September weather forecastGrover, WY
September
Weather in September
September, the first month of the autumn in Grover, is still a comfortable month, with an average temperature ranging between max 65.7°F (18.7°C) and min 39.7°F (4.3°C).Temperature
As September begins, there is a decrease in the average high-temperature, falling from a moderately hot 74.8°F (23.8°C) in August to a refreshing 65.7°F (18.7°C). In September, the nighttime temperature plummets remarkably from the daily apex to a steady average of 39.7°F (4.3°C).Humidity
The average relative humidity in September is 52%.Rainfall
In Grover, in September, during 9.4 rainfall days, 1.3" (33mm) of precipitation is typically accumulated. In Grover, during the entire year, the rain falls for 109.5 days and collects up to 21.61" (549mm) of precipitation.Snowfall
Months with snowfall in Grover are January through June, September through December. September is the first month it typically snows. Throughout September, in the average 1 snowfall days, it receives 1.3" (33mm) of snow. In Grover, Wyoming, during the entire year, snow falls for 126.9 days and aggregates up to 106.65" (2709mm) of snow.Daylight
In Grover, the average length of the day in September is 12h and 29min.On the first day of the month, sunrise is at 6:49 am and sunset at 7:57 pm. On the last day of September, in Grover, sunrise is at 7:20 am and sunset at 7:06 pm MDT.
Sunshine
In Grover, the average sunshine in September is 10.1h.UV index
In Grover, the average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for average individuals.Note: The maximum daily UV index of 3 in September interprets into the following recommendations:
Exercise caution. The susceptibility of light skin individuals to burns is less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Alert! The snow's reflection can amplify the UV radiation of the Sun nearly twice.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Grover, WY
- Average high temperature in September: 65.7°F
The warmest month (with the highest average high temperature) is July (75.9°F).
The month with the lowest average high temperature is December (24.1°F).
- Average low temperature in September: 39.7°F
The month with the highest average low temperature is July (45.7°F).
The coldest month (with the lowest average low temperature) is January (5.4°F).
Average pressure in September
Grover, WY
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.29"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Grover, WY
- Average wind speed in September: 5.2mph
The windiest month (with the highest average wind speed) is June (5.7mph).
The calmest months (with the lowest average wind speed) are January and December (4.2mph).
Average humidity in September
Grover, WY
- Average humidity in September: 52%
The month with the highest relative humidity is February (93%).
The month with the lowest relative humidity is August (45%).
Average rainfall in September
Grover, WY
- Average rainfall in September: 1.3"
The wettest month (with the highest rainfall) is February (2.72").
The driest months (with the least rainfall) are July and August (0.63").
Average rainfall days in September
Grover, WY
- Average rainfall days in September: 9.4 days
The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (4.7 days).
Average snowfall in September
Grover, WY
- Average snowfall in September: 1.3"
The month with the highest snowfall is February (19.96").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Grover, WY
- Average snowfall days in September: 1 days
The month with the highest number of snowfall days is December (21.7 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Grover, WY
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in September: 10h and 6min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 4h and 12min).
Average sunshine days in September
Grover, WY
- Average sunshine days in September: 17.5 days
The month with the most sunshine days is July (18.8 days).
The month with the least sunshine days is April (7 days).
Average UV index in September
Grover, WY
- Average UV index in September: 3
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 1).
Average cloud cover in September
Grover, WY
- Average cloud cover in September: 16
The month with the most cloud cover is February (Cloud cover 63).
The months with the least cloud cover are July and August (Cloud cover 12).
Average visibility in September
Grover, WY
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, August, September and October (6mi).
The months with the lowest visibility are January and February (3mi).
