United States · 1991–2020

Best time to visit
Wilmington.

September leads for comfortable weather in Wilmington: typically 25.3°C by day, 12.2°C at night, with 79 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high25.3°C

Typical low12.2°C

Rain in September79 mm

Comfort

September

September · June · August

82climate match

Beach

July

July · August · June

73climate match

Outdoors

October

October · May · September

75climate match

The weakest month is January, scoring 5 against September’s 82 — days reach only 0.4°C, 24° 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

50.4° / -8.7°

Feb

52.6° / -6.8°

Mar

169.5° / -1.5°

Apr

4316.6° / 4°

May

6922.3° / 9.6°

Jun

7527.2° / 15°

Jul

6429.5° / 17.6°

Aug

7128.2° / 16.7°

Sep

8225.3° / 12.2°

Oct

5518.1° / 5.8°

Nov

2511.1° / 0.7°

Dec

52.6° / -6.3°

Monthly climate evidence for Wilmington — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	0.4°C	-8.7°C	53 mm	7.4	9 h 30	5	Good coverage
February	2.6°C	-6.8°C	39 mm	5.5	10 h 33	5	Good coverage
March	9.5°C	-1.5°C	56 mm	7.2	11 h 48	16	Good coverage
April	16.6°C	4°C	90 mm	9	13 h 15	43	Good coverage
May	22.3°C	9.6°C	109 mm	9.2	14 h 28	69	Good coverage
June	27.2°C	15°C	106 mm	8	15 h 08	75	Good coverage
July	29.5°C	17.6°C	101 mm	6.9	14 h 53	64	Good coverage
August	28.2°C	16.7°C	99 mm	6.8	13 h 50	71	Good coverage
September	25.3°C	12.2°C	79 mm	5.9	12 h 25	82	Good coverage
October	18.1°C	5.8°C	74 mm	7	11 h 01	55	Good coverage
November	11.1°C	0.7°C	61 mm	6.7	9 h 48	25	Good coverage
December	2.6°C	-6.3°C	52 mm	7.1	9 h 12	5	Good coverage

Records at CHANNAHON DRESDEN ISL DAM, 1976–2013
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	18.9°C8 Jan 2008	-31.1°C5 Jan 1999	43 mm8 Jan 2008	127 mm2005 · driest 9 mm in 2003	16
February	22.8°C26 Feb 2000	-26.1°C11 Feb 2011	32 mm25 Feb 2001	71 mm2011 · driest 11 mm in 2004	15
March	30.0°C22 Mar 2012	-22.8°C5 Mar 2002	54 mm8 Mar 2009	162 mm2009 · driest 16 mm in 2008	16
April	33.9°C17 Apr 1976	-7.2°C10 Apr 1997	53 mm28 Apr 2009	162 mm2011 · driest 28 mm in 2012	17
May	36.1°C28 May 2012	-1.1°C1 May 1979	64 mm12 May 2002	170 mm2009 · driest 27 mm in 2007	17
June	37.2°C29 Jun 2012	4.4°C6 Jun 2003	52 mm25 Jun 2010	244 mm1999 · driest 45 mm in 2005	16
July	38.3°C8 Jul 2012	9.4°C27 Jul 1977	95 mm10 Jul 2000	201 mm2003 · driest 27 mm in 1997	17
August	36.7°C3 Aug 2011	7.2°C15 Aug 2004	105 mm24 Aug 2007	263 mm2007 · driest 40 mm in 2002	16
September	35.6°C12 Sep 2000	2.2°C25 Sep 2012	65 mm14 Sep 2008	312 mm2008 · driest 20 mm in 2004	16
October	32.8°C7 Oct 2007	-5.6°C28 Oct 1997	59 mm23 Oct 2009	183 mm2009 · driest 7 mm in 2005	16
November	25.6°C2 Nov 2000	-11.7°C23 Nov 2000	49 mm30 Nov 2006	112 mm2003 · driest 0 mm in 2009	16
December	21.7°C4 Dec 2012	-26.7°C25 Dec 2000	37 mm15 Dec 2005	109 mm2008 · driest 21 mm in 2002	16

Typical days per month at CHANNAHON DRESDEN ISL DAM, 1991–2020
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	1	4
March	1	<1	21	2	<1
April	4	<1	7	3	<1
May	10	3	<1	4	0
June	22	9	0	4	0
July	28	15	0	3	0
August	26	10	0	4	0
September	16	6	0	3	0
October	5	1	4	3	0
November	<1	0	14	2	<1
December	0	0	26	2	3

How often, not how much — every day in CHANNAHON DRESDEN ISL DAM’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%	4%	21%	-2.8–4.2°C
February	<1%	22%	4%	22%	-1.0–5.5°C
March	6%	26%	7%	31%	6.3–12.9°C
April	22%	31%	11%	38%	14.5–19.5°C
May	48%	31%	11%	38%	19.2–25.2°C
June	67%	27%	12%	29%	25.8–28.9°C
July	78%	23%	10%	22%	27.7–31.5°C
August	77%	22%	10%	19%	26.1–29.5°C
September	70%	21%	8%	21%	23.3–27.6°C
October	28%	21%	7%	21%	16.1–20.4°C
November	8%	23%	7%	23%	7.6–13.7°C
December	0%	24%	6%	26%	-0.8–6.4°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 4916740
NOAA station: USC00111420 · CHANNAHON DRESDEN ISL DAM
Station distance: 15.1 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 15 usable years
Daylight: Calculated from latitude 41.31°, 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 CHANNAHON DRESDEN ISL DAM is what differs

Channahon→Minooka→Braidwood→Coal City→Diamond→Central City→

Or put two places side by side: Wilmington vs Channahon

Best time to visitWilmington.