September
September · June · May
83climate match
United States · 1991–2020
Best time to visit
South Windsor.
September leads for comfortable weather in South Windsor: typically 24.4°C by day, 13.2°C at night, with 98 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortSeptember
Typical high24.4°C
Typical low13.2°C
Rain in September98 mm
July
July · August · June
74climate match
May
May · October · September
77climate match
The weakest month is January, scoring 5 against September’s 83 — days reach only 2.7°C, 21° 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
52.7° / -6.7°
Feb
54.2° / -5.8°
Mar
78.7° / -1.8°
Apr
3915.7° / 4°
May
6921.7° / 9.6°
Jun
7826.5° / 15.2°
Jul
6229.3° / 18.5°
Aug
6928.4° / 17.7°
Sep
8324.4° / 13.2°
Oct
4817.5° / 6.4°
Nov
2111.2° / 1°
Dec
55.4° / -3.6°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | 2.7°C | -6.7°C | 76 mm | 8.1 | 9 h 27 | 5 | Strong coverage |
| February | 4.2°C | -5.8°C | 65 mm | 7.4 | 10 h 31 | 5 | Strong coverage |
| March | 8.7°C | -1.8°C | 89 mm | 8.6 | 11 h 48 | 7 | Strong coverage |
| April | 15.7°C | 4°C | 94 mm | 8.9 | 13 h 17 | 39 | Strong coverage |
| May | 21.7°C | 9.6°C | 87 mm | 9.7 | 14 h 31 | 69 | Strong coverage |
| June | 26.5°C | 15.2°C | 98 mm | 8.6 | 15 h 12 | 78 | Strong coverage |
| July | 29.3°C | 18.5°C | 103 mm | 8.3 | 14 h 56 | 62 | Strong coverage |
| August | 28.4°C | 17.7°C | 91 mm | 7.4 | 13 h 52 | 69 | Strong coverage |
| September | 24.4°C | 13.2°C | 98 mm | 6.6 | 12 h 26 | 83 | Strong coverage |
| October | 17.5°C | 6.4°C | 107 mm | 8 | 11 h 00 | 48 | Strong coverage |
| November | 11.2°C | 1°C | 88 mm | 7.8 | 9 h 46 | 21 | Strong coverage |
| December | 5.4°C | -3.6°C | 96 mm | 9.2 | 9 h 09 | 5 | Strong coverage |
What has changed
South Windsor 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
+1.9
Feb
+1.7
Mar
+1.4
Apr
+1.1
May
+1.2
Jun
+1.1
Jul
+1.5
Aug
+1.2
Sep
+1.5
Oct
+1.2
Nov
+0.7
Dec
+2.3
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 21.7°C6 Jan 2007 | -27.2°C22 Jan 1961 | 64 mm8 Jan 1990 | 325 mm1979 · driest 10 mm in 1970 | 107 |
| February | 23.3°C25 Feb 1985 | -31.1°C16 Feb 1943 | 70 mm13 Feb 2008 | 224 mm2008 · driest 10 mm in 1987 | 107 |
| March | 30.0°C29 Mar 1945 | -20.0°C19 Mar 1967 | 71 mm28 Mar 1932 | 234 mm1953 · driest 15 mm in 2006 | 106 |
| April | 34.4°C17 Apr 2002 | -13.3°C4 Apr 1997 | 76 mm11 Apr 1983 | 278 mm1983 · driest 17 mm in 1942 | 105 |
| May | 37.2°C21 May 1996 | -6.7°C1 May 1997 | 93 mm31 May 1940 | 281 mm1989 · driest 16 mm in 1986 | 106 |
| June | 37.8°C24 Jun 2025 | -1.1°C6 Jun 1997 | 89 mm6 Jun 1982 | 287 mm2013 · driest 4 mm in 1999 | 105 |
| July | 39.4°C22 Jul 2011 | 5.0°C28 Jul 1996 | 91 mm24 Jul 1988 | 336 mm2023 · driest 14 mm in 1924 | 106 |
| August | 39.4°C9 Aug 2001 | 3.3°C31 Aug 1965 | 133 mm19 Aug 1955 | 348 mm1955 · driest 3 mm in 2025 | 105 |
| September | 38.3°C2 Sep 1953 | -1.7°C24 Sep 1963 | 155 mm20 Sep 1938 | 371 mm1938 · driest 12 mm in 2024 | 104 |
| October | 31.7°C6 Oct 1959 | -8.9°C27 Oct 1996 | 110 mm14 Oct 2005 | 368 mm2005 · driest 5 mm in 1924 | 104 |
| November | 28.3°C2 Nov 1950 | -15.0°C17 Nov 1996 | 85 mm28 Nov 1937 | 201 mm1988 · driest 12 mm in 1976 | 106 |
| December | 23.9°C8 Dec 1998 | -24.4°C30 Dec 1933 | 64 mm25 Dec 2020 | 209 mm2023 · driest 15 mm in 1980 | 105 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 26 | 3 | 1 |
| February | 0 | 0 | 24 | 2 | 1 |
| March | <1 | 0 | 20 | 3 | <1 |
| April | 2 | <1 | 5 | 3 | 0 |
| May | 9 | 3 | <1 | 3 | 0 |
| June | 20 | 7 | <1 | 3 | 0 |
| July | 28 | 14 | 0 | 3 | 0 |
| August | 27 | 11 | 0 | 3 | 0 |
| September | 14 | 3 | <1 | 3 | 0 |
| October | 2 | <1 | 4 | 3 | 0 |
| November | <1 | 0 | 14 | 3 | <1 |
| December | 0 | 0 | 24 | 3 | <1 |
The best month has moved. On the 1961–1990 numbers the strongest month here was June (scoring 84); on 2011–2025 it is September (85). Both are scored the same way, from the same station — only the climate underneath changed.
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | <1% | 27% | 10% | 29% | -1.2–5.3°C |
| February | <1% | 27% | 9% | 31% | 0.5–6.6°C |
| March | 3% | 29% | 10% | 34% | 5.4–11.5°C |
| April | 17% | 31% | 11% | 37% | 12.7–17.5°C |
| May | 49% | 31% | 10% | 38% | 19.0–23.7°C |
| June | 68% | 29% | 11% | 33% | 24.2–28.0°C |
| July | 73% | 27% | 11% | 26% | 27.2–30.5°C |
| August | 75% | 25% | 9% | 24% | 26.3–29.4°C |
| September | 65% | 23% | 9% | 22% | 22.0–25.6°C |
| October | 28% | 23% | 9% | 21% | 15.6–19.9°C |
| November | 4% | 27% | 11% | 30% | 8.6–13.4°C |
| December | <1% | 29% | 10% | 33% | 1.3–7.8°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 4843353
- NOAA station
- USW00014752 · HARTFORD BRAINARD FLD
- Station distance
- 10.1 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 28 usable years
- Daylight
- Calculated from latitude 41.82°, 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.