These Were Montana’s Warmest Septembers on Record

September in Montana is a special time; there’s a lot to look forward to. 

Cooler Nights and Warm Days: The September Shift

We start to see some cooler nights becoming more consistent, while the days can still be plenty warm, especially during the first part of the month. Hunting season gets underway across different parts of Montana, the leaves start to change, and we begin that big transition toward fall. 

We also continue to lose daylight as we move toward the autumnal equinox. 

The Signs of Change: Early Frosts and Shortening Days

By the end of September, you can really start to feel the difference. The days are shorter, the nights are cooler, and those first frosts start getting closer for communities across Montana. For most of the state, though, the first frost usually doesn't arrive until later in the month. 

READ MORE:  Montana’s First Frost Could Be Coming Sooner Than You Think

September really is that bridge between summer and fall. 

You can still have some beautiful, warm Montana days, but you know what's coming. 

October. 

Reflecting on Montana’s Warmest Septembers

So, as we get ready to make that transition, I thought it would be fun to take a look back at some of Montana's warmest Septembers. 

Historical Weather Insights: Montana's Climate Records

NOAA has been keeping statewide climate records going back to 1895, giving us more than 130 years of Montana weather history to look through. 

READ MORE: Old Farmer’s Almanac Predicts Two Very Different Falls for Montana 

When it comes to extreme temperatures, according to Extremeweatherwatch.com, Montana’s warmest September on record was in 1998, with an average high temperature of 76.3 °F. 

That only looks at the high temperatures across the state. We’ll be looking at the warmest average temperatures across the state, which takes both daytime highs and nighttime lows into account.

Top 10 Warmest Septembers in Montana History

So, which years had the warmest average September temperatures in Montana? 

Here are the 10 warmest Septembers Montana has seen on record.