September weather forecast
Alma, CO

The beauty of the Bristlecone Pines up the hill looking over to Alma and Fairplay, Colorado
The beauty of the Bristlecone Pines up the hill looking over to Alma and Fairplay, Colorado

Weather in September

September, the first month of the autumn, in Alma, is still a mild month, with average temperature ranging between min 34.3°F (1.3°C) and max 58.8°F (14.9°C).

Temperature

In September, the average high-temperature slightly decreases, from a comfortable 64.4°F (18°C) in August, to a mild 58.8°F (14.9°C). In Alma, the average low-temperature is 34.3°F (1.3°C).

Humidity

In Alma, the average relative humidity is 59%.

Rainfall

In Alma, during September, the rain falls for 12.9 days and regularly aggregates up to 1.57" (40mm) of precipitation. Throughout the year, in Alma, there are 113.5 rainfall days, and 22.13" (562mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through December. In September, it is snowing for 5 days. Throughout September, 1.57" (40mm) of snow is accumulated. In Alma, during the entire year, snow falls for 139 days, and aggregates up to 101.69" (2583mm) of snow.

Daylight

In September, the average length of the day is 12.4h.

Sunshine

The average sunshine in Alma is 10.9h.

UV index

In September, the average daily maximum UV index in Alma is 3. A UV Index estimate of 3 to 5 represents a medium vulnerability from the exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 3 in September transform into the following instructions:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the average humidity in September in Alma?

The average relative humidity in September in Alma is 59%.

How many days does it rain in September in Alma?

In September, in Alma, Colorado, the rain falls for 12.9 days. Throughout September, 1.57" (40mm) of precipitation is accumulated.

How much does it snow in Alma in September?

In Alma, Colorado, during September, snow falls for 5 days and regularly aggregates up to 1.57" (40mm) of snow.

How many hours of daylight does Alma have in September?

The average length of the day in September is 12.4h.

How long on average sun shines in September in Alma?

The average sunshine in September is 10.9h.

How high is the UV index in September in Alma?

In September, the average daily maximum UV index in Alma, Colorado, is 3. A UV Index of 3 to 5 symbolizes a moderate health threat from unprotected exposure to the UV radiation.

Average temperature in September
Alma, CO

Average temperature in September - Alma, CO
  • Average high temperature in September: 58.8°F

The warmest month (with the highest average high temperature) is July (66.2°F).
The month with the lowest average high temperature is December (22.5°F).

  • Average low temperature in September: 34.3°F

The month with the highest average low temperature is July (40.5°F).
The coldest month (with the lowest average low temperature) is January (1.4°F).

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Average pressure in September
Alma, CO

Average pressure in September - Alma, CO
  • Average pressure in September: 30.06"

The month with the highest atmospheric pressure is January (30.2").
The month with the lowest atmospheric pressure is April (29.94").

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Average wind speed in September
Alma, CO

Average wind speed in September - Alma, CO
  • Average wind speed in September: 5mph

The windiest month (with the highest average wind speed) is June (6.4mph).
The calmest month (with the lowest average wind speed) is August (4.5mph).

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Average humidity in September
Alma, CO

Average humidity in September - Alma, CO
  • Average humidity in September: 59%

The month with the highest relative humidity is February (89%).
The month with the lowest relative humidity is June (52%).

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Average rainfall in September
Alma, CO

Average rainfall in September - Alma, CO
  • Average rainfall in September: 1.57"

The wettest month (with the highest rainfall) is July (3.39").
The driest month (with the least rainfall) is November (1.06").

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Average rainfall days in September
Alma, CO

Average rainfall days in September - Alma, CO
  • Average rainfall days in September: 12.9 days

The month with the highest number of rainy days is July (23.1 days).
The month with the least rainy days is November (2.8 days).

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Average snowfall in September
Alma, CO

Average snowfall in September - Alma, CO
  • Average snowfall in September: 1.57"

The month with the highest snowfall is May (16.26").
The month with the least snowfall is July (0.16").

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Average snowfall days in September
Alma, CO

Average snowfall days in September - Alma, CO
  • Average snowfall days in September: 5 days

The month with the highest number of snowfall days is April (18.8 days).
The month with the least snowfall days is July (0.5 days).

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Average daylight in September /
Average sunshine in September
Alma, CO

Average daylight in September / Average sunshine in September - Alma, CO
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.9h).
The month with the shortest days is December (Average daylight: 9.4h).

  • Average sunshine in September: 10.9h

The month with the most sunshine is June (Average sunshine: 11.6h).
The month with the least sunshine is February (Average sunshine: 5.6h).

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Average sunshine days in September
Alma, CO

Average sunshine days in September - Alma, CO
  • Average sunshine days in September: 11.6 days

The month with the most sunshine days is November (18.6 days).
The month with the least sunshine days is July (4.8 days).

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Average UV index in September
Alma, CO

Average UV index in September - Alma, CO
  • Average UV index in September: 3

Months with the highest UV index are July and August (UV index 4).
The month with the lowest UV index is February (UV index 1).

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Average cloud cover in September
Alma, CO

Average cloud cover in September - Alma, CO
  • Average cloud cover in September: 19

The month with the most cloud cover is February (Cloud cover 49).
The month with the least cloud cover is June (Cloud cover 17).

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Average visibility in September
Alma, CO

Average visibility in September - Alma, CO
  • Average visibility in September: 6mi

Months with the highest visibility are May, June, July, August, September and October (6mi).
Months with the lowest visibility are January, February, March, April and December (4mi).

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