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
September heralds a minor drop in average high-temperature, sliding from August's moderately hot 73.9°F (23.3°C) to a comfortable 65.8°F (18.8°C). Grass Creek's average low-temperature in the month of September is recorded at a chilly 45.5°F (7.5°C).Humidity
In Grass Creek, the average relative humidity in September is 46%.Rainfall
In September, the rain falls for 8.9 days. Throughout September, 0.94" (24mm) of precipitation is accumulated. In Grass Creek, during the entire year, the rain falls for 93.8 days and collects up to 12.05" (306mm) of precipitation.Snowfall
Months with snowfall in Grass Creek are January through June, September through December. September is the first month it typically snows in Grass Creek. Throughout September, in the average 0.8 snowfall days, it receives 0.75" (19mm) of snow. In Grass Creek, during the entire year, snow falls for 55.8 days and aggregates up to 30.31" (770mm) of snow.Daylight
In September, the average length of the day in Grass Creek is 12h and 29min.On the first day of September, sunrise is at 6:38 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 7:12 am and sunset at 6:56 pm MDT.
Sunshine
In September, the average sunshine is 10.4h.UV index
The average daily maximum UV index in September in Grass Creek is 3. A UV Index estimate of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for the average person.Note: In September, the maximum UV index of 3 suggests these recommendations:
Make use of precautions - It is urged to ward off sun damage. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Take into account! The reflection from snow can nearly double the Sun's UV radiation intensity.
Frequently asked questions
What are the temperatures in Grass Creek in September?
What is the average humidity in September in Grass Creek?
How many days does it rain in September in Grass Creek?
When does it start to snow in Grass Creek?
How many hours of daylight does Grass Creek have in September?
What time are sunrise and sunset in September in Grass Creek?
How long on average sun shines in September in Grass Creek?
How high is the UV index in September in Grass Creek?
Average temperature in September
Grass Creek, WY
- Average high temperature in September: 65.8°F
The warmest month (with the highest average high temperature) is July (76.1°F).
The month with the lowest average high temperature is December (27.3°F).
- Average low temperature in September: 45.5°F
The month with the highest average low temperature is July (53.8°F).
The coldest month (with the lowest average low temperature) is December (11.8°F).
Average pressure in September
Grass Creek, WY
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in September
Grass Creek, WY
- Average wind speed in September: 6.1mph
The windiest month (with the highest average wind speed) is January (7.9mph).
The calmest month (with the lowest average wind speed) is August (5.7mph).
Average humidity in September
Grass Creek, WY
- Average humidity in September: 46%
The month with the highest relative humidity is February (77%).
The month with the lowest relative humidity is July (43%).
Average rainfall in September
Grass Creek, WY
- Average rainfall in September: 0.94"
The wettest month (with the highest rainfall) is May (2.48").
The driest month (with the least rainfall) is January (0.2").
Average rainfall days in September
Grass Creek, WY
- Average rainfall days in September: 8.9 days
The month with the highest number of rainy days is May (16.9 days).
The month with the least rainy days is January (1.6 days).
Average snowfall in September
Grass Creek, WY
- Average snowfall in September: 0.75"
The month with the highest snowfall is April (6.3").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Grass Creek, WY
- Average snowfall days in September: 0.8 days
The month with the highest number of snowfall days is April (9.4 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Grass Creek, WY
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in September: 10h and 2min
The month with the most sunshine is July (Average sunshine: 11h and 42min).
The month with the least sunshine is February (Average sunshine: 6h and 24min).
Average sunshine days in September
Grass Creek, WY
- Average sunshine days in September: 18.7 days
The month with the most sunshine days is January (25 days).
The month with the least sunshine days is May (10.2 days).
Average UV index in September
Grass Creek, WY
- Average UV index in September: 3
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).
Average cloud cover in September
Grass Creek, WY
- Average cloud cover in September: 17
The month with the most cloud cover is April (Cloud cover 35).
The months with the least cloud cover are July and September (Cloud cover 17).
Average visibility in September
Grass Creek, 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).
Grass Creek, Wyoming, USA
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