Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
During the shift to September, Sleepy Hollow records a mild decrease in average high-temperature, moving from a warm 82.4°F (28°C) in August to a still moderately hot 73.6°F (23.1°C). The month of September records an average low-temperature of 54.3°F (12.4°C) in Sleepy Hollow.Humidity
In Sleepy Hollow, the average relative humidity in September is 44%.Rainfall
In Sleepy Hollow, in September, it is raining for 10.2 days, with typically 1.02" (26mm) of accumulated precipitation. Throughout the year, there are 108.9 rainfall days, and 15.59" (396mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, September through December. September is the first month it typically snows in Sleepy Hollow. Throughout September, in the average 0.4 snowfall days, it receives 0.31" (8mm) of snow. In Sleepy Hollow, during the entire year, snow falls for 50.5 days and aggregates up to 19.53" (496mm) of snow.Daylight
In Sleepy Hollow, the average length of the day in September is 12h and 30min.On the first day of the month, sunrise is at 6:25 am and sunset at 7:37 pm. On the last day of September, in Sleepy Hollow, sunrise is at 6:59 am and sunset at 6:43 pm MDT.
Sunshine
The average sunshine in September in Sleepy Hollow is 10.8h.UV index
In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for the average person.Note: In September, a daily maximum UV index of 4 leads to the following instructions:
Adopt protective measures - Suggestions to resist sunburn are offered. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly. Be aware! The intensity of the Sun's UV radiation can be amplified nearly twice due to snow reflection.
Frequently asked questions
What are September temperatures in Sleepy Hollow?
What is the average humidity in September in Sleepy Hollow?
How many days does it rain in September in Sleepy Hollow?
When does it start to snow in Sleepy Hollow?
How many hours of daylight does Sleepy Hollow have in September?
When are sunrise and sunset in September in Sleepy Hollow?
How many hours of sunshine does Sleepy Hollow have in September?
What is the UV index reading in September in Sleepy Hollow?
Average temperature in September
Sleepy Hollow, WY
- Average high temperature in September: 73.6°F
The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is December (29.7°F).
- Average low temperature in September: 54.3°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is February (16.7°F).
Average pressure in September
Sleepy Hollow, WY
- Average pressure in September: 29.93"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in September
Sleepy Hollow, WY
- Average wind speed in September: 10.1mph
The windiest month (with the highest average wind speed) is April (11.2mph).
The calmest months (with the lowest average wind speed) are July and August (9.1mph).
Average humidity in September
Sleepy Hollow, WY
- Average humidity in September: 44%
The month with the highest relative humidity is January (78%).
The month with the lowest relative humidity is August (41%).
Average rainfall in September
Sleepy Hollow, WY
- Average rainfall in September: 1.02"
The wettest month (with the highest rainfall) is May (3.11").
The driest month (with the least rainfall) is January (0.39").
Average rainfall days in September
Sleepy Hollow, WY
- Average rainfall days in September: 10.2 days
The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is February (1.5 days).
Average snowfall in September
Sleepy Hollow, WY
- Average snowfall in September: 0.31"
The month with the highest snowfall is April (3.82").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Sleepy Hollow, WY
- Average snowfall days in September: 0.4 days
The month with the highest number of snowfall days is February (9.1 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Sleepy Hollow, WY
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in September: 10h and 5min
The months with the most sunshine are July and August (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 36min).
Average sunshine days in September
Sleepy Hollow, WY
- Average sunshine days in September: 16.4 days
The month with the most sunshine days is December (22.4 days).
The month with the least sunshine days is May (9.3 days).
Average UV index in September
Sleepy Hollow, WY
- 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, April, November and December (UV index 2).
Average cloud cover in September
Sleepy Hollow, WY
- Average cloud cover in September: 18
The month with the most cloud cover is February (Cloud cover 43).
The month with the least cloud cover is August (Cloud cover 16).
Average visibility in September
Sleepy Hollow, WY
- 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).
Sleepy Hollow, Wyoming, USA
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