Grinnell Weather History Iowa, United States of America

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Daily and hourly data from 1 Jan 2009 onwards.
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Thu 13 Aug, 2026 Weather in Grinnell

Sunrise: 06:17 AM Sunset: 08:14 PM	Moonrise: 07:01 AM Moonset: 08:43 PM	Max: 26.7 °c	Min: 20.7 °c	Avg: 23.4 °c	Precip: 36.65 mm	Max Wind: 17.6 kph

	Thu 13 0:00 am	Thu 13 3:00 am	Thu 13 6:00 am	Thu 13 9:00 am	Thu 13 12:00 pm	Thu 13 3:00 pm	Thu 13 6:00 pm	Thu 13 9:00 pm
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Temp	22.2°c	21.0°c	22.7°c	22.4°c	23.2°c	24.9°c	25.8°c	23.6°c
Wind	15.0 kmph	8.6 kmph	13.3 kmph	13.7 kmph	15.0 kmph	8.3 kmph	7.6 kmph	14.0 kmph
Precip	0.00 mm	0.00 mm	0.60 mm	10.92 mm	1.20 mm	0.20 mm	3.20 mm	0.40 mm
Cloud	2%	2%	88%	86%	73%	100%	78%	79%
Humidity	90%	91%	95%	98%	90%	85%	76%	80%
Pressure	1009 mb	1010 mb	1010 mb	1012 mb	1010 mb	1010 mb	1011 mb	1012 mb

Grinnell Annual Weather Averages

Month	High Temp	Low Temp	Avg Temp	Sunshine Hours	Rainfall	Rain days	Pressure
January	-3°C / 27°F	-10°C / 14°F	-6°C / 21°F	127 hours	37.65 mm / 1.48 In	7 days	1021 mb / 31 In
February	0°C / 32°F	-8°C / 17°F	-4°C / 25°F	125 hours	34.61 mm / 1.36 In	5 days	1020 mb / 31 In
March	9°C / 47°F	0°C / 31°F	4°C / 39°F	145 hours	84.83 mm / 3.34 In	6 days	1017 mb / 31 In
April	15°C / 59°F	5°C / 41°F	10°C / 50°F	153 hours	138.05 mm / 5.43 In	8 days	1014 mb / 30 In
May	21°C / 69°F	11°C / 52°F	16°C / 61°F	164 hours	152.14 mm / 5.99 In	9 days	1014 mb / 30 In
June	26°C / 79°F	17°C / 63°F	22°C / 71°F	196 hours	163.37 mm / 6.43 In	8 days	1012 mb / 30 In
July	28°C / 82°F	19°C / 65°F	23°C / 74°F	217 hours	103.05 mm / 4.06 In	6 days	1014 mb / 30 In
August	28°C / 82°F	17°C / 63°F	22°C / 72°F	232 hours	121.84 mm / 4.80 In	6 days	1015 mb / 30 In
September	25°C / 76°F	14°C / 57°F	19°C / 66°F	242 hours	99.96 mm / 3.94 In	5 days	1016 mb / 30 In
October	16°C / 62°F	7°C / 45°F	12°C / 53°F	201 hours	97.01 mm / 3.82 In	5 days	1016 mb / 30 In
November	9°C / 47°F	0°C / 33°F	4°C / 40°F	194 hours	66.86 mm / 2.63 In	5 days	1019 mb / 31 In
December	1°C / 35°F	-5°C / 22°F	-2°C / 28°F	152 hours	58.56 mm / 2.31 In	6 days	1019 mb / 31 In

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