Temperature in The Rocky Mountains in September

Daytime highs, nighttime lows and the warmest cities in the Rocky Mountains, the United States of America this September.

The Rocky Mountains, the United States of America, a region in the United States of America, experiences maximum daytime temperatures in September ranging from 16°C (61°F) in Leadville to 23°C (73°F) in Bozeman. Nighttime temperatures generally drop to 6°C (43°F) in Bozeman and 1°C (34°F) in Leadville.

What is the temperature of the different cities in the Rocky Mountains, the United States of America in September?

To get a sense of September's typical temperatures in the key spots of the Rocky Mountains, explore the map below. Click on a point for an in-depth look.

Select a Month

Check the conditions for any month of the year.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

For a detailed overview over the year and the best time to visit the Rocky Mountains, check out our the Rocky Mountains's climate page.

See also: the Rocky Mountains weather by month.

Best Places to Visit in the Rocky Mountains in September

Click on a destination dot for more details. Toggle the map to compare temperatures or precipitation across the Rocky Mountains.

Conditions Temperatures Precipitation
Avg daytime high -5°C (23°F) cold → 32°C (90°F) hot

Marker color shows the average daytime high temperature in September: blue is cold, red is hot.

See all September weather averages, cities and regions in the Rocky Mountains

The Rocky Mountains temperatures in September: frequently asked questions

How hot does it get in the Rocky Mountains, the United States of America in September?

Breckenridge averages a daytime high of 17°C (63°F) in September, which is moderate for the Rocky Mountains, the United States of America.

How cold does it get at night in the Rocky Mountains, the United States of America in September?

After dark, Breckenridge cools to about 2°C (36°F) on an average September night.

What is the warmest city in September in the Rocky Mountains, the United States of America?

Based on our systematic data collection, Bozeman has been identified as the city with the highest average temperatures. The daytime temperature usually hovers around 23°C (73°F), while at night it goes down to an approximate temperature of 6°C (43°F).

What is the coldest city in September in the Rocky Mountains, the United States of America?

In our database, Leadville is the chilliest city in September in the Rocky Mountains, the United States of America. Daytime temperatures typically peak at 16°C (61°F), while the nighttime lows hover around 1°C (34°F).

Interested in more climate information?

We have much more information about the climate in the Rocky Mountains.

Weather and climate has detailed information for every country in the world. Are you going to the United States of America? Get detailed historical weather averages for many cities in the United States of America.

Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.

Bucket list

Need travel inspiration? Check out our bucket list articles and be inspired.

Yosemite National Park is definitely worth a visit

Vast forests, blue lakes, towering sequoias, and majestic waterfalls hint at the beauty of Yosemite National Park—a true natural masterpiece.
The 10 most alternative cities in the United States

Discover the top 10 fun and alternative U.S. cities rich in art, culture, and adventure. From Portland's hippy charm to Sedona's stunning landscapes.
Sedona: Explore Majestic Red Rock Landscapes

A picturesque artists' town surrounded by red rocks and known for its spirituality, vortex energy, and stunning hikes like Cathedral Rock.
10 most idyllic villages to visit in the United States

Discover 10 idyllic villages in the USA, from California to Vermont. Explore their unique charm, rich history, stunning nature, and vibrant arts scenes.
Must visit in the United States of America →