easeweather.com
Rocky Mountain National Park (CO)
Akron (OH)Albuquerque (NM)Alexandria (VA)Anaheim (CA)Anchorage (AK)Arlington (VA)Asheville (NC)Atlanta (GA)Atlantic City (NJ)Austin (TX)Baltimore (MD)Baton Rouge (LA)Birmingham (AL)Boston (MA)Bowling Green (KY)Brooklyn (NY)Buffalo (NY)Cape Coral (FL)Charlotte (NC)Chattanooga (TN)Chicago (IL)Cincinnati (OH)Cleveland (OH)Colorado Springs (CO)Columbus (OH)Corpus Christi (TX)Dallas (TX)Dayton (OH)Daytona Beach (FL)Denver (CO)Des Moines (IA)Detroit (MI)El Paso (TX)Fairbanks (AK)Fort Lauderdale (FL)Fort Wayne (IN)Fort Worth (TX)Gatlinburg (TN)Grand Rapids (MI)Harrisburg (PA)Honolulu (HI)Houston (TX)Huntsville (AL)Indianapolis (IN)Jackson (MS)Jacksonville (FL)Juneau (AK)Kansas City (MO)Ketchikan (AK)Key West (FL)Knoxville (TN)Las Vegas (NV)Lexington (KY)Lincoln (NE)Little Rock (AR)Los Angeles (CA)Louisville (KY)Madison (WI)Manhattan (NY)Memphis (TN)Miami (FL)Milwaukee (WI)Minneapolis (MN)Mobile (AL)Montgomery (AL)Nashville (TN)New Orleans (LA)New York City (NY)Newark (NJ)Oklahoma City (OK)Omaha (NE)Orlando (FL)Philadelphia (PA)Phoenix (AZ)Pittsburgh (PA)Portland (OR)Richmond (VA)
Rocky Mountain National Park (CO)
Sacramento (CA)Salt Lake City (UT)San Antonio (TX)San Diego (CA)San Francisco (CA)San Jose (CA)Savannah (GA)Seattle (WA)Sitka (AK)Skagway (AK)Springfield (MO)St. Louis (MO)St. Petersburg (FL)Tallahassee (FL)Tampa (FL)Toledo (OH)Traverse City (MI)Tulsa (OK)Tyler (TX)Vancouver (WA)Virginia Beach (VA)WashingtonWinston-Salem (NC) More Locations
United States weather

Weather in Rocky Mountain National Park, Colorado for September 2026

Your guide to Rocky Mountain National Park weather in September - trends and predictions

    Temperatures

  • So far, September 2026 in Rocky Mountain National Park is slightly warmer than the historical average by 1.3 °F.

  • The forecast for the upcoming days in Rocky Mountain National Park predicts a temperature of 16.9 °F, which is slightly above the historical average.

  • In general, the average temperature in Rocky Mountain National Park at the beginning of September is 20.4 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 15.3 °F by the end of September.

    • Rain 🌧️

  • The climate of Rocky Mountain National Park in September is notably wet, with an average of 12 rainy days, and a total of 94.7 mm of precipitation.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
18
Dry days
Average rainy days
12
Rainy days
Average snowy days
0
Snow days
Average temperatures
17°/9°
Temperatures
Average wind speed
14 km/h
Avg max wind
Average humidity
53 %
Avg humidity

Rocky Mountain National Park Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Sunny
20°
2
Thundery outbreaks possible
20°
3
Cloudy
21°
4
Cloudy
24°
5
Cloudy
18°
6
Thundery outbreaks possible
19°
7
Thundery outbreaks possible
21°
8
Thundery outbreaks possible
20°
9
Thundery outbreaks possible
21°
10
Thundery outbreaks possible
23°
11
Thundery outbreaks possible
21°
12
Thundery outbreaks possible
20°
13
Light rain shower
21°
14
Moderate rain
18°
15
Partly cloudy
18°
16
Light rain shower
19°
17
Light rain shower
15°
18
Thundery outbreaks possible
14°
19
Cloudy
17°
20
Light rain shower
16°
21
Thundery outbreaks possible
16°
22
Patchy light rain with thunder
18°
23
Light sleet showers
13°
24
Overcast
13°
25
Sunny
16°
26
Sunny
19°
27
Overcast
19°
28
Overcast
15°
29
Patchy rain possible
11°
30
Patchy rain possible
14°

Temperatures trend during September in Rocky Mountain National Park

See the weather trend as well as the moving average line

September weather in Rocky Mountain National Park day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Sunny
Sunny
 20° /9° 0 mm 6
Sept. 2 Thundery outbreaks possible
Thundery outbreaks possible
 20° /10° 0.1 mm 7
Sept. 3 Cloudy
Cloudy
 21° /10° 0 mm 7
Sept. 4 Cloudy
Cloudy
 24° /10° 0.1 mm 8
Sept. 5 Cloudy
Cloudy
 18° /9° 0.1 mm 7
Sept. 6 Thundery outbreaks possible
Thundery outbreaks possible
 19° /10° 0.8 mm 4
Sept. 7 Thundery outbreaks possible
Thundery outbreaks possible
 21° /11° 0 mm 3
Sept. 8 Thundery outbreaks possible
Thundery outbreaks possible
 20° /10° 0.5 mm 5
Sept. 9 Thundery outbreaks possible
Thundery outbreaks possible
 21° /9° 0 mm 8
Sept. 10 Thundery outbreaks possible
Thundery outbreaks possible
 23° /8° 0 mm 7
Sept. 11 Thundery outbreaks possible
Thundery outbreaks possible
 21° /11° 0.9 mm 5
Sept. 12 Thundery outbreaks possible
Thundery outbreaks possible
 20° /8° 3.2 mm 5
Sept. 13 Light rain shower
Light rain shower
 21° /9° 2.3 mm 5
Sept. 14 Moderate rain
Moderate rain
 18° /7° 7 mm 4
Sept. 15 Partly cloudy
Partly cloudy
 18° /7° 0.4 mm 6
Sept. 16 Light rain shower
Light rain shower
 19° /8° 2.5 mm 3
Sept. 17 Light rain shower
Light rain shower
 15° /8° 10.9 mm 2
Sept. 18 Thundery outbreaks possible
Thundery outbreaks possible
 14° /6° 1.4 mm 2
Sept. 19 Cloudy
Cloudy
 17° /6° 0.8 mm 4
Sept. 20 Light rain shower
Light rain shower
 16° /7° 5.1 mm 5
Sept. 21 Thundery outbreaks possible
Thundery outbreaks possible
 16° /5° 1.1 mm 6
Sept. 22 Patchy light rain with thunder
Patchy light rain with thunder
 18° /5° 3.4 mm 5
Sept. 23 Light sleet showers
Light sleet showers
 13° /6° 8.7 mm 2
Sept. 24 Overcast
Overcast
 13° /4° 2.5 mm 2
Sept. 25 Sunny
Sunny
 16° /5° 2.2 mm 4
Sept. 26 Sunny
Sunny
 19° /5° 0 mm 6.8
Sept. 27 Overcast
Overcast
 19° /8° 5.1 mm 6.6
Sept. 28 Overcast
Overcast
 15° /7° 6.5 mm 4.6
Sept. 29 Patchy rain possible
Patchy rain possible
 11° /6° 1.7 mm 3.1
Sept. 30 Patchy rain possible
Patchy rain possible
 14° /5° 0.3 mm 6.5
Next
Important Notice
Our weather forecast for Rocky Mountain National Park in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Rocky Mountain National Park forecast closer to your planned date for the most up-to-date weather information.
Change Month
‹
›

Rocky Mountain National Park in September - FAQ

What are the expected maximum and minimum temperatures in Rocky Mountain National Park during September?
Enjoy moderate daytime temperatures of up to 17° and cooler nights around 9°. Ideal for a range of outdoor activities, from hiking to city tours.

How much rainfall should be expected in Rocky Mountain National Park during September?
Moderate rainfall is anticipated in Rocky Mountain National Park during September, with a total of 94.7 mm spread over approximately 12 days. Considering plans for rainy days is advisable.

What are the typical wind conditions in Rocky Mountain National Park during September?
The average wind speed in Rocky Mountain National Park during September is 14 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Rocky Mountain National Park

Explore the daily rainfall trends and prepare for Rocky Mountain National Parks September weather 💧
Typically, Rocky Mountain National Park has 12 rainy days in September with a total of 94.7 mm of rainfall.

UV exposure in Rocky Mountain National Park during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

Quick links

More Rocky Mountain National Park weather pages
You are here
Location coordinates Where is Rocky Mountain National Park?

Get accurate weather forecasts for Rocky Mountain National Park, located at latitude 40.343 and longitude -105.684. Stay updated with localized weather information tailored for Rocky Mountain National Park.

Found a mistake?
We appreciate your attention to details. Tell us here.