Helena September Weather Averages Montana, United States of America

September Weather Averages for Helena

High Temp	21°C	70°F
Low Temp	7°C	45°F
Avg Temp	14°C	58°F
Sunshine Hours	277 hours
Rainfall	45.18 mm	1.78 In
Rain days	4 days
Pressure	1015 mb	30 In

Helena September Averages Year by Year

Year	High Temp	Low Temp	Avg Temp	Sunshine Hours	Rainfall	Rain days	Pressure
2009	24°C / 76°F	9°C / 48°F	17°C / 62°F	327 hours	24.60 mm / 0.97 In	2 days	1016 mb / 30 In
2010	19°C / 66°F	6°C / 42°F	12°C / 54°F	263 hours	27.60 mm / 1.09 In	3 days	1014 mb / 30 In
2011	23°C / 74°F	8°C / 46°F	16°C / 60°F	332 hours	5.10 mm / 0.20 In	1 days	1017 mb / 31 In
2012	23°C / 73°F	8°C / 46°F	15°C / 60°F	320 hours	3.03 mm / 0.12 In	1 days	1017 mb / 31 In
2013	20°C / 68°F	8°C / 47°F	14°C / 58°F	249 hours	73.77 mm / 2.90 In	9 days	1012 mb / 30 In
2014	20°C / 68°F	6°C / 43°F	13°C / 56°F	279 hours	36.80 mm / 1.45 In	3 days	1015 mb / 30 In
2015	21°C / 71°F	8°C / 47°F	15°C / 58°F	248 hours	49.15 mm / 1.94 In	5 days	1013 mb / 30 In
2016	18°C / 65°F	6°C / 43°F	12°C / 54°F	270 hours	50.82 mm / 2.00 In	5 days	1016 mb / 30 In
2017	19°C / 67°F	7°C / 45°F	13°C / 56°F	265 hours	62.38 mm / 2.46 In	6 days	1016 mb / 30 In
2018	19°C / 66°F	7°C / 44°F	13°C / 55°F	274 hours	17.78 mm / 0.70 In	5 days	1015 mb / 30 In
2019	18°C / 65°F	8°C / 46°F	13°C / 55°F	222 hours	82.10 mm / 3.23 In	7 days	1013 mb / 30 In
2020	23°C / 73°F	7°C / 45°F	15°C / 59°F	308 hours	19.00 mm / 0.75 In	3 days	1017 mb / 31 In
2021	24°C / 75°F	8°C / 46°F	16°C / 60°F	309 hours	2.63 mm / 0.10 In	0 days	1013 mb / 30 In
2022	24°C / 75°F	9°C / 48°F	16°C / 62°F	238 hours	46.57 mm / 1.83 In	3 days	1014 mb / 30 In
2023	22°C / 71°F	7°C / 44°F	14°C / 57°F	253 hours	66.25 mm / 2.61 In	6 days	1013 mb / 30 In
2024	23°C / 74°F	8°C / 47°F	15°C / 60°F	271 hours	155.22 mm / 6.11 In	4 days	1012 mb / 30 In

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