Temperature
Pleasant by day, cold at night.
75°Ftypical September high
Typical range
September climate
September in Alamosa
United States · North America
Mild days with cool nights and plenty of sun.
One of the best months here
Daytime high
75°F
Lows around 45°F
Rain
A few rainy days
Sun
11.5 h/day
Air feel
Very dry
When to visit
Month-by-month fit
Best
Precipitation
A few rainy days. About 5 wet days this month.
17%wet-day frequency
AmountWet-day chance
Sunshine
Plenty of sun this month.
11.5 hSeptember sunshine
Heat & humidity by month
Very drySeptember Heat feel
Easy airWarm airHot air
Hourly temperature pattern
In September, afternoons feel about 66° and nights feel near 42°.
FrigidFreezingVery coldColdCoolComfortableWarmNight hours
Clear sky
Mostly clear skies this month.
72%September Clear sky
Clear skyCloud
Wind pattern
Calm winds are typical in September.
4 mphSeptember Calm
More detailIncludes daypart comfort
Typical September day
September late afternoons are around 72°F, easing to about 65°F in early evening.
Avg temp Typical range
Morning58°F
Rain4%
Cloud21%
Humid airLow
Sun intensityModerate
Best windowMidday70°F
Rain6%
Cloud28%
Humid airLow
Sun intensityStrong
Late afternoon72°F
Rain13%
Cloud42%
Humid airLow
Sun intensityStrong
Early evening65°F
Rain10%
Cloud36%
Humid airLow
Sun intensityMinimal
Data tableView month-by-month numbers
View month-by-month numbers
| Month | High°F | Low°F | Rainin | Wet days | Sunh | Humidity% |
|---|---|---|---|---|---|---|
| Jan | 37 | 10 | 0.6 | 4 | 9.0 | 62 |
| Feb | 42 | 16 | 0.6 | 4 | 9.9 | 57 |
| Mar | 52 | 25 | 0.8 | 5 | 11.0 | 49 |
| Apr | 60 | 31 | 1.1 | 6 | 11.8 | 43 |
| May | 69 | 39 | 1.2 | 7 | 13.1 | 41 |
| Jun | 80 | 48 | 0.7 | 6 | 13.5 | 37 |
| Jul | 84 | 53 | 1.2 | 9 | 13.1 | 49 |
| Aug | 81 | 52 | 1.2 | 8 | 12.3 | 52 |
| Sep | 75 | 45 | 1.0 | 5 | 11.5 | 49 |
| Oct | 63 | 34 | 0.9 | 4 | 10.3 | 49 |
| Nov | 49 | 24 | 0.5 | 3 | 9.4 | 50 |
| Dec | 38 | 13 | 0.6 | 4 | 8.7 | 59 |
Similar climates
Similar
Similar travel styleArcoUnited StatesSimilar travel styleAuroraUnited StatesSimilar travel styleArvadaUnited StatesSimilar travel styleAlturasUnited States
Want a side-by-side climate view? Compare Alamosa with Arco.
Climate data notePlanning guidance, not a forecast
Typical monthly values are based on long-term climate records. Useful for planning, not a forecast. Check the weather before you travel.
Sunshine: source type is not yet identified at metric level.
Local microclimates can vary by beach, neighborhood, trail, or elevation.
Last updated: Jul 31, 2026
Data & methodology