Temperatures in September
It's warm in September in Rocky Mountain National Park with an average temperature of 28°C. Temperatures this month range from a low of 22°C to a high of 32°C. At night, you can expect temperatures between 9°C and 16°C.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for Rocky Mountain National Park in September. The red line indicates the max temperatures, and the blue line shows the minimums.
Start of September
The month of September starts in Rocky Mountain National Park with hot temperatures, averaging around 30°C during the day and nights close to 14°C. There’s little chance of precipitation. The weather is mostly sunny and dry.
Since temperatures can differ between day and night, it’s a good idea to dress in layers.
Mid-September
By mid-September, the average daytime temperature drops to around 29°C, with nights close to 12°C. Not much precipitation expected during this period. It’s mostly dry with sunshine.
End of September
By the end of September, the average daytime temperature in Rocky Mountain National Park will be around 26°C, with nights close to 10°C. Barely any chance of precipitation. The weather will mostly be dry with lots of sunshine.
Discover cheap holidays to Rocky Mountain National Park 
Precipitation in September
In September, there is an average of 11 mm of precipitation, spread over 3 days. Of the total precipitation, about 1,0 cm falls as snow in September. The wind speed is around 3 Bft, mostly coming from the South.
The precipitation chance averages 11% per day this month. Though that seems low, there are also a few days with a higher chance of precipitation.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in September for Rocky Mountain National Park. 0% means it never rained on that day in the past 10 years, and 100% means it rained every day. All values in between represent the average chance of precipitation on that day.
Rocky Mountain National Park in September |
UK | ||
|---|---|---|---|
 Average Temperature |
28°C | 20°C | |
 High Temp |
32°C | 22°C | |
| Low Temp |
22°C | 17°C | |
 Total Precipitation |
11 mm | 44 mm | |
| Rainy Days |
3 days | 8 days | |
 Total Snowfall |
1,0 cm | 0 cm | |
| Snowy Days |
1 day | 0 days | |
August
UV index
The UV index is a maximum of 9 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.
Is September a good time to visit Rocky Mountain National Park?
Want nice weather? Then September is a great time to be in Rocky Mountain National Park. You’ll have pleasant temperatures and little chance of rain this month.
Temperature records for Rocky Mountain National Park in September
With 39°C, Rocky Mountain National Park hit the highest temperature in the last 10 years in September 2019. The lowest daytime temperature in this month was 6°C in 2020. The extreme night temperatures ranged from a low of 0°C to a high of 21°C.
Plan your next holiday
Don’t miss the best holiday deals for Rocky Mountain National Park and see what our partners have for you.
Daily Temperature in September in Rocky Mountain National Park
This chart shows the average daily temperatures, both day and night, for each day in September in Rocky Mountain National Park, measured in degrees Celsius. The red line represents the maximum temperatures, while the blue line shows the minimums. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, gives an overview of the average daily temperatures during this month.
Daily Precipitation in September in Rocky Mountain National Park
The chart below shows the average daily precipitation in September for Rocky Mountain National Park, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are shown at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that rain is more likely. But it’s still an average, so each day can be different. Based on historical weather data for September, you can expect around 3 days of rain in Rocky Mountain National Park.
Daily Snowfall in September in Rocky Mountain National Park
This chart shows the average daily snowfall in September in Rocky Mountain National Park, measured in centimetres. The bottom of the chart shows the days of the month. The data is based on historical measurements and gives an idea of the average snowfall in September.
Daily UV Index in September in Rocky Mountain National Park
This chart shows the average daily UV index in September in Rocky Mountain National Park, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Temperature in September in Rocky Mountain National Park Over the Years
This chart shows the average temperature in September in Rocky Mountain National Park, measured in degrees Celsius, over the past years.
Total Precipitation in September in Rocky Mountain National Park Over the Years
This chart shows the average precipitation in September in Rocky Mountain National Park, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Snowfall in September in Rocky Mountain National Park per year
This chart shows the average snowfall in September in Rocky Mountain National Park, measured in centimetres, over the past years.
Daily climate in September for Rocky Mountain National Park
Click on a specific day in September for detailed info on the typical weather on that day in Rocky Mountain National Park. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in September in Rocky Mountain National Park
Have you been to Rocky Mountain National Park in September?
Share your weather experience in September in Rocky Mountain National Park.
Average Weather in Rocky Mountain National Park by Month
Click on a month below to see detailed weather info for Rocky Mountain National Park. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
Or check out the climate of Rocky Mountain National Park for all months at once
