September weather forecast
Whitefish, MT

The climate of September signals a transition towards cooler months in Whitefish, offering a mild respite from the summer heat. Despite the slight dip in temperature, the weather remains largely hospitable, even as the days begin to shorten. Average temperatures take a mild dip, ranging from 37°F (2.8°C) to 68°F (20°C), bringing a gentle chill to the air. A near-constant quantity of rainfall from August to September, about 1.5" (38mm) approximately, helps nurture the vibrant fall foliage. The shrinking daylight hours, now at 12.6, begin painting a poignant picture of the changing season.

Temperature

As Whitefish enters September, the average high-temperature decreases from the a moderately hot 78.8°F (26°C) of August to a pleasant 68°F (20°C). In September, the temperature in Whitefish sees a substantial plunge from daytime highs to a low average of 37.4°F (3°C).

Rainfall

In September, in Whitefish, the rain falls for 8 days. Throughout September, 1.46" (37mm) of precipitation is accumulated. In Whitefish, during the entire year, the rain falls for 131 days and collects up to 19.8" (503mm) of precipitation.

Daylight

The average length of the day in September is 12h and 34min.
On the first day of September in Whitefish, Montana, sunrise is at 6:56 am and sunset at 8:18 pm. On the last day of the month, sunrise is at 7:36 am and sunset at 7:17 pm MDT.

Sunshine

In September, the average sunshine in Whitefish is 8h.

UV index

In Whitefish, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for ordinary individuals.
Note: The daily maximum UV index of 5 in September interprets into the following advice:
Take heed. Individuals of lighter complexion can be burned in less than half an hour. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears.