 13.1°C | 10 h 05 | 62 | Strong coverage |
| December | 14.7°C | 7.3°C | 114 mm | 9.6 | 12.2°C | 9 h 34 | 38 | Strong coverage |
What has changed
Recent daytime highs are
0.3°C cooler in Colma.
Each bar shows the difference between the 2011–2025 average daytime high and the 1961–1990 average for the same month at the same station. A blank month does not have enough older observations for a reliable comparison.
Jan
+0.9
Feb
+0.4
Mar
+0.5
Apr
-0.4
May
-1.5
Jun
-1.9
Jul
-1.9
Aug
-1.3
Sep
-0.7
Oct
+0.1
Nov
+1.0
Dec
+1.1
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 26.1°C8 Jan 1962 | -1.7°C9 Jan 1981 | 94 mm8 Jan 2018 | 259 mm1967 · driest 0 mm in 2015 | 63 |
| February | 25.0°C12 Feb 1996 | -1.7°C26 Feb 1960 | 99 mm2 Feb 1998 | 353 mm1998 · driest 0 mm in 2020 | 65 |
| March | 27.2°C9 Mar 2004 | -3.9°C20 Mar 2023 | 64 mm5 Mar 1992 | 247 mm1983 · driest 0 mm in 2009 | 66 |
| April | 29.4°C6 Apr 1989 | -2.8°C5 Apr 2018 | 51 mm6 Apr 2018 | 133 mm1967 · driest 0 mm in 1979 | 64 |
| May | 27.8°C12 May 1976 | 1.7°C5 May 2017 | 37 mm15 May 1996 | 94 mm1998 · driest 0 mm in 2023 | 66 |
| June | 27.8°C27 Jun 1976 | 2.2°C11 Jun 1965 | 42 mm2 Jun 1967 | 61 mm2011 · driest 0 mm in 1959 | 63 |
| July | 29.4°C3 Jul 1970 | 4.4°C28 Jul 2021 | 13 mm8 Jul 1974 | 14 mm1974 · driest 0 mm in 1983 | 64 |
| August | 29.4°C14 Aug 1991 | 4.4°C28 Aug 2018 | 31 mm11 Aug 1965 | 31 mm1965 · driest 0 mm in 2006 | 63 |
| September | 35.6°C28 Sep 1966 | 3.3°C20 Sep 2021 | 50 mm18 Sep 1959 | 52 mm1959 · driest 0 mm in 2010 | 63 |
| October | 35.6°C3 Oct 2014 | 1.7°C21 Oct 2020 | 80 mm13 Oct 1962 | 202 mm1962 · driest 0 mm in 2015 | 62 |
| November | 32.2°C1 Nov 2019 | -3.3°C21 Nov 1982 | 54 mm13 Nov 1972 | 185 mm1973 · driest 0 mm in 2023 | 62 |
| December | 22.8°C15 Dec 1980 | -5.0°C6 Dec 2017 | 110 mm11 Dec 2014 | 309 mm2014 · driest 0 mm in 1989 | 66 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) |
|---|---|---|---|---|
| January | 0 | 0 | <1 | 3 |
| February | <1 | 0 | <1 | 3 |
| March | <1 | 0 | 0 | 3 |
| April | <1 | 0 | <1 | 1 |
| May | <1 | 0 | 0 | <1 |
| June | 0 | 0 | 0 | <1 |
| July | 0 | 0 | 0 | 0 |
| August | <1 | 0 | 0 | 0 |
| September | 1 | <1 | 0 | 0 |
| October | 3 | <1 | 0 | <1 |
| November | 1 | <1 | <1 | 2 |
| December | 0 | 0 | <1 | 3 |
The best month has moved. On the 1961–1990 numbers the strongest month here was September (scoring 80); on 2011–2025 it is October (78). Both are scored the same way, from the same station — only the climate underneath changed.
| Month | Dry days reaching 20°C | Wet days | Days with heavy rain | Weeks with 3+ wet days | Typical high by year |
|---|---|---|---|---|---|
| January | 4% | 28% | 10% | 36% | 13.2–16.1°C |
| February | 10% | 30% | 11% | 37% | 13.9–17.4°C |
| March | 10% | 26% | 9% | 29% | 14.4–17.8°C |
| April | 7% | 14% | 4% | 13% | 13.9–17.3°C |
| May | 6% | 7% | <1% | 4% | 14.0–17.4°C |
| June | 7% | 2% | <1% | <1% | 14.9–18.4°C |
| July | 9% | <1% | 0% | 0% | 15.4–18.8°C |
| August | 15% | <1% | <1% | <1% | 16.2–19.0°C |
| September | 27% | 2% | <1% | <1% | 16.6–21.4°C |
| October | 29% | 8% | 3% | 8% | 17.0–20.9°C |
| November | 18% | 20% | 8% | 24% | 15.5–18.8°C |
| December | 3% | 29% | 11% | 36% | 12.8–16.2°C |
A dry day reaching 20°C records under 1 mm of rain. A wet day records at least 1 mm, while a heavy-rain day records at least 10 mm. The weekly figure is the share of seven-day periods containing three or more wet days. The final column shows the middle 80% of average daytime highs recorded for that month in individual years; a wider range means conditions have varied more from one year to another.
The evidence behind this page
Where these figures
come from.
- Place identity
- GeoNames 5338703
- NOAA station
- USC00047767 · SAN FRANCISCO OCEANSIDE
- Station distance
- 7 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 25 usable years
- Daylight
- Calculated from latitude 37.68°, mid-month, sunrise to sunset including refraction. Not a station measurement.
- Sea temperature
- NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 16 km from the place centre. A sheltered bay can run warmer than the open sea it is measured from.
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.
Next step
Choose your month.
Then plan the details.
The weather comparison for Colma is based on climate evidence, not payments from travel companies. Flight, accommodation and activity links will be clearly labelled when they are added; there are no booking offers on this page today.
How travel partnerships will work