Billings, MT weather in September
In September, Billings sees highs around 75°F and lows around 45°F: mild, with some rain. There are about 7 days with rain. Good for outdoor plans.
- Normal high
- 75°F
- Normal low
- 45°F
- Wet days
- 7
- 1.4 in total
- Muggy days
- 0
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 81°F | 69°F |
| Normal low | 49°F | 41°F |
| Chance of a wet day | 21% | 25% |
| Sunrise / sunset | 6:35 am / 7:52 pm | 7:11 am / 6:56 pm |
| Daylight | 13.3 h | 11.8 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 am51°Fdew point 38°F
- 9 am57°Fdew point 40°F
- Noon68°Fdew point 39°F
- 3 pm72°Fdew point 38°F
- 6 pm68°Fdew point 39°F
- 9 pm61°Fdew point 39°F
NOAA hourly normals (local standard time) from Billings Logan Intl Airport (3 mi away); average wind 9 mph; clear or few clouds in 53% of daytime hours, mostly cloudy or overcast in 26%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F13 of 30
- Hot dayshigh 90°F or more4 of 30
- Muggy daysdaily mean dew point 65°F or more0 of 30
- Wet daysat least 0.01 in of rain or melted snow7 of 30
- Notable rainat least 0.10 in3 of 30
- Freezing nightslow 32°F or below1 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 and snow in September
Normal precipitation is 1.4 in; a dry September brings about 0.6 in and a wet one about 1.8 in (25th and 75th percentiles). About 1 day brings half an inch or more. Normal snowfall is 0.3 in.
How September varies from year to year
- Warmest September, 1991-20202009: average high 85°F
- Coolest September2018: average high 71°F
- Wettest September2013: 3.6 in
- Driest September2012: no measurable precipitation
- Highest reading101°F (September 6, 2020)
- Lowest reading27°F (September 12, 2014)
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 | 85°F | 75°F | 60°F |
| Normal low | 54°F | 45°F | 34°F |
| Wet days | 6 | 7 | 8 |
| Comfortable days | 4 | 13 | 12 |
| Daylight | 14.1 h | 12.5 h | 10.9 h |
Highs change by -10°F from August and -15°F into October.
Nearby alternatives in September
- Cooler: Big Sky, MT143 mi · high 68°F · 10 wet days
How Billings ranks in September
- Normal high278th warmest of 378 cities; 1st of 6 in Montana
- Wet days141st driest of 378
- Comfortable days121st most of 342
What to pack for Billings in September
- Layers – afternoons near 75°F but nights near 45°F
Heating and cooling
September has 183 heating degree days and 36 cooling degree days (base 65°F), 3% of the year's total heating and cooling demand.
Questions
How hot is Billings in September?
The normal high is 75°F and the normal low is 45°F. From 1991 to 2020 the hottest September reading was 101°F (September 6, 2020).
Does it rain a lot in Billings in September?
About 7 days in September have at least 0.01 in of precipitation, and the normal total is 1.4 in. The wettest September in 1991-2020 was in 2013 (3.6 in); the driest was in 2012, with no measurable precipitation.
Does it snow in Billings in September?
Yes. Normal snowfall in September is 0.3 in.
Is September a good time to visit Billings?
September ranks 4th of 12 months on our comfort score for Billings (66 out of 100). It has about 13 comfortable days and about 4 days at 90°F or hotter. The best month is May.
Where the numbers come from
- Temperature and frost dates: Billings WTP (USC00240802), 1.2 mi SE of the city center, 3,097 ft . NOAA normals and daily records, 1991-2020.
- Rain, snowfall, snow depth, humidity and wind by hour and cloud cover: Billings Logan Intl Airport (USW00024033), 2.6 mi NW of the city center, 3,581 ft (459 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Billings Logan International Airport (726770-24033), 2.7 mi NW of the city center, 3,590 ft (468 ft higher than the city). Hourly observations, 1991-2020.