September weather forecastAlamosa, CO
September
Weather in September
The first month of the autumn, September, is also an agreeable month in Alamosa, Colorado, with an average temperature varying between 45.5°F (7.5°C) and 72.3°F (22.4°C).Temperature
The arrival of September suggests a slight decrease in the average high-temperature, moving from a warm 78.6°F (25.9°C) in August to a pleasant 72.3°F (22.4°C). Alamosa anticipates a considerable daily temperature fluctuation in September, with low temperatures averaging a chilly 45.5°F (7.5°C).Humidity
In Alamosa, the average relative humidity in September is 48%.Rainfall
In Alamosa, in September, during 7.5 rainfall days, 0.63" (16mm) of precipitation is typically accumulated. Throughout the year, in Alamosa, Colorado, there are 77.3 rainfall days, and 7.24" (184mm) of precipitation is accumulated.Snowfall
In Alamosa, snow does not fall in June through September.Daylight
The average length of the day in September is 12h and 25min.On the first day of the month, sunrise is at 6:34 am and sunset at 7:31 pm. On the last day of September, sunrise is at 6:58 am and sunset at 6:47 pm MDT.
Sunshine
The average sunshine in September is 11.3h.UV index
The average daily maximum UV index in September in Alamosa is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: The UV index of 4 during September translates into the following guidance:
Adopt protective measures - Suggestions to resist sunburn are offered. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Alamosa, CO
- Average high temperature in September: 72.3°F
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (31.3°F).
- Average low temperature in September: 45.5°F
The month with the highest average low temperature is July (50.5°F).
The coldest month (with the lowest average low temperature) is January (11.8°F).
Average pressure in September
Alamosa, CO
- Average pressure in September: 30.05"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is April (29.91"Hg).
Average wind speed in September
Alamosa, CO
- Average wind speed in September: 4.9mph
The windiest month (with the highest average wind speed) is April (7mph).
The calmest month (with the lowest average wind speed) is August (4.3mph).
Average humidity in September
Alamosa, CO
- Average humidity in September: 48%
The month with the highest relative humidity is January (80%).
The month with the lowest relative humidity is June (37%).
Average rainfall in September
Alamosa, CO
- Average rainfall in September: 0.63"
The wettest month (with the highest rainfall) is July (1.18").
The driest months (with the least rainfall) are November and December (0.31").
Average rainfall days in September
Alamosa, CO
- Average rainfall days in September: 7.5 days
The month with the highest number of rainy days is July (13.3 days).
The month with the least rainy days is November (2.1 days).
Average snowfall in September
Alamosa, CO
- Average snowfall in September: 0"
The months with the highest snowfall are January and March (3.5").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Alamosa, CO
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is February (7.2 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Alamosa, CO
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in September: 11h and 18min
The month with the most sunshine is June (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 6h and 48min).
Average sunshine days in September
Alamosa, CO
- Average sunshine days in September: 17.9 days
The month with the most sunshine days is November (25.8 days).
The month with the least sunshine days is July (13.3 days).
Average UV index in September
Alamosa, CO
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, October, November and December (UV index 2).
Average cloud cover in September
Alamosa, CO
- Average cloud cover in September: 12
The months with the most cloud cover are January and February (Cloud cover 25).
The months with the least cloud cover are June, September and October (Cloud cover 12).
Average visibility in September
Alamosa, CO
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and February (5mi).
