United States · 1991–2020

Best time to visit
Marion.

September leads for comfortable weather in Marion: typically 25°C by day, 12.1°C at night, with 102 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high25°C

Typical low12.1°C

Rain in September102 mm

Comfort

September

September · May · August

79climate match

Beach

July

July · August · June

71climate match

Outdoors

October

October · May · September

74climate match

The weakest month is January, scoring 5 against September’s 79 — days reach only -1.3°C, 25° 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

5-1.3° / -10.3°

Feb

51.5° / -8.1°

Mar

159.2° / -2°

Apr

4317.2° / 4.1°

May

6923° / 10.3°

Jun

6427.8° / 15.8°

Jul

6129.6° / 17.9°

Aug

6728.4° / 16.7°

Sep

7925° / 12.1°

Oct

5317.7° / 5.7°

Nov

158.8° / -1°

Dec

51.4° / -7°

Monthly climate evidence for Marion — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	-1.3°C	-10.3°C	29 mm	5.7	9 h 26	5	Strong coverage
February	1.5°C	-8.1°C	34 mm	5.2	10 h 30	5	Strong coverage
March	9.2°C	-2°C	51 mm	6.9	11 h 48	15	Strong coverage
April	17.2°C	4.1°C	102 mm	9.4	13 h 17	43	Strong coverage
May	23°C	10.3°C	122 mm	10.5	14 h 32	69	Strong coverage
June	27.8°C	15.8°C	144 mm	10.7	15 h 13	64	Strong coverage
July	29.6°C	17.9°C	114 mm	7.5	14 h 57	61	Strong coverage
August	28.4°C	16.7°C	113 mm	7.7	13 h 52	67	Strong coverage
September	25°C	12.1°C	102 mm	7	12 h 26	79	Strong coverage
October	17.7°C	5.7°C	76 mm	7.2	11 h	53	Strong coverage
November	8.8°C	-1°C	56 mm	6.2	9 h 45	15	Strong coverage
December	1.4°C	-7°C	42 mm	6.4	9 h 08	5	Strong coverage

What has changed

Marion runs +1.3°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

+1.3

Feb

+0.6

Mar

+2.4

Apr

+0.7

May

+0.9

Jun

+1.4

Jul

+0.5

Aug

+0.7

Sep

+2.4

Oct

+0.7

Nov

+0.9

Dec

+2.7

September daytime highs, 2011–2025. Last recorded: 27.8°C.

Records at CEDAR RAPIDS #1, 1892–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	20.0°C31 Jan 1989	-36.1°C16 Jan 2009	74 mm12 Jan 1960	119 mm1960 · driest 2 mm in 1925	132
February	24.4°C22 Feb 2017	-33.3°C2 Feb 1996	64 mm9 Feb 1898	93 mm1898 · driest 1 mm in 1995	132
March	31.7°C21 Mar 2026	-27.2°C1 Mar 1962	66 mm31 Mar 1998	162 mm1951 · driest 0 mm in 1910	132
April	34.4°C22 Apr 1925	-16.1°C6 Apr 1982	84 mm8 Apr 1896	213 mm2013 · driest 4 mm in 1946	134
May	40.0°C31 May 1934	-4.4°C7 May 1925	86 mm26 May 1986	257 mm1892 · driest 1 mm in 1923	135
June	39.4°C27 Jun 1934	2.2°C4 Jun 1945	121 mm4 Jun 2002	306 mm1969 · driest 13 mm in 1922	134
July	43.3°C6 Jul 1911	5.6°C2 Jul 1924	168 mm5 Jul 1993	432 mm1993 · driest 5 mm in 1894	134
August	42.2°C3 Aug 1930	2.8°C30 Aug 1915	120 mm5 Aug 1968	331 mm2009 · driest 7 mm in 1947	133
September	40.6°C4 Sep 1925	-5.6°C30 Sep 1899	198 mm15 Sep 1914	391 mm1914 · driest 2 mm in 2024	133
October	34.4°C3 Oct 1997	-18.9°C30 Oct 1925	72 mm2 Oct 2019	186 mm2009 · driest 0 mm in 1952	131
November	26.7°C8 Nov 1999	-23.3°C26 Nov 1977	67 mm2 Nov 1961	163 mm1931 · driest 2 mm in 1904	131
December	20.6°C16 Dec 2021	-33.3°C28 Dec 1924	48 mm15 Dec 1971	114 mm2015 · driest 4 mm in 1976	131

Typical days per month at CEDAR RAPIDS #1, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	30	<1	7
February	0	0	25	<1	5
March	<1	0	20	2	3
April	4	<1	7	4	1
May	12	3	<1	4	0
June	24	10	0	5	0
July	29	15	0	3	0
August	27	10	0	4	0
September	17	5	<1	3	0
October	4	<1	5	2	<1
November	<1	0	18	2	2
December	0	0	28	1	6

The best month has moved. On the 1961–1990 numbers the strongest month here was September (scoring 84); on 2011–2025 it is May (81). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in CEDAR RAPIDS #1’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%	17%	3%	12%	-5.9–1.9°C
February	<1%	17%	3%	12%	-3.7–5.5°C
March	7%	22%	6%	23%	4.0–12.4°C
April	24%	29%	10%	35%	13.0–19.7°C
May	51%	32%	11%	41%	19.9–25.7°C
June	67%	31%	13%	36%	25.3–30.1°C
July	76%	24%	10%	24%	28.0–32.4°C
August	76%	23%	10%	24%	26.6–31.0°C
September	65%	24%	10%	25%	22.5–27.5°C
October	34%	21%	7%	21%	15.5–21.2°C
November	5%	19%	6%	16%	5.2–11.6°C
December	0%	18%	4%	14%	-2.7–4.6°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.

1893Each stripe is one year’s mean temperature against the 129-year average. Warmest: 2012. Coolest: 1917.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4866263
NOAA station: USC00131319 · CEDAR RAPIDS #1
Station distance: 1.9 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 30 usable years
Daylight: Calculated from latitude 42.03°, 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 CEDAR RAPIDS #1 is what differs

Cedar Rapids→Hiawatha→Mount Vernon→Robins→Lisbon→Springville→

Or put two places side by side: Marion vs Cedar Rapids

Best time to visitMarion.

September

July

October

The whole year,without the guesswork.

Marion runs +1.3°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Marion.

The whole year,
without the guesswork.

Marion runs +1.3°C
on the 1961–1990 baseline.

Nearby, measured,
and named.