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.
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Thu 04 Jun, 2026 Weather in Decatur

Sunrise: 05:28 AM Sunset: 08:19 PM	Moonrise: Does not rise today Moonset: 09:12 AM	Max: 29.7 °c	Min: 13.6 °c	Avg: 22.3 °c	Precip: 0.00 mm	Max Wind: 21.6 kph

	Thu 04 0:00 am	Thu 04 3:00 am	Thu 04 6:00 am	Thu 04 9:00 am	Thu 04 12:00 pm	Thu 04 3:00 pm	Thu 04 6:00 pm	Thu 04 9:00 pm
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Temp	16.6°c	14.7°c	15.2°c	22.9°c	28.0°c	28.5°c	27.9°c	23.1°c
Wind	11.9 kmph	10.8 kmph	11.2 kmph	14.4 kmph	16.6 kmph	19.8 kmph	14.0 kmph	13.0 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	1%	0%	2%	0%	6%	17%	8%	0%
Humidity	69%	73%	81%	51%	44%	43%	41%	60%
Pressure	1022 mb	1022 mb	1022 mb	1022 mb	1020 mb	1018 mb	1016 mb	1016 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	176 hours	142.63 mm / 5.62 In	10 days	1015 mb / 30 In
June	27°C / 81°F	18°C / 64°F	23°C / 73°F	220 hours	138.24 mm / 5.44 In	9 days	1013 mb / 30 In
July	28°C / 83°F	19°C / 67°F	24°C / 75°F	219 hours	131.19 mm / 5.17 In	8 days	1015 mb / 30 In
August	28°C / 82°F	18°C / 65°F	23°C / 73°F	232 hours	101.02 mm / 3.98 In	8 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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