September weather forecast and climate
Blue River, CO

Weather in September

The first month of the autumn, September, is also a moderate month in Blue River, Colorado, with temperature in the range of an average low of 33.4°F (0.8°C) and an average high of 57.6°F (14.2°C).

Temperature

In September, the average high-temperature slightly decreases, from a comfortable 63.7°F (17.6°C) in August, to a moderate 57.6°F (14.2°C). In Blue River, Colorado, the average low-temperature is 33.4°F (0.8°C).

Humidity

In September, the average relative humidity in Blue River is 59%.

Rainfall

In Blue River, during September, the rain falls for 11.5 days and regularly aggregates up to 1.46" (37mm) of precipitation. In Blue River, during the entire year, the rain falls for 110.4 days and collects up to 24.09" (612mm) of precipitation.

Snowfall

January through December are months with snowfall. In Blue River, during September, snow falls for 5.5 days and regularly aggregates up to 2.05" (52mm) of snow. Throughout the year, there are 158 snowfall days, and 118.82" (3018mm) of snow is accumulated.

Daylight

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

Sunshine

In September, the average sunshine in Blue River is 10.5h.

UV index

In Blue River, the average daily maximum UV index is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from the exposure to the Sun's UV radiation for ordinary individuals.
Note: The average daily UV index of 2 transform into the following instructions:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. 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 temperature in September in Blue River?

In Blue River, Colorado, in September, the average high-temperature is 57.6°F (14.2°C), and the average low-temperature is 33.4°F (0.8°C).

What is the average humidity in September in Blue River?

In September, the average relative humidity in Blue River is 59%.

How many days does it rain in September in Blue River?

In Blue River, Colorado, in September, during 11.5 rainfall days, 1.46" (37mm) of precipitation is typically accumulated.

How many days does it snow in September in Blue River?

In Blue River, in September, snow falls for 5.5 days, with typically accumulated 2.05" (52mm) of snow.

What is the average length of the day in September in Blue River?

The average length of the day in September in Blue River, Colorado, is 12.4h.

How many hours of sunshine does Blue River have in September?

In Blue River, the average sunshine in September is 10.5h.

What is the UV index reading in September in Blue River?

In Blue River, Colorado, the average daily maximum UV index in September is 2. A UV Index reading of 2, and below, represents a minimal hazard to health from the exposure to the Sun's UV radiation.

Average temperature in September
Blue River, CO

Average temperature in September - Blue River, CO
  • Average high temperature in September: 57.6°F

The warmest month (with the highest average high temperature) is July (65.8°F).
The month with the lowest average high temperature is December (21.2°F).

  • Average low temperature in September: 33.4°F

The month with the highest average low temperature is July (40.1°F).
The coldest months (with the lowest average low temperature) are January and December (0.7°F).

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Average pressure in September
Blue River, CO

Average pressure in September - Blue River, CO
  • Average pressure in September: 30.05"

The month with the highest atmospheric pressure is January (30.19").
Months with the lowest atmospheric pressure are April and May (29.94").

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Average wind speed in September
Blue River, CO

Average wind speed in September - Blue River, CO
  • Average wind speed in September: 5.2mph

The windiest month (with the highest average wind speed) is February (7mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).

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Average humidity in September
Blue River, CO

Average humidity in September - Blue River, 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 (54%).

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Average rainfall in September
Blue River, CO

Average rainfall in September - Blue River, CO
  • Average rainfall in September: 1.46"

The wettest month (with the highest rainfall) is July (3.35").
The driest month (with the least rainfall) is November (1.14").

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Average rainfall days in September
Blue River, CO

Average rainfall days in September - Blue River, CO
  • Average rainfall days in September: 11.5 days

The month with the highest number of rainy days is July (22.8 days).
The month with the least rainy days is November (2.8 days).

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Average snowfall in September
Blue River, CO

Average snowfall in September - Blue River, CO
  • Average snowfall in September: 2.05"

The month with the highest snowfall is May (19.69").
The month with the least snowfall is July (0.24").

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Average snowfall days in September
Blue River, CO

Average snowfall days in September - Blue River, CO
  • Average snowfall days in September: 5.5 days

The month with the highest number of snowfall days is April (22.8 days).
The month with the least snowfall days is July (1.3 days).

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Average daylight in September /
Average sunshine in September
Blue River, CO

Average daylight in September / Average sunshine in September - Blue River, 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: 10.5h

The month with the most sunshine is June (Average sunshine: 11.4h).
The month with the least sunshine is February (Average sunshine: 5.2h).

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Average sunshine days in September
Blue River, CO

Average sunshine days in September - Blue River, CO
  • Average sunshine days in September: 14.1 days

The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is July (5.8 days).

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Average UV index in September
Blue River, CO

Average UV index in September - Blue River, CO
  • Average UV index in September: 2

Months with the highest UV index are May, June, July and August (UV index 3).
Months with the lowest UV index are February and December (UV index 1).

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Average cloud cover in September
Blue River, CO

Average cloud cover in September - Blue River, CO
  • Average cloud cover in September: 22

The month with the most cloud cover is February (Cloud cover 54).
The month with the least cloud cover is June (Cloud cover 19).

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Average visibility in September
Blue River, CO

Average visibility in September - Blue River, CO
  • Average visibility in September: 6mi

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

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