United States · 1991–2020

Best time to visit
South Windham.

September leads for comfortable weather in South Windham: typically 24°C by day, 11.7°C at night, with 104 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high24°C

Typical low11.7°C

Rain in September104 mm

Comfort

September

September · June · August

80climate match

Beach

July

July · August · June

73climate match

Outdoors

May

May · September · October

76climate match

The weakest month is January, scoring 5 against September’s 80 — days reach only 2.6°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

52.6° / -7.6°

Feb

54.4° / -6.5°

Mar

68.8° / -2.5°

Apr

3515.5° / 2.8°

May

6621.4° / 8.5°

Jun

7625.7° / 13.6°

Jul

7028.4° / 16.8°

Aug

7527.7° / 16°

Sep

8024° / 11.7°

Oct

4617.3° / 5.3°

Nov

2011.3° / -0.1°

Dec

55.6° / -4.3°

Monthly climate evidence for South Windham — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	2.6°C	-7.6°C	73 mm	7.6	9 h 28	5	Good coverage
February	4.4°C	-6.5°C	72 mm	7.8	10 h 32	5	Good coverage
March	8.8°C	-2.5°C	91 mm	8.2	11 h 48	6	Good coverage
April	15.5°C	2.8°C	102 mm	9.1	13 h 16	35	Good coverage
May	21.4°C	8.5°C	88 mm	10.3	14 h 30	66	Good coverage
June	25.7°C	13.6°C	109 mm	8.7	15 h 11	76	Good coverage
July	28.4°C	16.8°C	84 mm	8.4	14 h 55	70	Good coverage
August	27.7°C	16°C	85 mm	7.3	13 h 51	75	Good coverage
September	24°C	11.7°C	104 mm	7.1	12 h 25	80	Good coverage
October	17.3°C	5.3°C	103 mm	8.6	11 h 01	46	Good coverage
November	11.3°C	-0.1°C	82 mm	7.7	9 h 46	20	Good coverage
December	5.6°C	-4.3°C	95 mm	8.6	9 h 10	5	Good coverage

Records at WILLIMANTIC WINDHAM AP, 1996–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	21.1°C6 Jan 2007	-25.0°C31 Jan 2026	56 mm3 Jan 1999	185 mm1999 · driest 16 mm in 2026	30
February	22.2°C24 Feb 2017	-26.6°C21 Feb 2015	62 mm13 Feb 2008	205 mm2008 · driest 11 mm in 2026	30
March	30.0°C31 Mar 1998	-21.7°C7 Mar 2003	65 mm29 Mar 2010	240 mm2010 · driest 16 mm in 2006	30
April	34.4°C17 Apr 2002	-7.7°C6 Apr 2016	78 mm13 Apr 2004	199 mm2007 · driest 30 mm in 1999	30
May	36.1°C18 May 2017	-2.2°C7 May 2001	75 mm31 May 2015	183 mm2025 · driest 22 mm in 2022	30
June	36.7°C24 Jun 2025	3.3°C1 Jun 2001	100 mm17 Jun 2001	259 mm1998 · driest 3 mm in 1999	30
July	37.8°C22 Jul 2011	8.3°C11 Jul 2002	85 mm2 Jul 2009	291 mm2023 · driest 26 mm in 2015	31
August	38.3°C9 Aug 2001	7.2°C21 Aug 2000	100 mm28 Aug 2011	309 mm2011 · driest 14 mm in 2020	30
September	35.6°C8 Sep 2015	-1.0°C22 Sep 2020	116 mm25 Sep 2018	322 mm2023 · driest 28 mm in 2020	30
October	29.4°C5 Oct 2025	-6.7°C23 Oct 1997	88 mm28 Oct 2006	308 mm2005 · driest 8 mm in 2024	30
November	26.7°C1 Nov 2024	-15.0°C28 Nov 2002	58 mm27 Nov 2013	179 mm2018 · driest 24 mm in 2012	30
December	24.4°C7 Dec 1998	-21.1°C15 Dec 2005	79 mm18 Dec 2023	207 mm2023 · driest 31 mm in 2021	30

Typical days per month at WILLIMANTIC WINDHAM AP, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	28	2
February	0	0	25	2
March	<1	0	23	3
April	2	<1	9	3
May	8	2	<1	3
June	18	6	0	3
July	26	10	0	3
August	25	8	0	2
September	13	2	<1	3
October	2	0	6	3
November	<1	0	17	3
December	0	0	25	3

How often, not how much — every day in WILLIMANTIC WINDHAM AP’s record sorted by what it was actually like, rather than averaged
Month	Warm & dry days	Wet days	Washouts	Week with 3+ wet days	Daytime mean has ranged
January	0%	24%	7%	24%	0.0–5.7°C
February	<1%	26%	7%	28%	1.5–7.1°C
March	4%	27%	9%	32%	5.9–12.3°C
April	19%	30%	10%	36%	13.1–17.6°C
May	48%	32%	9%	37%	19.4–23.4°C
June	69%	28%	11%	33%	24.3–27.4°C
July	72%	28%	11%	29%	26.3–29.9°C
August	75%	24%	8%	22%	26.1–29.3°C
September	68%	24%	12%	23%	22.6–25.5°C
October	26%	26%	10%	28%	15.9–19.2°C
November	6%	25%	9%	21%	8.9–14.2°C
December	<1%	27%	10%	29%	2.9–8.2°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.

1997Each stripe is one year’s mean temperature against the 29-year average. Warmest: 2012. Coolest: 2004.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4843350
NOAA station: USW00054767 · WILLIMANTIC WINDHAM AP
Station distance: 7.1 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 22 usable years
Daylight: Calculated from latitude 41.68°, 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.

These places read the same station, so their numbers are identical — distance from WILLIMANTIC WINDHAM AP is what differs

Windham→Willimantic→Hebron→Colchester→Mansfield Center→Exeter→

Or put two places side by side: South Windham vs Windham

Best time to visitSouth Windham.

September

July

May

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
South Windham.

The whole year,
without the guesswork.

Nearby, measured,
and named.