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United States weather

Weather in Alamosa, Colorado for September 2025

Your guide to Alamosa weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Alamosa is slightly cooler than the historical average by -0.7 °F.

  • The forecast for the next days in Alamosa predicts temperatures to be around 23 °F, close to the historical average.

  • In general, the average temperature in Alamosa at the beginning of September is 24.4 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 23.7 °F by the end of September.

    • Rain 🌧️

  • Alamosa experiences moderate rainfall in September, with an average of 8 rainy days and a total precipitation of 43.8 mm.

    • More

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

Average dry days
22
Dry days
Average rainy days
8
Rainy days
Average snowy days
0
Snow days
Average temperatures
23°/7°
Temperatures
Average wind speed
19 km/h
Avg max wind
Average humidity
49 %
Avg humidity

Alamosa Weather September

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

Temperatures trend during September in Alamosa

See the weather trend as well as the moving average line

September weather in Alamosa day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Partly cloudy
Partly cloudy
 25° /9° 0 mm 7
Sept. 2 Sunny
Sunny
 26° /8° 0 mm 7
Sept. 3 Sunny
Sunny
 26° /8° 0 mm 7
Sept. 4 Cloudy
Cloudy
 27° /10° 0.4 mm 7
Sept. 5 Moderate or heavy rain shower
Moderate or heavy rain shower
 21° /8° 39.7 mm 5
Sept. 6 Sunny
Sunny
 22° /7° 1.8 mm 6
Sept. 7 Overcast
Overcast
 24° /8° 0 mm 5
Sept. 8 Sunny
Sunny
 25° /7° 0 mm 7
Sept. 9 Sunny
Sunny
 26° /8° 0 mm 7
Sept. 10 Moderate or heavy rain shower
Moderate or heavy rain shower
 25° /9° 1.4 mm 6
Sept. 11 Moderate rain at times
Moderate rain at times
 23° /8° 2 mm 5
Sept. 12 Sunny
Sunny
 21° /9° 5.8 mm 5
Sept. 13 Sunny
Sunny
 22° /9° 4.1 mm 6
Sept. 14 Sunny
Sunny
 23° /5° 0 mm 6
Sept. 15 Moderate rain at times
Moderate rain at times
 23° /6° 0.6 mm 6
Sept. 16 Sunny
Sunny
 24° /6° 0 mm 1.8
Sept. 17 Sunny
Sunny
 24° /5° 0 mm 1.9
Sept. 18 Sunny
Sunny
 21° /8° 0 mm 1.9
Sept. 19 Partly cloudy
Partly cloudy
 23° /6° 0 mm 2
Sept. 20 Sunny
Sunny
 25° /10° 0 mm 0
Sept. 21 Sunny
Sunny
 22° /10° 0 mm 5
Sept. 22 Sunny
Sunny
 23° /9° 0 mm 5
Sept. 23 Sunny
Sunny
 25° /9° 0 mm 5
Sept. 24 Sunny
Sunny
 26° /11° 0 mm 5
Sept. 25 Sunny
Sunny
 24° /10° 0 mm 5
Sept. 26 Sunny
Sunny
 25° /9° 0 mm 5
Sept. 27 Sunny
Sunny
 24° /10° 0 mm 5
Sept. 28 Sunny
Sunny
 22° /6° 0 mm 4
Sept. 29 Sunny
Sunny
 19° /7° 0 mm 4
Sept. 30 Thundery outbreaks possible
Thundery outbreaks possible
 26° /9° 0 mm 6
Next
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.
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Alamosa in September - FAQ

What are the expected maximum and minimum temperatures in Alamosa during September?
Enjoy moderate daytime temperatures of up to 23° 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?
In September, Alamosa can expect light to moderate rainfall, totaling 43.8 mm across approximately 8 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Alamosa during September?
The average wind speed in Alamosa during September is 19 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 💧

UV exposure in Alamosa during September

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

Quick links

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Location coordinates Where is Alamosa?

Get accurate weather forecasts for Alamosa, located at latitude 37.469 and longitude -105.87. Stay updated with localized weather information tailored for Alamosa.

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