Whitefish, MT weather in September
September in Whitefish: mild, with some rain. Highs 70°F, lows 38°F, about 8 wet days. A great month for outdoor plans.
- Normal high
- 70°F
- Normal low
- 38°F
- Wet days
- 8
- 1.2 in total
- Muggy days
- 0
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 76°F | 64°F |
| Normal low | 42°F | 34°F |
| Chance of a wet day | 24% | 26% |
| Sunrise / sunset | 6:55 am / 8:19 pm | 7:35 am / 7:19 pm |
| Daylight | 13.4 h | 11.7 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Mountain Time).
A typical September day
- 6 am42°Fdew point 38°F
- 9 am54°Fdew point 42°F
- Noon64°Fdew point 41°F
- 3 pm68°Fdew point 40°F
- 6 pm65°Fdew point 40°F
- 9 pm52°Fdew point 41°F
NOAA hourly normals (local standard time) from Kalispell Glacier Airport (8 mi away); average wind 5 mph.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F16 of 30
- Hot dayshigh 90°F or more1 of 30
- Muggy daysdaily mean dew point 65°F or more0 of 30
- Wet daysat least 0.01 in of rain or melted snow8 of 30
- Notable rainat least 0.10 in4 of 30
- Freezing nightslow 32°F or below5 of 30
- Snow on the groundsnow depth 1 in or more0 of 30
Average days per September, counted from daily records for each year 1991-2020.
Rain in September
Normal precipitation is 1.2 in; a dry September brings about 0.6 in and a wet one about 1.6 in (25th and 75th percentiles). Days with half an inch or more are rare. Snow is very rare.
How September varies from year to year
- Warmest September, 1991-20201998: average high 77°F
- Coolest September2004: average high 64°F
- Wettest September2005: 2.7 in
- Driest September2009: 0.1 in
- Highest reading96°F (September 2, 1998)
- Lowest reading19°F (September 23, 2000)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
September compared with August and October
| August | September | October | |
|---|---|---|---|
| Normal high | 82°F | 70°F | 54°F |
| Normal low | 46°F | 38°F | 29°F |
| Wet days | 6 | 8 | 11 |
| Comfortable days | 11 | 16 | 5 |
| Daylight | 14.3 h | 12.6 h | 10.8 h |
Highs change by -12°F from August and -16°F into October.
How Whitefish ranks in September
- Normal high346th warmest of 378 cities; 4th of 6 in Montana
- Wet days181st driest of 378
- Comfortable days45th most of 342
What to pack for Whitefish in September
- A warm jacket – lows near 38°F, highs near 70°F
- Layers – afternoons near 70°F but nights near 38°F
Frost in September
The first fall frost typically comes around Sep 25; in 1 year in 10 it comes before Sep 8. All frost dates for Whitefish.
Heating and cooling
September has 324 heating degree days and 4 cooling degree days (base 65°F), 4% of the year's total heating and cooling demand.
Questions
How hot is Whitefish in September?
The normal high is 70°F and the normal low is 38°F. From 1991 to 2020 the hottest September reading was 96°F (September 2, 1998).
Does it rain a lot in Whitefish in September?
About 8 days in September have at least 0.01 in of precipitation, and the normal total is 1.2 in. The wettest September in 1991-2020 was in 2005 (2.7 in); the driest was in 2009 (0.1 in).
Does it snow in Whitefish in September?
Snow is very rare: the 1991-2020 normal for September rounds to 0.0 in.
Is September a good time to visit Whitefish?
September ranks 3rd of 12 months on our comfort score for Whitefish (72 out of 100). It has about 16 comfortable days and about 1 day at 90°F or hotter. The best months are May and June.
Where the numbers come from
- Temperature, rain, snow depth and humidity and wind by hour: Kalispell Glacier Airport (USC00244558), 8.1 mi SSE of the city center, 2,957 ft (78 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Snowfall and frost dates: Whitefish (USC00248902), 1.0 mi WSW of the city center, 3,100 ft (65 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Glacier Park International Airport (727790-24146), 8.1 mi SSE of the city center, 2,963 ft (72 ft lower than the city). Hourly observations, 1991-2020.
- Not available for this location: cloud cover (no station close enough or similar enough in elevation).