September
September · June · May
85climate match
United States · 1991–2020
Best time to visit
Williams.
September leads for comfortable weather in Williams: typically 24.5°C by day, 8.9°C at night, with 40 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortSeptember
Typical high24.5°C
Typical low8.9°C
Rain in September40 mm
June
June · July · August
64climate match
May
May · October · September
86climate match
The weakest month is January, scoring 7 against September’s 85 — days reach only 8.3°C, 16° below the 24°C the score treats as ideal, and nights drop to -5.1°C.
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
78.3° / -5.1°
Feb
119.4° / -4.2°
Mar
2912.9° / -1.9°
Apr
4916.6° / 0.4°
May
7421.6° / 4.8°
Jun
7927.5° / 9.6°
Jul
7028.7° / 12.8°
Aug
7027.3° / 12.2°
Sep
8524.5° / 8.9°
Oct
6119.1° / 3.1°
Nov
3413° / -1.6°
Dec
88.2° / -5.3°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | 8.3°C | -5.1°C | 58 mm | 5.5 | 10 h 01 | 7 | Strong coverage |
| February | 9.4°C | -4.2°C | 64 mm | 5.5 | 10 h 51 | 11 | Strong coverage |
| March | 12.9°C | -1.9°C | 51 mm | 5.2 | 11 h 52 | 29 | Strong coverage |
| April | 16.6°C | 0.4°C | 23 mm | 3.1 | 13 h 02 | 49 | Strong coverage |
| May | 21.6°C | 4.8°C | 20 mm | 3.3 | 14 h | 74 | Strong coverage |
| June | 27.5°C | 9.6°C | 11 mm | 1.8 | 14 h 31 | 79 | Strong coverage |
| July | 28.7°C | 12.8°C | 73 mm | 8.7 | 14 h 19 | 70 | Strong coverage |
| August | 27.3°C | 12.2°C | 86 mm | 10.2 | 13 h 29 | 70 | Strong coverage |
| September | 24.5°C | 8.9°C | 40 mm | 4.7 | 12 h 21 | 85 | Strong coverage |
| October | 19.1°C | 3.1°C | 40 mm | 3.6 | 11 h 14 | 61 | Strong coverage |
| November | 13°C | -1.6°C | 33 mm | 3.3 | 10 h 16 | 34 | Strong coverage |
| December | 8.2°C | -5.3°C | 49 mm | 4.7 | 9 h 47 | 8 | Strong coverage |
What has changed
Williams runs +1.4°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
+0.8
Feb
+0.9
Mar
+2.0
Apr
+2.0
May
+0.8
Jun
+2.4
Jul
+1.0
Aug
+1.3
Sep
+1.5
Oct
+1.5
Nov
+1.9
Dec
+1.1
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 23.3°C31 Jan 1976 | -31.7°C22 Jan 1937 | 66 mm11 Jan 1930 | 191 mm1993 · driest 0 mm in 1948 | 117 |
| February | 23.3°C28 Feb 1976 | -27.8°C6 Feb 1899 | 89 mm20 Feb 1993 | 243 mm1993 · driest 0 mm in 1924 | 119 |
| March | 29.4°C19 Mar 2026 | -21.1°C4 Mar 1932 | 83 mm23 Mar 2023 | 217 mm1918 · driest 0 mm in 1988 | 122 |
| April | 30.6°C25 Apr 1910 | -16.7°C1 Apr 1912 | 51 mm2 Apr 1946 | 148 mm1926 · driest 0 mm in 2008 | 124 |
| May | 33.3°C31 May 1910 | -13.3°C11 May 1933 | 33 mm3 May 1908 | 128 mm1992 · driest 0 mm in 1911 | 122 |
| June | 37.8°C26 Jun 1970 | -5.6°C7 Jun 1932 | 64 mm13 Jun 1955 | 70 mm1927 · driest 0 mm in 2011 | 123 |
| July | 38.9°C1 Jul 1909 | 0.0°C4 Jul 1912 | 70 mm31 Jul 2010 | 266 mm1919 · driest 0 mm in 1942 | 123 |
| August | 38.3°C2 Aug 1902 | 0.0°C28 Aug 1920 | 63 mm29 Aug 1951 | 224 mm1963 · driest 7 mm in 1980 | 122 |
| September | 33.9°C1 Sep 1929 | -11.7°C26 Sep 1934 | 69 mm18 Sep 1965 | 203 mm1939 · driest 0 mm in 1957 | 121 |
| October | 30.0°C5 Oct 2020 | -13.9°C31 Oct 1929 | 64 mm30 Oct 1991 | 267 mm1972 · driest 0 mm in 1950 | 122 |
| November | 26.7°C28 Nov 1903 | -21.7°C24 Nov 1931 | 70 mm3 Nov 1957 | 195 mm1905 · driest 0 mm in 1917 | 123 |
| December | 23.3°C27 Dec 1980 | -27.2°C13 Dec 1931 | 101 mm29 Dec 2004 | 192 mm1965 · driest 0 mm in 1917 | 120 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 28 | 2 | 4 |
| February | 0 | 0 | 25 | 2 | 4 |
| March | 0 | 0 | 22 | 2 | 3 |
| April | <1 | 0 | 15 | <1 | 2 |
| May | 7 | <1 | 4 | <1 | <1 |
| June | 23 | 8 | <1 | <1 | 0 |
| July | 27 | 12 | 0 | 2 | 0 |
| August | 25 | 6 | 0 | 3 | 0 |
| September | 15 | <1 | <1 | 1 | 0 |
| October | 2 | 0 | 7 | 1 | <1 |
| November | 0 | 0 | 20 | 1 | 2 |
| December | 0 | 0 | 28 | 1 | 3 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | <1% | 18% | 6% | 19% | 4.9–10.1°C |
| February | <1% | 19% | 6% | 21% | 5.9–12.0°C |
| March | 5% | 18% | 6% | 17% | 8.6–15.1°C |
| April | 27% | 12% | 3% | 10% | 13.3–19.0°C |
| May | 66% | 9% | 2% | 6% | 18.4–23.8°C |
| June | 91% | 6% | 1% | 4% | 24.7–29.6°C |
| July | 72% | 28% | 8% | 38% | 26.9–30.4°C |
| August | 70% | 30% | 9% | 35% | 25.4–29.2°C |
| September | 79% | 15% | 4% | 14% | 22.5–26.7°C |
| October | 49% | 11% | 4% | 9% | 16.1–21.8°C |
| November | 9% | 11% | 4% | 9% | 9.7–16.3°C |
| December | <1% | 16% | 5% | 15% | 5.7–11.6°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 5321098
- NOAA station
- USC00029359 · WILLIAMS
- Station distance
- 0.9 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 27 usable years
- Daylight
- Calculated from latitude 35.25°, 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.