United States · 1991–2020

Best time to visit
Wheaton.

September leads for comfortable weather in Wheaton: typically 25.7°C by day, 11.7°C at night, with 81 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high25.7°C

Typical low11.7°C

Rain in September81 mm

Comfort

September

September · May · June

79climate match

Beach

July

July · August · June

70climate match

Outdoors

October

October · May · September

77climate match

The weakest month is January, scoring 5 against September’s 79 — days reach only 1.2°C, 23° 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

51.2° / -7.9°

Feb

54° / -6.2°

Mar

1610.2° / -2.2°

Apr

4417.7° / 3.6°

May

7123.4° / 8.9°

Jun

6828.7° / 14.3°

Jul

6230.5° / 17.4°

Aug

6529.4° / 16.7°

Sep

7925.7° / 11.7°

Oct

5719.2° / 5.9°

Nov

1810.4° / 0°

Dec

53.7° / -5.3°

Monthly climate evidence for Wheaton — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 40 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	1.2°C	-7.9°C	57 mm	8	3.3°C	9 h 27	5	Good coverage
February	4°C	-6.2°C	43 mm	5.9	2.0°C	10 h 31	5	Good coverage
March	10.2°C	-2.2°C	58 mm	7.6	2.0°C	11 h 48	16	Good coverage
April	17.7°C	3.6°C	98 mm	9.5	3.8°C	13 h 17	44	Good coverage
May	23.4°C	8.9°C	106 mm	10.1	7.1°C	14 h 31	71	Good coverage
June	28.7°C	14.3°C	107 mm	8.9	14.1°C	15 h 12	68	Good coverage
July	30.5°C	17.4°C	95 mm	7.4	20.9°C	14 h 56	62	Good coverage
August	29.4°C	16.7°C	106 mm	7.7	22.5°C	13 h 52	65	Good coverage
September	25.7°C	11.7°C	81 mm	6.8	20.1°C	12 h 26	79	Good coverage
October	19.2°C	5.9°C	88 mm	6.9	14.5°C	11 h 00	57	Good coverage
November	10.4°C	0°C	81 mm	7.4	9.2°C	9 h 45	18	Good coverage
December	3.7°C	-5.3°C	49 mm	6.8	5.6°C	9 h 09	5	Good coverage

Records at WHEATON 3 SE, 1895–2007
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	18.3°C31 Jan 1989	-32.2°C20 Jan 1985	73 mm12 Jan 1960	141 mm1960 · driest 3 mm in 1981	69
February	23.3°C25 Feb 2000	-29.4°C6 Feb 1977	72 mm21 Feb 1997	142 mm1997 · driest 0 mm in 1987	67
March	29.4°C29 Mar 1986	-24.4°C8 Mar 1943	86 mm19 Mar 1948	184 mm1948 · driest 10 mm in 1958	68
April	32.8°C30 Apr 1942	-15.6°C7 Apr 1982	142 mm5 Apr 1947	239 mm1947 · driest 17 mm in 1971	69
May	35.0°C20 May 1938	-3.9°C10 May 1966	96 mm10 May 1990	212 mm1990 · driest 1 mm in 1992	67
June	39.4°C25 Jun 1988	0.0°C11 Jun 1972	103 mm21 Jun 1939	271 mm1939 · driest 14 mm in 1991	68
July	40.6°C14 Jul 1995	5.0°C6 Jul 1967	235 mm18 Jul 1996	304 mm1996 · driest 3 mm in 1946	69
August	37.8°C2 Aug 1991	3.3°C18 Aug 1963	153 mm14 Aug 1987	395 mm1987 · driest 14 mm in 1953	69
September	38.9°C15 Sep 1939	-3.3°C28 Sep 1942	85 mm7 Sep 1998	285 mm1961 · driest 0 mm in 1979	70
October	32.2°C6 Oct 1963	-10.0°C30 Oct 1988	142 mm10 Oct 1954	276 mm1954 · driest 4 mm in 1964	67
November	25.6°C1 Nov 1950	-20.0°C24 Nov 1950	76 mm11 Nov 1995	183 mm1985 · driest 10 mm in 1999	68
December	21.1°C5 Dec 2001	-29.4°C24 Dec 1983	77 mm3 Dec 1982	156 mm1982 · driest 0 mm in 1943	69

Typical days per month at WHEATON 3 SE, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	27	2	6
February	0	0	24	1	3
March	<1	0	21	2	2
April	4	<1	8	3	<1
May	12	4	1	3	0
June	24	13	0	3	0
July	30	18	0	3	0
August	28	15	0	4	0
September	18	6	<1	3	0
October	6	<1	5	3	0
November	<1	0	15	2	<1
December	0	0	25	2	3

How often, not how much — every day in WHEATON 3 SE’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%	22%	5%	19%	-4.4–2.6°C
February	<1%	22%	4%	19%	-1.0–6.8°C
March	7%	26%	7%	29%	4.6–12.2°C
April	24%	30%	10%	36%	13.6–19.3°C
May	52%	30%	11%	35%	20.1–25.7°C
June	69%	29%	12%	31%	25.6–30.0°C
July	76%	24%	9%	23%	28.4–31.9°C
August	77%	23%	10%	21%	27.1–31.1°C
September	70%	23%	10%	21%	23.0–27.2°C
October	37%	20%	7%	21%	16.0–21.6°C
November	5%	26%	8%	25%	6.2–12.4°C
December	<1%	22%	6%	21%	-1.7–5.5°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.

1937Each stripe is one year’s mean temperature against the 58-year average. Warmest: 1998. Coolest: 1972.2006

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4916288
NOAA station: USC00119221 · WHEATON 3 SE
Station distance: 6.6 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 15 usable years
Daylight: Calculated from latitude 41.87°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 40 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.

These places read the same station, so their numbers are identical — distance from WHEATON 3 SE is what differs

Downers Grove→Glen Ellyn→Westmont→Darien→Hinsdale→Warrenville→

Or put two places side by side: Wheaton vs Downers Grove

Best time to visitWheaton.