Decatur Weather History Illinois, United States of America

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Past date: Past date must be from 1st Jan, 2009 onwards.

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Daily and hourly data from 1 Jan 2009 onwards.
Yearly Monthly Averages
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Fri 04 Sep, 2026 Weather in Decatur

Sunrise: 06:26 AM Sunset: 07:23 PM	Moonrise: 11:25 PM Moonset: 02:30 PM	Max: 37.9 °c	Min: 23.4 °c	Avg: 30.0 °c	Precip: 0.00 mm	Max Wind: 17.3 kph

	Fri 04 0:00 am	Fri 04 3:00 am	Fri 04 6:00 am	Fri 04 9:00 am	Fri 04 12:00 pm	Fri 04 3:00 pm	Fri 04 6:00 pm	Fri 04 9:00 pm
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Temp	25.2°c	24.1°c	23.4°c	29.1°c	36.7°c	37.7°c	34.9°c	29.2°c
Wind	13.0 kmph	14.0 kmph	12.2 kmph	16.2 kmph	12.6 kmph	11.5 kmph	15.1 kmph	11.9 kmph
Precip	0.00 mm	0.00 mm	0.00 mm	0.00 mm	0.00 mm	0.00 mm	0.00 mm	0.00 mm
Cloud	0%	0%	0%	0%	1%	10%	2%	0%
Humidity	76%	81%	80%	65%	49%	41%	40%	58%
Pressure	1013 mb	1012 mb	1014 mb	1015 mb	1014 mb	1012 mb	1010 mb	1011 mb

Decatur Annual Weather Averages

Month	High Temp	Low Temp	Avg Temp	Sunshine Hours	Rainfall	Rain days	Pressure
January	1°C / 34°F	-6°C / 21°F	-3°C / 27°F	132 hours	63.31 mm / 2.49 In	7 days	1021 mb / 31 In
February	4°C / 39°F	-4°C / 24°F	0°C / 31°F	131 hours	70.46 mm / 2.77 In	6 days	1020 mb / 31 In
March	11°C / 52°F	2°C / 36°F	7°C / 44°F	154 hours	117.35 mm / 4.62 In	8 days	1018 mb / 31 In
April	17°C / 62°F	7°C / 45°F	12°C / 54°F	158 hours	169.69 mm / 6.68 In	7 days	1014 mb / 30 In
May	22°C / 72°F	13°C / 56°F	18°C / 64°F	167 hours	138.54 mm / 5.45 In	9 days	1015 mb / 30 In
June	27°C / 81°F	18°C / 64°F	23°C / 73°F	208 hours	139.19 mm / 5.48 In	8 days	1013 mb / 30 In
July	28°C / 83°F	19°C / 67°F	24°C / 75°F	207 hours	129.27 mm / 5.09 In	8 days	1015 mb / 30 In
August	28°C / 82°F	18°C / 65°F	23°C / 73°F	219 hours	104.61 mm / 4.12 In	7 days	1015 mb / 30 In
September	26°C / 78°F	15°C / 59°F	20°C / 68°F	236 hours	102.55 mm / 4.04 In	5 days	1017 mb / 31 In
October	19°C / 65°F	9°C / 48°F	14°C / 56°F	207 hours	95.48 mm / 3.76 In	7 days	1017 mb / 31 In
November	11°C / 51°F	2°C / 36°F	6°C / 43°F	191 hours	89.27 mm / 3.51 In	5 days	1020 mb / 31 In
December	5°C / 40°F	-2°C / 29°F	1°C / 34°F	145 hours	74.83 mm / 2.95 In	7 days	1020 mb / 31 In

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