Great Falls Weather in September

September in Great Falls averages 23°C (73°F) during the day and 7°C (45°F) at night. The excellent conditions and moderate rainfall make it a solid month to visit.

Rainfall in Great Falls in September

Typically, about 7 days will experience rainfall, with an average of 35 mm (1.4 in) for the month. Neither particularly heavy nor particularly frequent, the rain this month is about average. A light jacket should be enough on most wet days.

Temperature in Great Falls in September

The temperature in Great Falls in September is excellent. Daytime highs reach 23°C (73°F), with nights dropping to 7°C (45°F). Overall, the month follows a fairly predictable daily temperature pattern. At 7°C (45°F) overnight, it gets properly cold after dark. On the bright side, cold nights tend to make for excellent sleeping conditions.

Sunshine in Great Falls in September

With approximately 255 hours of sunshine, the days are filled with clear skies. It makes it a perfect month for being outside.

Wind Speed in Great Falls in September

In September, average wind speeds reach 4 m/s (8 knots), leading to light to moderate breezes. Conditions vary from day to day, with both calm and windier periods.

If you're a fan of comfortable temperatures and drier conditions, September is a great time to visit.