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
Alva records a mild change in average high-temperature during September, easing from 83.1°F (28.4°C) in August to a still moderately hot 74.3°F (23.5°C). In Alva, the nighttime temperature averages to a cool 53.6°F (12°C) during September.Humidity
The months with the lowest humidity are August and September, with an average relative humidity of 47%.Rainfall
In Alva, during September, the rain falls for 7.8 days and regularly aggregates up to 0.87" (22mm) of precipitation. Throughout the year, there are 99.9 rainfall days, and 12.99" (330mm) of precipitation is accumulated.Snowfall
Months with snowfall 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 0.08" (2mm) of snow. In Alva, Wyoming, during the entire year, snow falls for 52.1 days and aggregates up to 23.46" (596mm) of snow.Daylight
In Alva, the average length of the day in September is 12h and 30min.On the first day of September in Alva, sunrise is at 6:21 am and sunset at 7:33 pm. On the last day of the month, sunrise is at 6:55 am and sunset at 6:39 pm MDT.
Sunshine
In Alva, the average sunshine in September is 10.4h.UV index
In September, the average daily maximum UV index in Alva is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for the ordinary person.Note: A daily high UV index of 4 in September leads to these guidelines:
Ensure safety - Recommendations to avert sunburn are presented. Minimize direct exposure to the Sun during midday when its radiation is at its peak. Opt for tightly woven and loose clothing to enhance protection from the Sun. Be prepared! The intensity of the Sun's UV radiation can be amplified nearly double due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Alva in September?
What is the least humid month in Alva?
What is the average humidity in September in Alva?
How much does it rain in Alva in September?
When does it start snowing in Alva?
How many hours of daylight does Alva have in September?
What time are sunrise and sunset in September in Alva?
How many hours of sunshine does Alva have in September?
What is the UV index reading in September in Alva?
Average temperature in September
Alva, WY
- Average high temperature in September: 74.3°F
The warmest month (with the highest average high temperature) is July (85.8°F).
The month with the lowest average high temperature is December (30.4°F).
- Average low temperature in September: 53.6°F
The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is February (17.1°F).
Average pressure in September
Alva, WY
- Average pressure in September: 29.93"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in September
Alva, WY
- Average wind speed in September: 9.2mph
The windiest months (with the highest average wind speed) are January and October (10.4mph).
The calmest month (with the lowest average wind speed) is August (8.3mph).
Average humidity in September
Alva, WY
- Average humidity in September: 47%
The month with the highest relative humidity is January (80%).
The months with the lowest relative humidity are August and September (47%).
Average rainfall in September
Alva, WY
- Average rainfall in September: 0.87"
The wettest month (with the highest rainfall) is May (2.05").
The driest month (with the least rainfall) is January (0.43").
Average rainfall days in September
Alva, WY
- Average rainfall days in September: 7.8 days
The month with the highest number of rainy days is May (14.3 days).
The month with the least rainy days is January (2.8 days).
Average snowfall in September
Alva, WY
- Average snowfall in September: 0.08"
The month with the highest snowfall is April (4.88").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Alva, WY
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is February (10.3 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Alva, 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 2min
The month with the most sunshine is August (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 5h and 30min).
Average sunshine days in September
Alva, WY
- Average sunshine days in September: 19.8 days
The month with the most sunshine days is November (21.3 days).
The month with the least sunshine days is April (12.6 days).
Average UV index in September
Alva, 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, November and December (UV index 2).
Average cloud cover in September
Alva, WY
- Average cloud cover in September: 18
The month with the most cloud cover is February (Cloud cover 42).
The month with the least cloud cover is August (Cloud cover 15).
Average visibility in September
Alva, 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).
Alva, Wyoming, USA
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