September weather forecast and climate
Simla, CO

Weather in September

September, the first month of the autumn, in Simla, is also a moderately hot month, with average temperature fluctuating between 55.8°F (13.2°C) and 76.8°F (24.9°C).

Temperature

In September, the average high-temperature slightly decreases, from a warm 84°F (28.9°C) in August, to a still moderately hot 76.8°F (24.9°C). In Simla, the average low-temperature is 55.8°F (13.2°C).

Humidity

Months with the lowest humidity in Simla are June and September, with an average relative humidity of 46%.

Rainfall

In Simla, it is raining for 8.2 days, with typically 0.55" (14mm) of accumulated precipitation. Throughout the year, in Simla, there are 83.6 rainfall days, and 9.41" (239mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Simla are January through May, September through December. September is the first month it typically snows. Throughout September, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow. In Simla, during the entire year, snow falls for 26.7 days, and aggregates up to 9.02" (229mm) of snow.

Daylight

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

Sunshine

The average sunshine in September is 10.6h.

UV index

In September, the average daily maximum UV index in Simla, Colorado, is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from unsafe exposure to the UV radiation for the average person.
Note: In September, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the temperature in September in Simla?

The average high-temperature, in September, in Simla, Colorado, is 76.8°F (24.9°C), while the average low-temperature is 55.8°F (13.2°C).

What is the least humid month in Simla?

June and September, with an average relative humidity of 46%, are the least humid months in Simla, Colorado.

What is the average humidity in September in Simla?

The average relative humidity in September in Simla is 46%.

How much does it rain in Simla in September?

In Simla, in September, it is raining for 8.2 days, with typically 0.55" (14mm) of accumulated precipitation.

When does it start to snow in Simla?

September is the first month it typically snows. Throughout September, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow.

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

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

How many hours of sunshine does Simla have in September?

In September, the average sunshine in Simla, Colorado, is 10.6h.

What is the UV index intensity in September in Simla?

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

Average temperature in September
Simla, CO

Average temperature in September - Simla, CO
  • Average high temperature in September: 76.8°F

The warmest month (with the highest average high temperature) is July (86°F).
The month with the lowest average high temperature is December (39°F).

  • Average low temperature in September: 55.8°F

The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is December (22.3°F).

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Average pressure in September
Simla, CO

Average pressure in September - Simla, CO
  • Average pressure in September: 29.95"

Months with the highest atmospheric pressure are January and December (30.09").
The month with the lowest atmospheric pressure is June (29.84").

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Average wind speed in September
Simla, CO

Average wind speed in September - Simla, CO
  • Average wind speed in September: 9.7mph

The windiest month (with the highest average wind speed) is April (12.2mph).
The calmest month (with the lowest average wind speed) is August (9.3mph).

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Average humidity in September
Simla, CO

Average humidity in September - Simla, CO
  • Average humidity in September: 46%

The month with the highest relative humidity is February (63%).
Months with the lowest relative humidity are June and September (46%).

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Average rainfall in September
Simla, CO

Average rainfall in September - Simla, CO
  • Average rainfall in September: 0.55"

The wettest month (with the highest rainfall) is May (1.77").
The driest month (with the least rainfall) is December (0.2").

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Average rainfall days in September
Simla, CO

Average rainfall days in September - Simla, CO
  • Average rainfall days in September: 8.2 days

The month with the highest number of rainy days is July (14.3 days).
The month with the least rainy days is November (1.7 days).

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Average snowfall in September
Simla, CO

Average snowfall in September - Simla, CO
  • Average snowfall in September: 0.04"

The month with the highest snowfall is February (1.93").
Months with the least snowfall are June, July and August (0").

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Average snowfall days in September
Simla, CO

Average snowfall days in September - Simla, CO
  • Average snowfall days in September: 0.1 days

The month with the highest number of snowfall days is February (6.1 days).
Months with the least snowfall days are June, July and August (0 days).

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

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

The month with the longest days is June (Average daylight: 14.9h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in September: 10.6h

Months with the most sunshine are June, July and August (Average sunshine: 11.8h).
The month with the least sunshine is February (Average sunshine: 6.6h).

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Average sunshine days in September
Simla, CO

Average sunshine days in September - Simla, CO
  • Average sunshine days in September: 18.4 days

The month with the most sunshine days is December (24.9 days).
The month with the least sunshine days is July (13.4 days).

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Average UV index in September
Simla, CO

Average UV index in September - Simla, 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
Simla, CO

Average cloud cover in September - Simla, CO
  • Average cloud cover in September: 16

Months with the most cloud cover are February and April (Cloud cover 27).
Months with the least cloud cover are June and September (Cloud cover 16).

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Average visibility in September
Simla, CO

Average visibility in September - Simla, 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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