September weather forecast
Havre, MT

As summer fades, September brings milder temperatures to Havre, Montana. Though still warm during the day, evenings start to hint towards the advancing fall. For the first time since May, a small amount of 0.3" (8mm) of snowfall is documented. Such conditions make for comfortable outdoor exploration, with vivid seasonal colors starting to transform the landscape. The balancing act between the residue of summer and the onset of autumn differentiates September's weather.

Temperature

With September's onset, the average high-temperature recedes from August's warm 83.8°F (28.8°C) to a pleasant 72°F (22.2°C). With a notable disparity from daily peak temperatures, the average low-temperature in Havre settles at an icy 40.6°F (4.8°C) throughout September.

Rainfall

In September, in Havre, the rain falls for 7 days. Throughout September, 1.02" (26mm) of precipitation is accumulated. Throughout the year, there are 89.9 rainfall days, and 11.46" (291mm) of precipitation is accumulated.

Snowfall

January through May, September through December are months with snowfall in Havre. September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 0.31" (8mm) of snow. In Havre, Montana, during the entire year, snow falls for 38.5 days and aggregates up to 45.2" (1148mm) of snow.

Daylight

In September, the average length of the day in Havre is 12h and 34min.
On the first day of September, sunrise is at 6:37 am and sunset at 7:59 pm. On the last day of the month, sunrise is at 7:17 am and sunset at 6:58 pm MDT.

Sunshine

In Havre, the average sunshine in September is 9h.

UV index

In Havre, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for average individuals.
Note: A maximum UV index of 5 in September translates into the following recommendations:
Proceed with care. Light skin individuals may be exposed to burns in fewer than 30 minutes. It's recommended to limit sun exposure when its radiation is at its peak during midday. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes. Consider this! The reflection from snow can almost double the intensity of the Sun's UV radiation.