United States · 1991–2020

Best time to visit
Washington.

September leads for comfortable weather in Washington: typically 26.7°C by day, 11.6°C at night, with 81 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high26.7°C

Typical low11.6°C

Rain in September81 mm

Comfort

September

September · June · May

76climate match

Beach

July

July · August · June

72climate match

Outdoors

October

October · May · September

75climate match

The weakest month is January, scoring 5 against September’s 76 — days reach only 0.9°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

50.9° / -9.3°

Feb

53.4° / -7.2°

Mar

1610.2° / -1.8°

Apr

4517.5° / 4°

May

6923.1° / 10.1°

Jun

7227.9° / 15.5°

Jul

6429.7° / 17.3°

Aug

6929° / 15.9°

Sep

7626.7° / 11.6°

Oct

5519.2° / 4.9°

Nov

2111.1° / -0.7°

Dec

53.6° / -6.3°

Monthly climate evidence for Washington — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	0.9°C	-9.3°C	53 mm	6.5	9 h 33	5	Good coverage
February	3.4°C	-7.2°C	45 mm	5.9	10 h 35	5	Good coverage
March	10.2°C	-1.8°C	62 mm	7.4	11 h 49	16	Strong coverage
April	17.5°C	4°C	96 mm	9.2	13 h 14	45	Good coverage
May	23.1°C	10.1°C	122 mm	10.6	14 h 25	69	Strong coverage
June	27.9°C	15.5°C	102 mm	8.9	15 h 04	72	Strong coverage
July	29.7°C	17.3°C	95 mm	7.7	14 h 49	64	Strong coverage
August	29°C	15.9°C	95 mm	7.7	13 h 47	69	Strong coverage
September	26.7°C	11.6°C	81 mm	6	12 h 25	76	Strong coverage
October	19.2°C	4.9°C	80 mm	8.2	11 h 03	55	Strong coverage
November	11.1°C	-0.7°C	66 mm	6.9	9 h 51	21	Strong coverage
December	3.6°C	-6.3°C	53 mm	6.4	9 h 16	5	Good coverage

Records at CONGERVILLE 2NW, 1996–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	18.9°C8 Jan 2008	-37.8°C5 Jan 1999	79 mm8 Jan 2008	105 mm2005 · driest 10 mm in 2009	30
February	25.0°C28 Feb 2024	-30.6°C11 Feb 2014	42 mm27 Feb 1997	98 mm2008 · driest 1 mm in 2026	30
March	30.6°C27 Mar 2026	-21.1°C3 Mar 2014	50 mm31 Mar 2022	153 mm2007 · driest 17 mm in 2015	31
April	32.2°C19 Apr 2002	-13.9°C2 Apr 2018	73 mm4 Apr 2026	193 mm2026 · driest 42 mm in 2023	30
May	35.6°C28 May 2018	-5.0°C3 May 2005	78 mm31 May 2008	257 mm2019 · driest 35 mm in 2005	31
June	37.2°C29 Jun 2012	1.7°C1 Jun 2003	86 mm18 Jun 2017	273 mm2015 · driest 24 mm in 2005	31
July	40.0°C8 Jul 2012	7.8°C24 Jul 2000	125 mm16 Jul 2020	214 mm2020 · driest 11 mm in 2012	31
August	37.8°C25 Aug 2023	4.4°C14 Aug 2004	73 mm17 Aug 1997	204 mm2016 · driest 17 mm in 2025	30
September	37.8°C2 Sep 2011	-1.1°C24 Sep 2012	95 mm14 Sep 2008	153 mm2008 · driest 4 mm in 2025	30
October	33.9°C4 Oct 2006	-6.7°C24 Oct 1999	77 mm31 Oct 2013	254 mm2021 · driest 21 mm in 2005	30
November	27.8°C2 Nov 2000	-15.0°C12 Nov 2019	40 mm30 Nov 2006	131 mm2015 · driest 6 mm in 1999	30
December	22.2°C5 Dec 1998	-27.8°C25 Dec 2000	41 mm15 Dec 2011	147 mm2015 · driest 15 mm in 2017	29

Typical days per month at CONGERVILLE 2NW, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	28	2	5
February	0	0	25	1	4
March	1	0	20	2	2
April	4	<1	7	4	<1
May	13	4	<1	5	0
June	23	10	0	4	0
July	28	15	0	3	0
August	28	12	0	3	0
September	20	9	<1	2	0
October	7	1	6	3	0
November	<1	0	17	2	<1
December	0	0	26	2	3

How often, not how much — every day in CONGERVILLE 2NW’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%	21%	5%	16%	-1.9–3.7°C
February	1%	20%	4%	15%	-2.1–7.8°C
March	8%	23%	8%	25%	7.0–14.5°C
April	26%	31%	12%	42%	15.0–20.5°C
May	49%	34%	14%	43%	20.4–25.4°C
June	68%	29%	12%	33%	26.6–29.2°C
July	75%	25%	10%	27%	27.8–31.4°C
August	75%	24%	10%	24%	27.7–30.3°C
September	76%	19%	8%	18%	24.6–28.8°C
October	37%	27%	9%	30%	17.2–21.9°C
November	10%	22%	8%	21%	7.0–14.5°C
December	<1%	21%	6%	16%	0.7–7.2°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 28-year average. Warmest: 2016. Coolest: 2014.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4915545
NOAA station: USC00111836 · CONGERVILLE 2NW
Station distance: 16.7 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 24 usable years
Daylight: Calculated from latitude 40.70°, 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 CONGERVILLE 2NW is what differs

Morton→Eureka→Metamora→Mackinaw→Heritage Lake→Goodfield→

Or put two places side by side: Washington vs Morton

Best time to visitWashington.