Alton September Weather Averages Illinois, United States of America

September Weather Averages for Alton

High Temp	26°C	80°F
Low Temp	16°C	61°F
Avg Temp	21°C	70°F
Sunshine Hours	242 hours
Rainfall	87.48 mm	3.44 In
Rain days	5 days
Pressure	1016 mb	30 In

Alton September Averages Year by Year

Year	High Temp	Low Temp	Avg Temp	Sunshine Hours	Rainfall	Rain days	Pressure
2008	25°C / 77°F	15°C / 60°F	20°C / 67°F	229 hours	243.66 mm / 9.59 In	9 days	1018 mb / 31 In
2009	25°C / 78°F	15°C / 59°F	20°C / 68°F	259 hours	84.13 mm / 3.31 In	7 days	1017 mb / 31 In
2010	26°C / 78°F	16°C / 60°F	20°C / 68°F	262 hours	137.39 mm / 5.41 In	6 days	1015 mb / 30 In
2011	22°C / 72°F	13°C / 56°F	18°C / 64°F	221 hours	133.20 mm / 5.24 In	7 days	1016 mb / 30 In
2012	24°C / 75°F	15°C / 58°F	19°C / 66°F	209 hours	144.99 mm / 5.71 In	6 days	1016 mb / 30 In
2013	27°C / 81°F	16°C / 61°F	21°C / 71°F	285 hours	44.12 mm / 1.74 In	6 days	1015 mb / 30 In
2014	25°C / 76°F	14°C / 58°F	19°C / 66°F	227 hours	99.02 mm / 3.90 In	5 days	1018 mb / 31 In
2015	27°C / 81°F	17°C / 63°F	22°C / 71°F	212 hours	62.60 mm / 2.46 In	4 days	1017 mb / 31 In
2016	26°C / 79°F	17°C / 63°F	22°C / 71°F	245 hours	159.62 mm / 6.28 In	7 days	1017 mb / 31 In
2017	27°C / 81°F	17°C / 62°F	22°C / 71°F	276 hours	22.65 mm / 0.89 In	2 days	1017 mb / 31 In
2018	27°C / 80°F	18°C / 64°F	22°C / 72°F	230 hours	155.49 mm / 6.12 In	8 days	1018 mb / 31 In
2019	28°C / 82°F	19°C / 66°F	23°C / 74°F	251 hours	49.89 mm / 1.96 In	8 days	1016 mb / 30 In
2020	25°C / 77°F	16°C / 60°F	20°C / 68°F	235 hours	37.82 mm / 1.49 In	4 days	1017 mb / 31 In
2021	28°C / 83°F	18°C / 64°F	23°C / 73°F	251 hours	55.10 mm / 2.17 In	5 days	1015 mb / 30 In
2022	27°C / 81°F	16°C / 61°F	21°C / 70°F	249 hours	40.00 mm / 1.57 In	5 days	1017 mb / 30 In
2023	31°C / 88°F	15°C / 60°F	23°C / 73°F	249 hours	55.55 mm / 2.19 In	3 days	1016 mb / 30 In
2024	28°C / 82°F	16°C / 61°F	22°C / 71°F	204 hours	118.18 mm / 4.65 In	4 days	1016 mb / 30 In

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