September
September · August · June
82climate match
United States · 1991–2020
Best time to visit
Early.
September leads for comfortable weather in Early: typically 24°C by day, 10.1°C at night, with 75 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortSeptember
Typical high24°C
Typical low10.1°C
Rain in September75 mm
July
July · August · June
71climate match
September
September · May · October
75climate match
The weakest month is January, scoring 5 against September’s 82 — days reach only -3.2°C, 27° 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
5-3.2° / -13.1°
Feb
5-0.5° / -10.9°
Mar
56.8° / -4.4°
Apr
3314.9° / 1.7°
May
6121.2° / 8.6°
Jun
7126.7° / 14.6°
Jul
6928.5° / 16.8°
Aug
7427.2° / 15.3°
Sep
8224° / 10.1°
Oct
4716.5° / 3.1°
Nov
107.5° / -3.9°
Dec
5-0.1° / -9.6°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | -3.2°C | -13.1°C | 22 mm | 4.3 | 9 h 23 | 5 | Strong coverage |
| February | -0.5°C | -10.9°C | 24 mm | 4.5 | 10 h 29 | 5 | Strong coverage |
| March | 6.8°C | -4.4°C | 47 mm | 6.2 | 11 h 48 | 5 | Strong coverage |
| April | 14.9°C | 1.7°C | 89 mm | 8.7 | 13 h 18 | 33 | Strong coverage |
| May | 21.2°C | 8.6°C | 114 mm | 11.5 | 14 h 35 | 61 | Strong coverage |
| June | 26.7°C | 14.6°C | 128 mm | 10 | 15 h 16 | 71 | Strong coverage |
| July | 28.5°C | 16.8°C | 95 mm | 7.8 | 15 h | 69 | Strong coverage |
| August | 27.2°C | 15.3°C | 113 mm | 8.1 | 13 h 54 | 74 | Strong coverage |
| September | 24°C | 10.1°C | 75 mm | 7.4 | 12 h 26 | 82 | Strong coverage |
| October | 16.5°C | 3.1°C | 59 mm | 7 | 10 h 59 | 47 | Strong coverage |
| November | 7.5°C | -3.9°C | 40 mm | 4.2 | 9 h 42 | 10 | Strong coverage |
| December | -0.1°C | -9.6°C | 30 mm | 4.8 | 9 h 05 | 5 | Strong coverage |
What has changed
Early runs -0.1°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
+0.4
Feb
-1.0
Mar
+0.8
Apr
-1.4
May
-1.4
Jun
-0.2
Jul
-1.3
Aug
-1.1
Sep
+1.6
Oct
-0.2
Nov
+0.7
Dec
+2.0
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 20.0°C27 Jan 2002 | -37.2°C12 Jan 1912 | 31 mm16 Jan 1915 | 64 mm1975 · driest 0 mm in 1971 | 131 |
| February | 23.9°C27 Feb 2024 | -34.4°C5 Feb 1936 | 45 mm27 Feb 1948 | 77 mm1971 · driest 1 mm in 1987 | 132 |
| March | 32.2°C22 Mar 2026 | -28.3°C1 Mar 1962 | 57 mm23 Mar 1991 | 198 mm1979 · driest 0 mm in 1910 | 131 |
| April | 35.6°C23 Apr 1980 | -15.6°C3 Apr 1975 | 67 mm5 Apr 1986 | 239 mm1984 · driest 12 mm in 1910 | 127 |
| May | 42.2°C29 May 1934 | -5.0°C1 May 1909 | 107 mm16 May 1943 | 225 mm1959 · driest 14 mm in 1941 | 130 |
| June | 41.7°C27 Jun 1934 | 0.0°C3 Jun 1969 | 197 mm26 Jun 1899 | 338 mm1967 · driest 14 mm in 1933 | 131 |
| July | 45.0°C14 Jul 1936 | 5.6°C9 Jul 1895 | 118 mm17 Jul 1972 | 320 mm1902 · driest 5 mm in 2013 | 131 |
| August | 45.6°C18 Aug 1936 | 1.7°C27 Aug 1935 | 149 mm30 Aug 1962 | 334 mm2007 · driest 7 mm in 2003 | 131 |
| September | 39.4°C6 Sep 1939 | -6.1°C29 Sep 1899 | 118 mm13 Sep 1978 | 305 mm1965 · driest 0 mm in 1897 | 129 |
| October | 35.0°C2 Oct 1953 | -18.9°C30 Oct 1925 | 69 mm12 Oct 1928 | 160 mm2009 · driest 0 mm in 1952 | 127 |
| November | 26.7°C8 Nov 1931 | -23.9°C7 Nov 1991 | 66 mm30 Nov 1991 | 184 mm1909 · driest 0 mm in 2007 | 127 |
| December | 20.6°C16 Dec 2021 | -33.3°C29 Dec 1917 | 58 mm14 Dec 2015 | 133 mm2015 · driest 0 mm in 1920 | 128 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 31 | <1 | 4 |
| February | 0 | 0 | 27 | <1 | 4 |
| March | <1 | 0 | 25 | 1 | 2 |
| April | 3 | <1 | 11 | 3 | <1 |
| May | 9 | 2 | 1 | 4 | 0 |
| June | 21 | 8 | 0 | 3 | 0 |
| July | 27 | 11 | 0 | 3 | 0 |
| August | 23 | 7 | 0 | 4 | 0 |
| September | 15 | 4 | <1 | 3 | 0 |
| October | 4 | <1 | 9 | 2 | <1 |
| November | <1 | 0 | 23 | 1 | 1 |
| December | 0 | 0 | 30 | <1 | 4 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 13% | 2% | 6% | -6.7–2.1°C |
| February | <1% | 14% | 3% | 9% | -4.6–4.0°C |
| March | 6% | 20% | 5% | 18% | 2.7–11.1°C |
| April | 24% | 26% | 9% | 29% | 12.2–18.4°C |
| May | 49% | 30% | 11% | 35% | 19.6–25.3°C |
| June | 67% | 29% | 12% | 33% | 24.8–29.5°C |
| July | 77% | 23% | 9% | 21% | 27.0–32.2°C |
| August | 75% | 24% | 10% | 23% | 26.2–30.8°C |
| September | 64% | 24% | 9% | 26% | 22.0–27.0°C |
| October | 35% | 18% | 6% | 15% | 14.3–20.5°C |
| November | 4% | 15% | 4% | 11% | 3.8–11.4°C |
| December | 0% | 14% | 3% | 9% | -4.2–3.8°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 4854812
- NOAA station
- USC00137312 · SAC CITY
- Station distance
- 15.2 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 27 usable years
- Daylight
- Calculated from latitude 42.46°, 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.