Weather in September in Helena, Mt

< September >
	Normal Max/ High Temperature	21°C (70°F)
	Average Temperature	13°C (55°F)
	Min/ Low Temperature	5°C (41°F)
	Normal Precipitation	29mm (1.1in)
	Average Daylight per day	12h 29'
	Sun altitude at solar noon on the 21st day.	43.9°

• The average temperature in Helena, Mt in September is mild at 13 °C (55.4 °F).
• Afternoons can be warm with average high temperatures reaching 21 °C (69.8 °F).
• Overnight temperatures are generally cool with an average low of 5 °C (41 °F).
• The mean daily temperature range/ variation in September is 16 °C (28.8 °F).
• Precipitation averages for September are low with 29.2mm (1.1 in) recorded.
• The shortest day is 11h 40' long and the longest day is 13h 18' long with an average length of 12h 29'.

Weather Trend Graph for September in Helena, Mt, Usa