September
Other strong months: October and August
89/100 weather score
United States · 1991–2020
Best time to visit
Chinatown
For Chinatown, September has the most comfortable weather in our climate comparison. Typical daytime highs are 21.6°C, nights average 13.3°C, and rainfall totals about 3 mm. Figures use measured 1991–2020 normals from the nearest eligible NOAA station.
Best all-round monthSeptember
Typical daytime high21.6°C
Typical night-time low13.3°C
September rainfall3 mm
September
Other strong months: October and August
56/100 weather score
June
Other strong months: July and August
95/100 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.
6 months fit your choices for Chinatown
The lowest comfort score is 40 out of 100. January and December share that score. In January, that is mainly because days reach only 14.7°C, 9° below the 24°C the score treats as ideal.
Quick answers
Planning a trip to Chinatown?
These answers come from the same measured monthly climate record shown on this page.
When is the best time to visit Chinatown?
September is the strongest all-round choice in our temperature-and-rainfall comparison, with a typical daytime high of 21.6°C and 3 mm of rain.
What is the hottest month in Chinatown?
September is hottest in this record, with a typical daytime high of 21.6°C and a night-time low of 13.3°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 | 14.7°C | 8.3°C | 112 mm | 9.6 | 11.6°C | 9 h 49 | 40 | Strong coverage |
| February | 16.1°C | 9°C | 111 mm | 9.5 | 11.9°C | 10 h 44 | 47 | Strong coverage |
| March | 17.1°C | 9.5°C | 80 mm | 8.9 | 12.0°C | 11 h 50 | 56 | Strong coverage |
| April | 17.6°C | 10°C | 41 mm | 5.3 | 11.5°C | 13 h 07 | 67 | Strong coverage |
| May | 18.2°C | 10.9°C | 18 mm | 2.9 | 11.7°C | 14 h 11 | 73 | Strong coverage |
| June | 19.5°C | 11.8°C | 5 mm | 1 | 12.1°C | 14 h 46 | 79 | Strong coverage |
| July | 19.5°C | 12.6°C | 0 mm | 0.1 | 13.4°C | 14 h 32 | 81 | Strong coverage |
| August | 20.3°C | 13.2°C | 1 mm | 0.2 | 14.2°C | 13 h 37 | 85 | Strong coverage |
| September | 21.6°C | 13.3°C | 3 mm | 0.7 | 14.4°C | 12 h 23 | 89 | Strong coverage |
| October | 21.3°C | 12.6°C | 24 mm | 2.7 | 13.7°C | 11 h 09 | 87 | Strong coverage |
| November | 17.9°C | 10.5°C | 66 mm | 6.3 | 12.9°C | 10 h 05 | 64 | Strong coverage |
| December | 14.7°C | 8.4°C | 121 mm | 9.5 | 12.0°C | 9 h 33 | 40 | Strong coverage |
What has changed
Recent daytime highs are
0.4°C warmer in Chinatown.
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
+1.3
Feb
+0.3
Mar
+0.4
Apr
+0.2
May
+0.2
Jun
+0.5
Jul
+0.2
Aug
+0.5
Sep
+0.2
Oct
+0.6
Nov
+0.2
Dec
+0.7
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 26.1°C8 Jan 1962 | -1.1°C8 Jan 1937 | 99 mm4 Jan 1982 | 307 mm1998 · driest 0 mm in 2015 | 106 |
| February | 27.2°C26 Feb 1986 | -0.6°C6 Feb 1989 | 74 mm2 Feb 1998 | 378 mm1998 · driest 0 mm in 2020 | 106 |
| March | 32.2°C20 Mar 2026 | 1.7°C11 Mar 1922 | 65 mm31 Mar 1982 | 230 mm1983 · driest 1 mm in 1923 | 106 |
| April | 34.4°C8 Apr 1989 | 4.4°C11 Apr 1967 | 56 mm6 Apr 2018 | 139 mm1958 · driest 0 mm in 1949 | 105 |
| May | 36.1°C15 May 2008 | 6.1°C10 May 2003 | 36 mm27 May 1990 | 102 mm1925 · driest 0 mm in 1965 | 106 |
| June | 39.4°C14 Jun 2000 | 8.3°C7 Jun 1999 | 34 mm2 Jun 1967 | 51 mm2011 · driest 0 mm in 1939 | 106 |
| July | 37.2°C3 Jul 1931 | 8.3°C4 Jul 1953 | 18 mm8 Jul 1974 | 19 mm1974 · driest 0 mm in 1950 | 106 |
| August | 36.7°C24 Aug 2010 | 8.9°C1 Aug 1955 | 14 mm19 Aug 1997 | 20 mm1976 · driest 0 mm in 1988 | 105 |
| September | 41.1°C1 Sep 2017 | 8.9°C27 Sep 1926 | 51 mm18 Sep 1959 | 52 mm1959 · driest 0 mm in 1987 | 105 |
| October | 38.9°C5 Oct 1987 | 6.1°C31 Oct 1935 | 102 mm24 Oct 2021 | 179 mm2021 · driest 0 mm in 2015 | 105 |
| November | 30.0°C1 Nov 1966 | 3.9°C23 Nov 1931 | 141 mm5 Nov 1994 | 267 mm1994 · driest 0 mm in 1959 | 105 |
| December | 24.4°C12 Dec 1958 | -2.8°C11 Dec 1932 | 139 mm31 Dec 2022 | 306 mm2002 · driest 0 mm in 1989 | 105 |
| Month | Days 25°C+ | Days 30°C+ | Heavy rain (10 mm+) |
|---|---|---|---|
| January | 0 | 0 | 4 |
| February | <1 | 0 | 4 |
| March | 1 | 0 | 3 |
| April | 2 | <1 | 1 |
| May | 2 | <1 | <1 |
| June | 3 | <1 | <1 |
| July | 2 | <1 | 0 |
| August | 3 | <1 | 0 |
| September | 6 | 2 | 0 |
| October | 7 | 2 | <1 |
| November | 1 | 0 | 2 |
| December | 0 | 0 | 4 |
| Month | Dry days reaching 20°C | Wet days | Days with heavy rain | Weeks with 3+ wet days | Typical high by year |
|---|---|---|---|---|---|
| January | 3% | 29% | 12% | 39% | 11.9–15.5°C |
| February | 11% | 30% | 12% | 37% | 13.9–17.6°C |
| March | 18% | 26% | 9% | 31% | 14.3–19.0°C |
| April | 19% | 16% | 4% | 14% | 15.1–19.2°C |
| May | 20% | 7% | 1% | 5% | 15.9–19.9°C |
| June | 29% | 2% | <1% | <1% | 17.1–20.8°C |
| July | 29% | <1% | 0% | 0% | 17.3–21.1°C |
| August | 37% | <1% | <1% | <1% | 17.8–21.6°C |
| September | 52% | 3% | <1% | 1% | 19.2–23.0°C |
| October | 50% | 9% | 3% | 8% | 19.2–22.6°C |
| November | 23% | 20% | 7% | 25% | 15.9–19.8°C |
| December | 2% | 28% | 12% | 37% | 12.4–15.9°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 5336477
- NOAA station
- USW00023272 · SAN FRANCISCO DWTN
- Station distance
- 3.3 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 30 usable years
- Daylight
- Calculated from latitude 37.80°, mid-month, sunrise to sunset including refraction. Not a station measurement.
- Sea temperature
- NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 21 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 Chinatown 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