Littleton (CO)
September
Weather in Littleton, Colorado for September 2026
Your guide to Littleton weather in September - trends and predictions
So far, September 2026 in Littleton is slightly warmer than the historical average by 1.4 °F.
The forecast for the next days in Littleton predicts temperatures to be around 23 °F, close to the historical average.
In general, the average temperature in Littleton at the beginning of September is 28.9 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 23 °F by the end of September.
The climate of Littleton in September is notably wet, with an average of 11 rainy days, and a total of 79.3 mm of precipitation.
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Temperatures
Rain 🌧️
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19
Dry days
11
Rainy days
0
Snow days
26°/13°
Temperatures
19 km/h
Avg max wind
42 %
Avg humidity
Littleton Weather September
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Temperatures trend during September in Littleton
See the weather trend as well as the moving average line
September weather in Littleton day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 29° /16° | 0 mm | 7 | |
| Sept. 2 | Sunny | 31° /14° | 0 mm | 8 | |
| Sept. 3 |  Patchy rain possible | 30° /14° | 0.1 mm | 8 | |
| Sept. 4 | Sunny | 31° /14° | 1.7 mm | 8 | |
| Sept. 5 |  Patchy light rain with thunder | 24° /13° | 2.1 mm | 6 | |
| Sept. 6 | Sunny | 27° /13° | 0 mm | 8 | |
| Sept. 7 |  Partly cloudy | 30° /16° | 0 mm | 6 | |
| Sept. 8 | Sunny | 29° /15° | 1.2 mm | 7 | |
| Sept. 9 |  Overcast | 28° /14° | 0 mm | 7 | |
| Sept. 10 | Patchy rain possible | 30° /14° | 2.1 mm | 7 | |
| Sept. 11 |  Moderate rain at times | 29° /15° | 2.4 mm | 7 | |
| Sept. 12 | Overcast | 28° /14° | 0 mm | 7 | |
| Sept. 13 | Overcast | 28° /13° | 2.2 mm | 7 | |
| Sept. 14 | Partly cloudy | 29° /14° | 2.2 mm | 5 | |
| Sept. 15 | Patchy rain possible | 27° /12° | 0.1 mm | 6 | |
| Sept. 16 | Patchy rain possible | 27° /13° | 10.2 mm | 4 | |
| Sept. 17 |  Cloudy | 25° /13° | 4.8 mm | 4 | |
| Sept. 18 | Sunny | 24° /11° | 1.1 mm | 4 | |
| Sept. 19 | Sunny | 26° /11° | 0.7 mm | 6 | |
| Sept. 20 | Overcast | 25° /12° | 0.4 mm | 6 | |
| Sept. 21 | Overcast | 23° /10° | 6.1 mm | 6 | |
| Sept. 22 |  Moderate rain | 21° /9° | 18.8 mm | 5 | |
| Sept. 23 |  Mist | 20° /9° | 2.7 mm | 3 | |
| Sept. 24 | Partly cloudy | 21° /11° | 2.1 mm | 4 | |
| Sept. 25 | Sunny | 27° /10° | 1.5 mm | 6 | |
| Sept. 26 | Sunny | 26° /10° | 0 mm | 6.6 | |
| Sept. 27 | Overcast | 27° /13° | 0 mm | 6.4 | |
| Sept. 28 | Overcast | 23° /14° | 0 mm | 4.1 | |
| Sept. 29 | Overcast | 16° /12° | 0.7 mm | 1.1 | |
| Sept. 30 | Overcast | 21° /11° | 0.7 mm | 6.5 | |
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Important Notice
Our weather forecast for Littleton 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 Littleton forecast closer to your planned date for the most up-to-date weather information.
Change Month
Littleton in September - FAQ
What are the expected maximum and minimum temperatures in Littleton during September?
Enjoy moderate daytime temperatures of up to 26° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Littleton during September?
Moderate rainfall is anticipated in Littleton during September, with a total of 79.3 mm spread over approximately 11 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Littleton during September?
The average wind speed in Littleton during September is 19 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Littleton
Explore the daily rainfall trends and prepare for Littletons September weather 💧
Typically, Littleton has 11 rainy days in September with a total of 79.3 mm of rainfall.
UV exposure in Littleton during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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