September weather forecast and climate
Windsor, CO

The stonework around the Cache la Poudre River dam section in Windsor, Colorado
The stonework around the Cache la Poudre River dam section in Windsor, Colorado

Weather in September

The first month of the autumn, September, is also a moderately hot month in Windsor, Colorado, with temperature in the range of an average low of 52.7°F (11.5°C) and an average high of 79.7°F (26.5°C).

Temperature

In Windsor, Colorado, the average high-temperature slightly decreases, from a tropical 87.4°F (30.8°C) in August, to a warm 79.7°F (26.5°C). In Windsor, in September, the average low-temperature is 52.7°F (11.5°C).

Humidity

In September, the average relative humidity in Windsor is 43%.

Rainfall

In September, the rain falls for 5.9 days. Throughout September, 0.51" (13mm) of precipitation is accumulated. Throughout the year, there are 93.1 rainfall days, and 10.2" (259mm) of precipitation is accumulated.

Snowfall

June through September are months without snowfall.

Daylight

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

Sunshine

The average sunshine in Windsor is 10.8h.

UV index

In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from the exposure to the Sun's UV rays for ordinary individuals.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
Take precautions - Protection against sunburn is recommended. 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.
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FAQ

What is the average humidity in September in Windsor?

In September, the average relative humidity in Windsor is 43%.

How many days does it rain in September in Windsor?

In Windsor, in September, it is raining for 5.9 days, with typically 0.51" (13mm) of accumulated precipitation.

When it does not snow in Windsor?

In Windsor snow does not fall in June through September.

Does it snow in Windsor in September?

In Windsor, Colorado, in September, it doesn't snow. In October, it regularly snows.

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

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

How long on average sun shines in September in Windsor?

In September, the average sunshine in Windsor is 10.8h.

What is the UV index reading in September in Windsor?

In Windsor, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium hazard to health from the exposure to the Sun's UV radiation.

Average temperature in September
Windsor, CO

Average temperature in September - Windsor, CO
  • Average high temperature in September: 79.7°F

The warmest month (with the highest average high temperature) is July (89.1°F).
The month with the lowest average high temperature is December (39.2°F).

  • Average low temperature in September: 52.7°F

The month with the highest average low temperature is July (61°F).
The coldest month (with the lowest average low temperature) is December (20.3°F).

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Average pressure in September
Windsor, CO

Average pressure in September - Windsor, CO
  • Average pressure in September: 29.98"

The month with the highest atmospheric pressure is January (30.14").
The month with the lowest atmospheric pressure is June (29.89").

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Average wind speed in September
Windsor, CO

Average wind speed in September - Windsor, CO
  • Average wind speed in September: 6mph

The windiest month (with the highest average wind speed) is April (7.7mph).
The calmest months (with the lowest average wind speed) are August and December (5.8mph).

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Average humidity in September
Windsor, CO

Average humidity in September - Windsor, CO
  • Average humidity in September: 43%

Months with the highest relative humidity are February and December (63%).
The month with the lowest relative humidity is August (42%).

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Average rainfall in September
Windsor, CO

Average rainfall in September - Windsor, CO
  • Average rainfall in September: 0.51"

The wettest month (with the highest rainfall) is May (2.24").
The driest month (with the least rainfall) is January (0.35").

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Average rainfall days in September
Windsor, CO

Average rainfall days in September - Windsor, CO
  • Average rainfall days in September: 5.9 days

The month with the highest number of rainy days is May (14.3 days).
The month with the least rainy days is January (3.8 days).

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Average snowfall in September
Windsor, CO

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

The month with the highest snowfall is February (4.41").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Windsor, CO

Average snowfall days in September - Windsor, CO
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (9.8 days).
Months with the least snowfall days are June, July, August and September (0 days).

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

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

The month with the longest days is June (Average daylight: 15h).
The month with the shortest days is December (Average daylight: 9.3h).

  • Average sunshine in September: 10.8h

The month with the most sunshine is June (Average sunshine: 11.8h).
Months with the least sunshine are February and December (Average sunshine: 6.7).

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Average sunshine days in September
Windsor, CO

Average sunshine days in September - Windsor, CO
  • Average sunshine days in September: 21.3 days

The month with the most sunshine days is January (22.8 days).
The month with the least sunshine days is May (12.3 days).

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Average UV index in September
Windsor, CO

Average UV index in September - Windsor, CO
  • Average UV index in September: 4

Months with the highest UV index are June, July and August (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in September
Windsor, CO

Average cloud cover in September - Windsor, CO
  • Average cloud cover in September: 17

Months with the most cloud cover are February and April (Cloud cover 28).
Months with the least cloud cover are June, August and September (Cloud cover 17).

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Average visibility in September
Windsor, CO

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

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

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