September weather forecast
Blue River, CO

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Weather in September

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

Temperature

The start of September signals a gentle decrease in the average high-temperature, transitioning from a comfortable 63.7°F (17.6°C) in August to a moderate 57.6°F (14.2°C). Despite drastic daytime highs, Blue River logs an average low-temperature reading of 33.4°F (0.8°C) throughout September.

Humidity

The average relative humidity in September in Blue River, Colorado, 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. Throughout the year, there are 110.4 rainfall days, and 24.09" (612mm) of precipitation is accumulated.

Snowfall

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

Daylight

In September, the average length of the day is 12h and 26min.
On the first day of the month, sunrise is at 6:33 am and sunset at 7:34 pm. On the last day of September, in Blue River, Colorado, sunrise is at 7:00 am and sunset at 6:47 pm MDT.

Sunshine

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

UV index

In September, the average daily maximum UV index is 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for the average person.
Note: The UV index of 2 during September translates into the following guidance:
While most people are not greatly affected by extended sun exposure, those with fair skin, babies, and children must always have protection. Around midday, solar radiation is most harmful; hence, exposure should be limited. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.
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Frequently asked questions

What are the temperatures in Blue River in September?

The high-temperature, in September, in Blue River, is 57.6°F (14.2°C), while the low-temperature averages to 33.4°F (0.8°C).

What is the average humidity in September in Blue River?

The average relative humidity in September in Blue River, Colorado, is 59%.

How much does it rain in Blue River in September?

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

How much does it snow in Blue River in September?

In Blue River, Colorado, during September, snow falls for 5.5 days and regularly aggregates up to 2.05" (52mm) of snow.

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

In Blue River, Colorado, the average day length in September is 12h and 26min.

When are sunrise and sunset in September in Blue River?

On the first day of September, sunrise is at 6:33 am and sunset at 7:34 pm. On the last day of the month, sunrise is at 7:00 am and sunset at 6:47 pm MDT.

How long on average sun shines in September in Blue River?

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

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

In September, the average daily maximum UV index in Blue River, Colorado, is 2. A UV Index estimate of 2, and below, represents a minimal hazard to health from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

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"Hg

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

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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: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).

  • Average sunshine in September: 10h and 3min

The month with the most sunshine is June (Average sunshine: 11h and 24min).
The month with the least sunshine is February (Average sunshine: 5h and 12min).

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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

The months with the highest UV index are May, June, July and August (UV index 3).
The 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

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

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Blue River, Colorado, USA

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