September weather forecast and climate
Welby, CO

Weather in September

September, the first month of the autumn, in Welby, is also a moderately hot month, with average temperature fluctuating between 79.5°F (26.4°C) and 53.8°F (12.1°C).

Temperature

In Welby, the average high-temperature in September slightly decreases, from a hot 87.1°F (30.6°C) in August, to a moderately hot 79.5°F (26.4°C). In September, the average low-temperature is 53.8°F (12.1°C).

Humidity

The average relative humidity in September is 41%.

Rainfall

In Welby, in September, during 3.3 rainfall days, 0.16" (4mm) of precipitation is typically accumulated. Throughout the year, there are 48.3 rainfall days, and 3.19" (81mm) of precipitation is accumulated.

Snowfall

June through September are months without snowfall.

Daylight

The average length of the day is 12.4h.

Sunshine

In September, the average sunshine is 11.1h.

UV index

In Welby, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: In September, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against the skin and eye damage is obliged. 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 Welby?

The average high-temperature, in September, is 79.5°F (26.4°C), while the average low-temperature is 53.8°F (12.1°C).

What is the average humidity in September in Welby?

In Welby, Colorado, the average relative humidity in September is 41%.

How many days does it rain in September in Welby?

In Welby, in September, it is raining for 3.3 days, with typically 0.16" (4mm) of accumulated precipitation.

Does it snow in Welby in September?

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

When it does not snow in Welby?

June through September are months without snowfall in Welby, Colorado.

How many hours of daylight does Welby have in September?

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

How many hours of sunshine does Welby have in September?

In September, the average sunshine in Welby, Colorado, is 11.1h.

What is the UV index reading in September in Welby?

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

Average temperature in September
Welby, CO

Average temperature in September - Welby, CO
  • Average high temperature in September: 79.5°F

The warmest month (with the highest average high temperature) is July (88.3°F).
The month with the lowest average high temperature is December (41.2°F).

  • Average low temperature in September: 53.8°F

The month with the highest average low temperature is July (61.7°F).
The coldest month (with the lowest average low temperature) is December (21.9°F).

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Average pressure in September
Welby, CO

Average pressure in September - Welby, CO
  • Average pressure in September: 30"

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
Welby, CO

Average wind speed in September - Welby, CO
  • Average wind speed in September: 5.9mph

The windiest month (with the highest average wind speed) is April (6.9mph).
The calmest month (with the lowest average wind speed) is December (5.8mph).

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Average humidity in September
Welby, CO

Average humidity in September - Welby, CO
  • Average humidity in September: 41%

The month with the highest relative humidity is February (64%).
The month with the lowest relative humidity is August (39%).

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Average rainfall in September
Welby, CO

Average rainfall in September - Welby, CO
  • Average rainfall in September: 0.16"

The wettest month (with the highest rainfall) is July (0.59").
The driest months (with the least rainfall) are January and December (0.08").

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Average rainfall days in September
Welby, CO

Average rainfall days in September - Welby, CO
  • Average rainfall days in September: 3.3 days

The month with the highest number of rainy days is July (8.2 days).
The month with the least rainy days is February (1.2 days).

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Average snowfall in September
Welby, CO

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

The month with the highest snowfall is October (1.42").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Welby, CO

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

The month with the highest number of snowfall days is February (4.7 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
Welby, CO

Average daylight in September / Average sunshine in September - Welby, 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 and July (Average sunshine: 11.9h).
The month with the least sunshine is February (Average sunshine: 6.7h).

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Average sunshine days in September
Welby, CO

Average sunshine days in September - Welby, CO
  • Average sunshine days in September: 24.5 days

The month with the most sunshine days is December (28.5 days).
The month with the least sunshine days is July (19.6 days).

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Average UV index in September
Welby, CO

Average UV index in September - Welby, CO
  • Average UV index in September: 5

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
Welby, CO

Average cloud cover in September - Welby, CO
  • Average cloud cover in September: 14

Months with the most cloud cover are February, April and May (Cloud cover 25).
The month with the least cloud cover is September (Cloud cover 14).

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Average visibility in September
Welby, CO

Average visibility in September - Welby, 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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