September weather forecast and climate
Gunnison, CO

Weather in September

September, the first month of the autumn, in Gunnison, is still a comfortable month, with average temperature ranging between max 66.6°F (19.2°C) and min 37.9°F (3.3°C).

Temperature

In September, the average high-temperature slightly decreases, from an agreeable 73.2°F (22.9°C) in August, to an enjoyable 66.6°F (19.2°C). In September, in Gunnison, the average low-temperature is 37.9°F (3.3°C).

Humidity

In Gunnison, the average relative humidity is 53%.

Rainfall

September and November are months with the least rain in Gunnison when the rain falls for 8.1 days and typically aggregates up to 0.55" (14mm) of rain.

Snowfall

In Gunnison snow does not fall in July and September.

Daylight

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

Sunshine

In September, the average sunshine in Gunnison is 11.2h.

UV index

The average daily maximum UV index in Gunnison is 3. A UV Index value of 3 to 5 symbolizes a moderate health risk from unsafe exposure to the UV radiation for the average person.
Note: The daily maximum UV index of 3 interpret into the following advice:
Take precautions - Protection against the skin and eye damage is obliged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. 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 Gunnison?

In September, the average relative humidity in Gunnison, Colorado, is 53%.

What is the driest month in Gunnison?

September and November are months with the least rain in Gunnison when the rain falls for 8.1 days and typically aggregates up to 0.55" (14mm) of rain.

How much does it rain in Gunnison in September?

In September, the rain falls for 8.1 days. Throughout September, 0.55" (14mm) of precipitation is accumulated.

When it does not snow in Gunnison?

In Gunnison snow does not fall in July and September.

Does it snow in Gunnison in September?

In September, in Gunnison, it doesn't snow. August is the latest month when it typically snows.

What is the average length of the day in September in Gunnison?

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

How long on average sun shines in September in Gunnison?

The average sunshine in September in Gunnison is 11.2h.

What is the UV index intensity in September in Gunnison?

The average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a medium health risk from the exposure to the Sun's UV radiation.

Average temperature in September
Gunnison, CO

Average temperature in September - Gunnison, CO
  • Average high temperature in September: 66.6°F

The warmest month (with the highest average high temperature) is July (75.6°F).
The month with the lowest average high temperature is January (26.4°F).

  • Average low temperature in September: 37.9°F

The month with the highest average low temperature is July (44.1°F).
The coldest month (with the lowest average low temperature) is January (1.9°F).

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Average pressure in September
Gunnison, CO

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

The month with the highest atmospheric pressure is January (30.23").
Months with the lowest atmospheric pressure are April and May (29.94").

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Average wind speed in September
Gunnison, CO

Average wind speed in September - Gunnison, CO
  • Average wind speed in September: 4.8mph

The windiest months (with the highest average wind speed) are May and June (6.3mph).
The calmest months (with the lowest average wind speed) are January and December (4.5mph).

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Average humidity in September
Gunnison, CO

Average humidity in September - Gunnison, CO
  • Average humidity in September: 53%

The month with the highest relative humidity is February (88%).
The month with the lowest relative humidity is June (44%).

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Average rainfall in September
Gunnison, CO

Average rainfall in September - Gunnison, CO
  • Average rainfall in September: 0.55"

The wettest month (with the highest rainfall) is July (1.3").
The driest months (with the least rainfall) are September and November (0.55").

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Average rainfall days in September
Gunnison, CO

Average rainfall days in September - Gunnison, CO
  • Average rainfall days in September: 8.1 days

The month with the highest number of rainy days is July (15.3 days).
The month with the least rainy days is November (2.5 days).

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Average snowfall in September
Gunnison, CO

Average snowfall in September - Gunnison, CO
  • Average snowfall in September: 0"

The month with the highest snowfall is February (6.97").
Months with the least snowfall are July and September (0").

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Average snowfall days in September
Gunnison, CO

Average snowfall days in September - Gunnison, CO
  • Average snowfall days in September: 0.1 days

The month with the highest number of snowfall days is February (12.8 days).
The month with the least snowfall days is July (0 days).

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

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

The month with the longest days is June (Average daylight: 14.8h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in September: 11.2h

The month with the most sunshine is June (Average sunshine: 11.9h).
The month with the least sunshine is February (Average sunshine: 6.3h).

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Average sunshine days in September
Gunnison, CO

Average sunshine days in September - Gunnison, CO
  • Average sunshine days in September: 16.9 days

Months with the most sunshine days are October and November (21.2 days).
The month with the least sunshine days is July (9.7 days).

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Average UV index in September
Gunnison, CO

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

The month with the highest UV index is July (UV index 5).
Months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).

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Average cloud cover in September
Gunnison, CO

Average cloud cover in September - Gunnison, CO
  • Average cloud cover in September: 12

The month with the most cloud cover is February (Cloud cover 35).
Months with the least cloud cover are June and September (Cloud cover 12).

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Average visibility in September
Gunnison, CO

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

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

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