September weather forecastSimla, CO
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Simla, Colorado, with temperature in the range of an average high of 76.8°F (24.9°C) and an average low of 55.8°F (13.2°C).Temperature
The beginning of September subtly marks a decrease in the average high-temperature, transitioning from 84°F (28.9°C) in August to a still warm 76.8°F (24.9°C). An average nighttime temperature of 55.8°F (13.2°C) is witnessed throughout September.Humidity
The months with the lowest humidity are June and September, with an average relative humidity of 46%.Rainfall
In Simla, Colorado, during September, the rain falls for 8.2 days and regularly aggregates up to 0.55" (14mm) of precipitation. Throughout the year, in Simla, there are 83.6 rainfall days, and 9.41" (239mm) of precipitation is accumulated.Snowfall
January through May, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow. Throughout the year, in Simla, there are 26.7 snowfall days, and 9.02" (229mm) of snow is accumulated.Daylight
In Simla, the average length of the day in September is 12h and 26min.On the first day of September in Simla, Colorado, sunrise is at 6:25 am and sunset at 7:26 pm. On the last day of the month, sunrise is at 6:52 am and sunset at 6:39 pm MDT.
Sunshine
In Simla, Colorado, the average sunshine in September is 10.6h.UV index
The average daily maximum UV index in September in Simla is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for the average person.Note: In September, the average maximum UV index of 5 translates into the following recommendations:
Adopt protective measures - Suggestions to resist sunburn are offered. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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).
Average pressure in September
Simla, CO
- Average pressure in September: 29.95"Hg
The months with the highest atmospheric pressure are January and December (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
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).
Average humidity in September
Simla, CO
- Average humidity in September: 46%
The month with the highest relative humidity is February (63%).
The months with the lowest relative humidity are June and September (46%).
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").
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).
Average snowfall in September
Simla, CO
- Average snowfall in September: 0.04"
The month with the highest snowfall is February (1.93").
The months with the least snowfall are June, July and August (0").
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).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Simla, CO
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 10h and 36min
The months with the most sunshine are June, July and August (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 6h and 36min).
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).
Average UV index in September
Simla, CO
- Average UV index in September: 5
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).
Average cloud cover in September
Simla, CO
- Average cloud cover in September: 16
The months with the most cloud cover are February and April (Cloud cover 27).
The months with the least cloud cover are June and September (Cloud cover 16).
Average visibility in September
Simla, 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).
