Weather in Billings in September 2025
Average weather
Average temperature in Billings in September
The temperature in September is +26°C on average, with a range between a maximum of +34°C during the day and a minimum of +7°C at night.
The average maximum temperature goes down 41% by the end of the month, compared with the beginning of the month, from +32°C to +21°C.
Is Billings warm or cold in September?
Billings is typically warm in September.
Maximum temperatures go down compared to the previous month from +31°C to +25°C. The minimum temperature also goes down from +15°C to +10°C.
It’s generally warm, but pack a long-sleeve shirt for evenings.
Take a look at how September is compared to other months in Billings:
Climate in Billings in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +31°C | +25°C | +17°C | ||||
| Min. temperature | ||||||
| +3°C | -12°C | -26°C | ||||
| Max. temperature | ||||||
| +40°C | +40°C | +34°C | ||||
| Rainfall | ||||||
| 24 mm | 39 mm | 36 mm | ||||
| Wind | ||||||
| 2 m/s | 3 m/s | 3 m/s | ||||
| Humidity | ||||||
| 43% | 49% | 56% | ||||
| Air pressure | ||||||
| 1011 HPa | 1012 HPa | 1014 HPa | ||||
| Sunny days | ||||||
| 11 | 11 | 8 | ||||
| Cloudy days | ||||||
| 8 | 9 | 11 | ||||
| Rainy days | ||||||
| 10 | 9 | 9 | ||||
| Snowy days | ||||||
| 0 | 0 | 3 | ||||
September weather is still as good as in August. It’s getting colder in September. From +31°C in the day, the average maximum temperature lowers to +25°C. Prepare for more rain. Average rainfall goes from 24 mm to 39 mm. Humidity rises from 43% to 49%. Winds are stronger in comparison to August, going up from 2 m/s to 3 m/s on average. The amount of sunny days stay about the same, averaging 11 sunny days during the month.
October brings much the same weather, it remains good.
Wind
The average wind speed is 3 m/s getting up to 6 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Billings is gradually increasing during September, going from 2 m/s to 3 m/s over the course of the month.
Rain
How was the weather last September in Billings?
Climate Change over Years
The climate in Billings in September has not changed much over the last 43 years.
The average temperature was the lowest in 1996 (+13°C) and the highest in 2012 (+19°C). The driest year was 1984 with only 203 mm of rainfall, and the wettest year was 2019 with 536 mm.
FAQ
Is September a good time to visit Billings?
Can you sunbathe in Billings in September?
Is Billings rainy in September?
Is it sunny in Billings in September?
Other cities in USA
Monthly weather in Billings
Source of the data
For this page, we’ve looked at the typical weather in Billings, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.
