Things to Do in Billings in September
September weather, activities, events & insider tips
Low Season · Budget Friendly
September Weather in Billings
Long-run averages for September
74°F (23°C)
High Temp
48°F (9°C)
Low Temp
1.4 inches (36 mm)
Rainfall
43%
Humidity
5
Rainy Days
6
Sunny-Day UV
⚠ Wildfire smoke from fires burning across western Montana, Idaho, and the Pacific Northwest can settle into the Yellowstone Valley for days in September, reducing visibility and pushing air quality into unhealthy ranges. Monitor AQI forecasts and have indoor backup plans ready. In bad smoke years, the Rimrocks and mountain views disappear entirely.
⚠ Overnight temperatures can drop close to freezing in late September, outside the city in higher-elevation areas like the Beartooth Plateau. Frost on windshields is possible by month's end, and the Beartooth Highway summit regularly sees sub-zero Celsius (low 20s Fahrenheit) temperatures even when the valley floor is comfortable.
⚠ The dramatic daily temperature swing of 26°C (47°F) between morning lows and afternoon highs creates a genuine risk of hypothermia for underprepared hikers who start a trail in midday warmth and are still out when the sun drops behind the Rimrocks. Carry layers even on short hikes.
What's On in Billings in September
September in Billings brings cooler temperatures, with an average high of 23°C and an average low of 9°C, along with average rainfall of 36 mm. Visitors can enjoy Labor Day on Monday 6 September 2027. The month offers a transition from summer heat, as September is 6°C cooler than August and 9°C warmer than October.
September Climate Compared
| Month | Avg high | Avg low | Rainfall |
|---|---|---|---|
| August | 29°C | 14°C | 23 mm |
| September | 23°C | 9°C | 36 mm |
| October | 14°C | 2°C | 36 mm |
September is 6°C cooler than August; wetter than August (36 mm vs 23 mm); 9°C warmer than October.
Long-run monthly averages. Source: Wikipedia.
Daylight in September
Day length: 13 h 14 min on 1 September, 12 h 28 min on 15 September (−99 min compared with mid-August).
Computed from the city's coordinates (sunrise to sunset, standard solar geometry).
Public Holidays and Long Weekends
- Labor Day: Monday 6 September 2027 (3-day weekend (Sat–Mon))
Holiday dates: Nager.Date. Long-weekend notes are computed from the weekday.
Notable Places to Visit
Moss Mansion
Historic building in Montana, US
Hours (OSM): Feb 01-May 31 12:00-15:00; Feb 01-May 31,Jun 01-Aug 31 Tu off; Jun 01-Aug 31 Mo-Sa 10:00-16:00; Jun 01-Aug 31 Su 12:00-15:00; PH off
OSM · Wikidata · Website
Yellowstone Art Museum
Art museum in Billings, Montana
Hours (OSM): Tu-Su 10:00-17:00; Th 10:00-20:00
OSM · Wikidata · Website
Places within 8 km, ordered by Wikipedia coverage. Opening hours as mapped in OpenStreetMap (fetched 2026-10-16); check before you go. Data © OpenStreetMap contributors (ODbL); descriptions from Wikidata (CC0).
Quick Answers
How much rain does Billings get in September?
On average 36 mm in September.
How warm is Billings in September?
Average highs are 23°C and average lows 9°C.
How long are the days in Billings in September?
About 12 h 28 min of daylight on 15 September.
Are there public holidays in Billings in September?
Yes: Labor Day on Monday 6 September 2027. 1 of them create a long weekend.
What are some notable places to visit in Billings?
Moss Mansion, Western Heritage Center, Yellowstone Art Museum, Billings First Congregational Church (from OpenStreetMap and Wikidata).
Where to Stay in Billings in September
Hand-picked hotels across price tiers for September travellers.
Public Holidays in September
Dates that affect opening hours, transport and crowds
Labor Day
Known in English as Labour Day. Observed nationwide as a public holiday.
Labor Day
Known in English as Labour Day. Observed nationwide as a public holiday.
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