September weather forecast
Windsor, CO

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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

September conveys the start of fall in Windsor, Colorado, with temperatures having a drop to 79.7°F (26.5°C). The city witnesses no snowfall, providing a fully dry, autumnal backdrop for the locals. The days become visibly shorter, and the leaf color begins to morph into warm hues. Evenings carry a mild chill that marks a clear departure from the warmth of summer. The essence of September’s weather reflects the undeniable onset of autumn, with cooler temperatures and vibrant fall foliage.

Temperature

In Windsor, the average high-temperature in September gently drops from a tropical 87.4°F (30.8°C) in August to a moderately hot 79.7°F (26.5°C). Windsor experiences a drastic reduction from day temperatures to an average low of 52.7°F (11.5°C) in September.

Humidity

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

Rainfall

In September, in Windsor, 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

In Windsor, snow does not fall in June through September.

Daylight

The average length of the day in September is 12h and 27min.
On the first day of the month, sunrise is at 6:27 am and sunset at 7:31 pm. On the last day of September, sunrise is at 6:55 am and sunset at 6:42 pm MDT.

Sunshine

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

UV index

In Windsor, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for average individuals.
Note: The maximum daily UV index of 4 during September translates into the following directions:
Take precautions. Light skin individuals may get burned in less than 30 minutes. Minimize direct exposure to the Sun during midday when its radiation is at its peak. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.
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Frequently asked questions

What are the temperatures in Windsor in September?

The high-temperature, in September, in Windsor, records 79.7°F (26.5°C), while the low-temperature is 52.7°F (11.5°C). In August, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which factors the actual air temperature with the relative humidity, is calculated to be 87.8°F (31°C).

What is the average humidity in September in Windsor?

The average relative humidity in September in Windsor, Colorado, is 43%.

How much does it rain in Windsor in September?

In Windsor, Colorado, in September, during 5.9 rainfall days, 0.51" (13mm) of precipitation is typically accumulated.

When it does not snow in Windsor?

In Windsor, Colorado, 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.

How many hours of daylight does Windsor have in September?

The average day length in September is 12h and 27min.

When is the sunrise / sunset in September in Windsor?

On the first day of September, sunrise is at 6:27 am and sunset at 7:31 pm. On the last day of the month, sunrise is at 6:55 am and sunset at 6:42 pm MDT.

How many hours of sunshine does Windsor have in September?

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

What is the UV index intensity in September in Windsor?

In Windsor, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium hazard to health from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

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"Hg

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

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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%

The 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").
The 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).
The 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: 12h and 2min

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in September: 10h and 5min

The month with the most sunshine is June (Average sunshine: 11h and 48min).
The months with the least sunshine are February and December (Average sunshine: 6h and 42min).

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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

The months with the highest UV index are June, July and August (UV index 6).
The 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

The months with the most cloud cover are February and April (Cloud cover 28).
The 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

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

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Windsor, Colorado, USA

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