September weather forecast and climate
Lafayette, CO

Weather in September

The first month of the autumn, September, is also a moderately hot month in Lafayette, Colorado, with average temperature fluctuating between 50.7°F (10.4°C) and 76.6°F (24.8°C).

Temperature

In Lafayette, the average high-temperature in September marginally drops, from 84.2°F (29°C) in August, to a still moderately hot 76.6°F (24.8°C). The average low-temperature, in September, is 50.7°F (10.4°C).

Humidity

The average relative humidity in Lafayette is 43%.

Rainfall

In Lafayette, during 7.7 rainfall days, 0.35" (9mm) of precipitation is typically accumulated. In Lafayette, during the entire year, the rain falls for 96.7 days and collects up to 5.63" (143mm) of precipitation.

Snowfall

In Lafayette, Colorado, snow does not fall in June through September.

Daylight

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

Sunshine

In Lafayette, the average sunshine in September is 11.1h.

UV index

In September, the average daily maximum UV index in Lafayette is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from the exposure to the Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 4 interpret into the following advice:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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.
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FAQ

What is the temperature in September in Lafayette?

In Lafayette, in September, the average high-temperature is 76.6°F (24.8°C), and the average low-temperature is 50.7°F (10.4°C).

What is the average humidity in September in Lafayette?

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

How much does it rain in Lafayette in September?

In Lafayette, Colorado, in September, during 7.7 rainfall days, 0.35" (9mm) of precipitation is typically accumulated.

Does it snow in Lafayette in September?

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

When it does not snow in Lafayette?

June through September are months without snowfall in Lafayette.

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

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

How many hours of sunshine does Lafayette have in September?

In September, the average sunshine in Lafayette is 11.1h.

What is the UV index intensity in September in Lafayette?

In September, the average daily maximum UV index in Lafayette is 4. A UV Index of 3 to 5 symbolizes a medium health risk from unsafe exposure to the Sun's UV rays.

Average temperature in September
Lafayette, CO

Average temperature in September - Lafayette, CO
  • Average high temperature in September: 76.6°F

The warmest month (with the highest average high temperature) is July (85.5°F).
The month with the lowest average high temperature is December (39.4°F).

  • Average low temperature in September: 50.7°F

The month with the highest average low temperature is July (59°F).
The coldest months (with the lowest average low temperature) are February and December (20.7°F).

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Average pressure in September
Lafayette, CO

Average pressure in September - Lafayette, CO
  • Average pressure in September: 30.01"

The month with the highest atmospheric pressure is January (30.14").
Months with the lowest atmospheric pressure are April and June (29.91").

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Average wind speed in September
Lafayette, CO

Average wind speed in September - Lafayette, CO
  • Average wind speed in September: 5.6mph

The windiest months (with the highest average wind speed) are March and April (6.5mph).
The calmest month (with the lowest average wind speed) is September (5.6mph).

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Average humidity in September
Lafayette, CO

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

The month with the highest relative humidity is February (67%).
The month with the lowest relative humidity is August (41%).

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Average rainfall in September
Lafayette, CO

Average rainfall in September - Lafayette, CO
  • Average rainfall in September: 0.35"

The wettest months (with the highest rainfall) are May and July (0.87").
The driest month (with the least rainfall) is January (0.16").

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Average rainfall days in September
Lafayette, CO

Average rainfall days in September - Lafayette, CO
  • Average rainfall days in September: 7.7 days

The month with the highest number of rainy days is May (14.4 days).
The month with the least rainy days is November (3.5 days).

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Average snowfall in September
Lafayette, CO

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

The month with the highest snowfall is February (2.68").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Lafayette, CO

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

The month with the highest number of snowfall days is February (8.4 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
Lafayette, CO

Average daylight in September / Average sunshine in September - Lafayette, 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: 9.4h).

  • Average sunshine in September: 11.1h

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

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Average sunshine days in September
Lafayette, CO

Average sunshine days in September - Lafayette, CO
  • Average sunshine days in September: 18 days

The month with the most sunshine days is November (23.7 days).
The month with the least sunshine days is July (10 days).

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Average UV index in September
Lafayette, CO

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

Months with the highest UV index are 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
Lafayette, CO

Average cloud cover in September - Lafayette, CO
  • Average cloud cover in September: 15

Months with the most cloud cover are April and May (Cloud cover 26).
The month with the least cloud cover is September (Cloud cover 15).

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Average visibility in September
Lafayette, CO

Average visibility in September - Lafayette, 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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