United States · 1991–2020

Best time to visit
Keokuk.

September leads for comfortable weather in Keokuk: typically 25.5°C by day, 13.7°C at night, with 88 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high25.5°C

Typical low13.7°C

Rain in September88 mm

Comfort

September

September · May · August

83climate match

Beach

August

August · July · June

78climate match

Outdoors

October

October · April · September

79climate match

The weakest month is January, scoring 5 against September’s 83 — 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° / -8.3°

Feb

53.6° / -6.3°

Mar

1810.2° / -0.6°

Apr

4517.2° / 5.4°

May

7023° / 11.7°

Jun

6028.1° / 17.2°

Jul

5830.1° / 19.5°

Aug

6529.2° / 18.5°

Sep

8325.5° / 13.7°

Oct

5818.6° / 7.1°

Nov

2210.5° / 0.5°

Dec

53.7° / -5.1°

Monthly climate evidence for Keokuk — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	0.9°C	-8.3°C	42 mm	5.7	9 h 35	5	Strong coverage
February	3.6°C	-6.3°C	45 mm	5.6	10 h 36	5	Strong coverage
March	10.2°C	-0.6°C	65 mm	6.9	11 h 49	18	Strong coverage
April	17.2°C	5.4°C	106 mm	9.1	13 h 13	45	Strong coverage
May	23°C	11.7°C	133 mm	10.6	14 h 24	70	Strong coverage
June	28.1°C	17.2°C	152 mm	9.3	15 h 02	60	Strong coverage
July	30.1°C	19.5°C	107 mm	7.8	14 h 47	58	Strong coverage
August	29.2°C	18.5°C	96 mm	6.5	13 h 46	65	Strong coverage
September	25.5°C	13.7°C	88 mm	5.9	12 h 25	83	Strong coverage
October	18.6°C	7.1°C	84 mm	6.2	11 h 03	58	Strong coverage
November	10.5°C	0.5°C	65 mm	6.2	9 h 53	22	Strong coverage
December	3.7°C	-5.1°C	50 mm	5.8	9 h 18	5	Strong coverage

What has changed

Keokuk runs -0.1°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

+0.1

Feb

-0.2

Mar

+0.4

Apr

-1.0

May

-0.5

Jun

-0.2

Jul

-1.1

Aug

-0.8

Sep

+0.5

Oct

-0.5

Nov

-0.3

Dec

+2.0

September daytime highs, 2011–2025. Last recorded: 26.9°C.

Records at KEOKUK L&D 19, 1933–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	21.1°C21 Jan 1957	-30.0°C10 Jan 1982	88 mm2 Jan 1965	218 mm1965 · driest 1 mm in 1986	86
February	25.6°C28 Feb 2024	-28.3°C9 Feb 1979	81 mm21 Feb 1997	127 mm1997 · driest 1 mm in 2026	85
March	31.1°C27 Mar 2026	-23.9°C6 Mar 1960	119 mm4 Mar 1985	188 mm1985 · driest 9 mm in 1956	86
April	33.3°C25 Apr 1986	-11.7°C3 Apr 2018	132 mm18 Apr 2013	250 mm2026 · driest 17 mm in 1985	87
May	38.9°C31 May 1934	0.6°C6 May 1989	117 mm27 May 1973	363 mm1995 · driest 16 mm in 1964	87
June	40.0°C19 Jun 1936	6.7°C5 Jun 1993	119 mm25 Jun 1968	417 mm2011 · driest 4 mm in 1963	86
July	45.0°C15 Jul 1936	10.0°C30 Jul 1971	99 mm9 Jul 2003	321 mm1993 · driest 0 mm in 1936	84
August	43.3°C9 Aug 1934	6.7°C28 Aug 1986	137 mm23 Aug 2001	254 mm1970 · driest 0 mm in 2013	85
September	38.9°C2 Sep 2011	-1.1°C23 Sep 1992	122 mm14 Sep 1961	323 mm1970 · driest 0 mm in 1979	85
October	34.4°C4 Oct 2006	-6.7°C19 Oct 1972	107 mm3 Oct 1986	287 mm1941 · driest 3 mm in 1964	84
November	27.8°C1 Nov 1950	-19.4°C30 Nov 1964	82 mm30 Nov 2006	209 mm1985 · driest 7 mm in 1989	84
December	22.8°C4 Dec 2012	-28.9°C24 Dec 1989	90 mm10 Dec 2003	145 mm1982 · driest 3 mm in 1976	85

Typical days per month at KEOKUK L&D 19, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	28	1	2
February	0	0	24	1	2
March	1	0	18	2	<1
April	4	<1	4	4	<1
May	12	3	0	4	0
June	24	12	0	4	0
July	29	17	0	3	0
August	28	13	0	3	0
September	17	6	<1	3	0
October	6	<1	2	3	0
November	<1	0	15	2	<1
December	0	0	25	2	1

The best month has moved. On the 1961–1990 numbers the strongest month here was May (scoring 82); on 2011–2025 it is September (87). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in KEOKUK L&D 19’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	<1%	18%	4%	14%	-2.3–5.1°C
February	1%	19%	4%	15%	-0.6–7.7°C
March	9%	24%	7%	26%	6.7–13.8°C
April	27%	30%	10%	36%	14.7–20.5°C
May	54%	31%	12%	39%	20.7–26.0°C
June	71%	27%	12%	31%	26.4–30.7°C
July	75%	24%	10%	22%	28.3–32.9°C
August	78%	22%	9%	19%	27.7–31.5°C
September	71%	23%	11%	23%	23.6–27.8°C
October	40%	20%	7%	20%	16.8–21.5°C
November	8%	20%	6%	17%	7.5–13.3°C
December	<1%	19%	4%	15%	0.6–7.0°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.

1933Each stripe is one year’s mean temperature against the 76-year average. Warmest: 1987. Coolest: 2014.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4863349
NOAA station: USC00134381 · KEOKUK L&D 19
Station distance: 0.8 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 29 usable years
Daylight: Calculated from latitude 40.40°, 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 KEOKUK L&D 19 is what differs

Hamilton→Warsaw→Wayland→Saint Francisville→Elvaston→Alexandria→

Or put two places side by side: Keokuk vs Hamilton

Best time to visitKeokuk.