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Climate · Bonner

Bonner in September

Warm and mostly dry, as the days shorten.

Typical weather, averaged over 30 years

September in Bonner is warm: highs near 76°F, lows near 46°F. Rain falls on about two days a week, and the days shorten by 1 hour 12 minutes from the first week to the last.September in Bonner is warm: highs near 24°C, lows near 8°C. Rain falls on about two days a week, and the days shorten by 1 hour 12 minutes from the first week to the last.

High
76°F24°Caverage
Low
46°F8°Caverage
Wet days
2a week · 22% of days
Daylight
12h 27mon average

Is September a good time to visit Bonner?

Yes. September is one of Bonner's best months (July, or September).

How we judge it: every month is scored on how close its typical high comes to the range from 70°F to 80°F, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.How we judge it: every month is scored on how close its typical high comes to the range from 21°C to 27°C, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.

How September sits in the year

week by week

Temperature

Highs near 76°F in September, against 34°F to 86°F through the year.Highs near 24°C in September, against 1°C to 30°C through the year.

Chance of a wet day

22% of days in September, against 16% to 47% through the year.

Cloud cover

43% cover in September, against 27% to 71% through the year.

Daylight

12h 27m in September, against 8h 35m to 15h 49m through the year.

Week by week, lightly smoothed, with September shaded. The olive line marks the best months. Hover or tap a week for its figures.

Either side

  1. August86°30°low 54°low 12°1 wet day a weekRain on about one day a week.
  2. September76°24°low 46°low 8°2 wet days a weekRain on about two days a week.
  3. October62°17°low 36°low 2°2 wet days a weekRain on about two days a week.

Where Bonner sits, in September

America/Denver
this place
typical high in September 40°F4°C95°F35°C
Sunrise, mid-September
7:10 AMsets 7:48 PM
Above the sea
1,140 mupland
Latitude
46.9°Nnorthern hemisphere
Nearest of ours
Philipsburg74 km south

The land around Bonner, shaded by its typical high in September, the planning map's own layer. Hover the map for the figure at that spot; tap it on a phone. Clock times are local, for the 15th.

Elsewhere in United States in September

high · low · wet days
See September on the planning mapThe whole year in Bonner

Typical weather, averaged over 30 years (1995–2024), from the 11 km grid square nearest Bonner. Temperatures are adjusted against 66 weather stations: daytime highs read about 3.1°F cold in the source data and are raised to match, and both highs and lows are adjusted for the town's height (1,140 m) against the climate model's (1,507 m).Temperatures are adjusted against 66 weather stations: daytime highs read about 1.7°C cold in the source data and are raised to match, and both highs and lows are adjusted for the town's height (1,140 m) against the climate model's (1,507 m). Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not. Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.

Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not.

Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.