Marshalltown, Iowa Climate

United States

Pop. 27,620 Elev. 289 m / 948 ft TZ: America/Chicago (UTC-5) ·

Dry and warm, Marshalltown sees July highs of 84°F (29°C) and cold January lows of 13°F (-11°C). Humidity pushes the summer feels-like temperature to 95°F (35°C), while wind chill can drive winter lows to 3°F (-16°C). Expect around 45 rainy days annually (32.6 in / 829 mm total), with snow on 5 days and 33 in (835 mm) of annual accumulation. The city averages 130 sunny days per year and around 36 thunderstorm days. Nearby lake water reaches 80°F (27°C) in summer.

Temperature 84°F (29°C) high 13°F (-11°C) low
Feels like 95°F (35°C) high 3°F (-16°C) low
Rain 45 days 32.6 in (829 mm) /yr
Snow 5 days 32.9 in (835 mm) /yr
Sky 130 sunny 36 stormy
Wind 2.7 mph (1.2 m/s) avg

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Monthly Climate Chart

↓ Monthly data table
Best months to visit: May, Aug, Sep, Oct

Sky & Air by Month

Cloud cover (%)
44
Jan
58
Feb
48
Mar
65
Apr
52
May
51
Jun
59
Jul
51
Aug
47
Sep
45
Oct
55
Nov
70
Dec
Humidity (%)
61
Jan
65
Feb
58
Mar
58
Apr
58
May
67
Jun
80
Jul
77
Aug
66
Sep
64
Oct
68
Nov
79
Dec

Weather Days by Month

↓ Weather days table

Water Temperatures

↓ Water temperatures table

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Nearby Cities

Nearby

Commercial airport 44 mi Waterloo Regional Airport (ALO)
Ski resort 45 mi
National park 110 mi Effigy Mounds National Monument
Hospital 0 mi Central Iowa Healthcare
Hiking trail 21 mi ADT - Iowa - K - Seg 3

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Monthly Weather Data

↑ See chart
Month Avg High Avg Low Rainfall Snowfall Sunny Days
January 31°F -1°C 13°F -11°C 0.2 in 6 mm 2.4 in61 mm 13
February 32°F 0°C 15°F -10°C 0.0 in 0 mm 5.7 in145 mm 9
March 59°F 15°C 34°F 1°C 3.9 in 98 mm 6.7 in169 mm 13
April 63°F 17°C 43°F 6°C 4.3 in 108 mm 6
May 72°F 22°C 51°F 11°C 2.3 in 58 mm 12
June 84°F 29°C 65°F 18°C 5.2 in 133 mm 12
July 84°F 29°C 68°F 20°C 9.4 in 238 mm 10
August 80°F 27°C 63°F 17°C 1.8 in 45 mm 12
September 79°F 26°C 57°F 14°C 2.1 in 53 mm 14
October 68°F 20°C 49°F 9°C 2.4 in 60 mm 15
November 50°F 10°C 33°F 1°C 0.8 in 20 mm 10.2 in258 mm 10
December 32°F 0°C 15°F -9°C 0.4 in 10 mm 7.9 in201 mm 4

Weather Days by Month

↑ See chart
Month Sunny Days Storm Days
January 13 1
February 9 0
March 13 4
April 6 4
May 12 2
June 12 7
July 10 9
August 12 2
September 14 4
October 15 2
November 10 1
December 4 0

Water Temperatures Data

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Month Lake Avg High
January 32°F 0°C
February 32°F 0°C
March 41°F 5°C
April 53°F 12°C
May 62°F 17°C
June 74°F 23°C
July 80°F 27°C
August 76°F 24°C
September 70°F 21°C
October 59°F 15°C
November 43°F 6°C
December 32°F 0°C