Decatur September Weather Averages Illinois, United States of America

September Weather Averages for Decatur

High Temp	26°C	78°F
Low Temp	15°C	59°F
Avg Temp	20°C	68°F
Sunshine Hours	238 hours
Rainfall	94.12 mm	3.71 In
Rain days	5 days
Pressure	1017 mb	31 In

Decatur September Averages Year by Year

Year	High Temp	Low Temp	Avg Temp	Sunshine Hours	Rainfall	Rain days	Pressure
2009	24°C / 76°F	14°C / 57°F	19°C / 66°F	252 hours	65.00 mm / 2.56 In	7 days	1018 mb / 31 In
2010	25°C / 77°F	15°C / 58°F	20°C / 67°F	259 hours	102.82 mm / 4.05 In	8 days	1015 mb / 30 In
2011	22°C / 72°F	13°C / 55°F	17°C / 63°F	202 hours	86.23 mm / 3.40 In	2 days	1016 mb / 30 In
2012	23°C / 73°F	13°C / 56°F	18°C / 64°F	231 hours	191.98 mm / 7.56 In	8 days	1016 mb / 30 In
2013	27°C / 80°F	15°C / 59°F	21°C / 69°F	301 hours	24.70 mm / 0.97 In	4 days	1016 mb / 30 In
2014	23°C / 74°F	13°C / 55°F	18°C / 64°F	237 hours	90.03 mm / 3.54 In	5 days	1018 mb / 31 In
2015	27°C / 80°F	16°C / 61°F	21°C / 70°F	206 hours	60.80 mm / 2.39 In	3 days	1017 mb / 31 In
2016	26°C / 78°F	17°C / 62°F	21°C / 70°F	233 hours	141.23 mm / 5.56 In	10 days	1017 mb / 31 In
2017	26°C / 80°F	15°C / 60°F	21°C / 69°F	291 hours	39.50 mm / 1.56 In	2 days	1017 mb / 31 In
2018	25°C / 78°F	17°C / 62°F	21°C / 70°F	210 hours	182.04 mm / 7.17 In	8 days	1018 mb / 31 In
2019	27°C / 80°F	18°C / 64°F	22°C / 72°F	235 hours	57.70 mm / 2.27 In	6 days	1017 mb / 31 In
2020	24°C / 75°F	14°C / 58°F	19°C / 66°F	195 hours	45.30 mm / 1.78 In	6 days	1017 mb / 31 In
2021	27°C / 81°F	16°C / 61°F	21°C / 71°F	262 hours	59.60 mm / 2.35 In	5 days	1015 mb / 30 In
2022	26°C / 79°F	15°C / 58°F	20°C / 68°F	231 hours	114.20 mm / 4.50 In	5 days	1017 mb / 31 In
2023	30°C / 86°F	14°C / 57°F	21°C / 70°F	231 hours	84.41 mm / 3.32 In	1 days	1017 mb / 30 In
2024	27°C / 81°F	15°C / 59°F	21°C / 69°F	227 hours	160.38 mm / 6.31 In	3 days	1016 mb / 30 In

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