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

In Havre, the beginning of September is marked by a lowered average high-temperature, shifting from August's warm 83.8°F (28.8°C) to a pleasant 72°F (22.2°C). Nighttime temperatures throughout September register a significant deviation from the day's highs, averaging at a wintry 40.6°F (4.8°C).

Rainfall

In Havre, during September, the rain falls for 7 days and regularly aggregates up to 1.02" (26mm) of precipitation. In Havre, during the entire year, the rain falls for 89.9 days and collects up to 11.46" (291mm) of precipitation.

Snowfall

January through May, September through December are months with snowfall. 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, during the entire year, snow falls for 38.5 days and aggregates up to 45.2" (1148mm) of snow.

Daylight

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

Sunshine

In September, the average sunshine is 9h.

UV index

In Havre, Montana, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for average individuals.
Note: An average maximum UV index of 5 in September leads to these recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. Direct Sun exposure should be minimized especially during midday when radiation is most intense. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense. Notice! The UV radiation of the Sun can be intensified nearly twofold due to the reflective quality of snow.