Alamosa (CO)
September
Weather in Alamosa, Colorado for September 2026
Your guide to Alamosa weather in September - trends and predictions
So far, September 2026 in Alamosa is slightly warmer than the historical average by 1.3 °F.
The forecast for the upcoming days in Alamosa predicts a temperature of 19.6 °F, which is slightly above the historical average.
In general, the average temperature in Alamosa at the beginning of September is 25.4 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 18.4 °F by the end of September.
The climate of Alamosa in September is notably wet, with an average of 11 rainy days, and a total of 73 mm of precipitation.
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Temperatures
Rain 🌧️
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19
Dry days
11
Rainy days
0
Snow days
22°/7°
Temperatures
21 km/h
Avg max wind
54 %
Avg humidity
Alamosa Weather September
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Temperatures trend during September in Alamosa
See the weather trend as well as the moving average line
September weather in Alamosa day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Partly cloudy | 25° /10° | 0.1 mm | 7 | |
| Sept. 2 |  Sunny | 26° /9° | 0 mm | 8 | |
| Sept. 3 | Sunny | 27° /9° | 0 mm | 8 | |
| Sept. 4 |  Cloudy | 27° /10° | 0.3 mm | 6 | |
| Sept. 5 |  Moderate or heavy rain shower | 23° /9° | 26.5 mm | 7 | |
| Sept. 6 | Sunny | 25° /8° | 1.2 mm | 5 | |
| Sept. 7 |  Overcast | 25° /10° | 0.2 mm | 5 | |
| Sept. 8 | Sunny | 26° /9° | 0 mm | 8 | |
| Sept. 9 | Sunny | 27° /9° | 0 mm | 8 | |
| Sept. 10 | Moderate or heavy rain shower | 26° /9° | 0.9 mm | 7 | |
| Sept. 11 | Moderate rain at times | 25° /8° | 1.4 mm | 7 | |
| Sept. 12 | Sunny | 24° /9° | 4 mm | 6 | |
| Sept. 13 | Sunny | 24° /9° | 2.8 mm | 7 | |
| Sept. 14 | Sunny | 24° /7° | 0.1 mm | 5 | |
| Sept. 15 | Moderate rain at times | 23° /7° | 0.5 mm | 4 | |
| Sept. 16 | Moderate or heavy rain shower | 21° /8° | 1.7 mm | 4 | |
| Sept. 17 | Moderate or heavy rain shower | 22° /9° | 3.1 mm | 4 | |
| Sept. 18 | Partly cloudy | 22° /6° | 0.2 mm | 5 | |
| Sept. 19 | Sunny | 23° /5° | 0.9 mm | 6 | |
| Sept. 20 |  Patchy rain possible | 23° /6° | 0.1 mm | 6 | |
| Sept. 21 | Moderate or heavy rain shower | 21° /6° | 7.6 mm | 6 | |
| Sept. 22 | Patchy rain possible | 20° /6° | 1.2 mm | 4 | |
| Sept. 23 | Overcast | 18° /6° | 5.5 mm | 3 | |
| Sept. 24 | Partly cloudy | 18° /7° | 3.9 mm | 4 | |
| Sept. 25 | Sunny | 23° /5° | 1.4 mm | 5 | |
| Sept. 26 | Sunny | 21° /9° | 0 mm | 7.4 | |
| Sept. 27 | Overcast | 22° /11° | 0 mm | 7.2 | |
| Sept. 28 | Overcast | 14° /10° | 5.8 mm | 2.7 | |
| Sept. 29 | Light rain shower | 16° /10° | 6 mm | 6.2 | |
| Sept. 30 | Patchy rain possible | 15° /10° | 3 mm | 5.3 | |
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Important Notice
Our weather forecast for Alamosa 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 Alamosa forecast closer to your planned date for the most up-to-date weather information.
Change Month
Alamosa in September - FAQ
What are the expected maximum and minimum temperatures in Alamosa during September?
Enjoy moderate daytime temperatures of up to 22° and cooler nights around 7°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Alamosa during September?
Moderate rainfall is anticipated in Alamosa during September, with a total of 73 mm spread over approximately 11 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Alamosa during September?
The average wind speed in Alamosa during September is 21 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Alamosa
Explore the daily rainfall trends and prepare for Alamosas September weather 💧
Typically, Alamosa has 11 rainy days in September with a total of 73 mm of rainfall.
UV exposure in Alamosa during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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