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 signals a slight drop in average high-temperature, sliding from August's pleasant 73°F (22.8°C) to a refreshing 65.5°F (18.6°C). During September, Washam experiences a consistent low-temperature average of 45.5°F (7.5°C).Humidity
The average relative humidity in September is 42%.Rainfall
In Washam, in September, during 10.5 rainfall days, 0.94" (24mm) of precipitation is typically accumulated. Throughout the year, in Washam, Wyoming, there are 93.9 rainfall days, and 14.17" (360mm) of precipitation is accumulated.Snowfall
January through June, September through December are months with snowfall in Washam. September is the first month it typically snows. Throughout September, in the average 0.9 snowfall days, it receives 0.67" (17mm) of snow. Throughout the year, in Washam, there are 84.4 snowfall days, and 56.22" (1428mm) of snow is accumulated.Daylight
In September, the average length of the day is 12h and 27min.On the first day of September, sunrise is at 6:46 am and sunset at 7:51 pm. On the last day of the month, sunrise is at 7:15 am and sunset at 7:02 pm MDT.
Sunshine
In September, the average sunshine in Washam is 10.5h.UV index
In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: During September, 4 as the daily maximum UV index converts into the following advice:
Ensure safety - Imperative it is to shield skin and eyes from damage. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. 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
What is the usual temperature for Washam in September?
What is the average humidity in September in Washam?
How much does it rain in Washam in September?
When does it start to snow in Washam?
How many hours of daylight does Washam have in September?
What time are sunrise and sunset in September in Washam?
How many hours of sunshine does Washam have in September?
What is the UV index intensity in September in Washam?
Average temperature in September
Washam, WY
- Average high temperature in September: 65.5°F
The warmest month (with the highest average high temperature) is July (75°F).
The month with the lowest average high temperature is December (27°F).
- Average low temperature in September: 45.5°F
The month with the highest average low temperature is July (53.2°F).
The coldest month (with the lowest average low temperature) is December (12.2°F).
Average pressure in September
Washam, WY
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.28"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in September
Washam, WY
- Average wind speed in September: 7mph
The windiest month (with the highest average wind speed) is April (9.4mph).
The calmest month (with the lowest average wind speed) is July (6.5mph).
Average humidity in September
Washam, WY
- Average humidity in September: 42%
The month with the highest relative humidity is February (79%).
The months with the lowest relative humidity are July and August (40%).
Average rainfall in September
Washam, WY
- Average rainfall in September: 0.94"
The wettest month (with the highest rainfall) is May (2.17").
The driest month (with the least rainfall) is January (0.67").
Average rainfall days in September
Washam, WY
- Average rainfall days in September: 10.5 days
The month with the highest number of rainy days is May (13.2 days).
The month with the least rainy days is November (3 days).
Average snowfall in September
Washam, WY
- Average snowfall in September: 0.67"
The month with the highest snowfall is March (9.57").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Washam, WY
- Average snowfall days in September: 0.9 days
The month with the highest number of snowfall days is February (13.7 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Washam, WY
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in September: 10h and 3min
The months with the most sunshine are July and August (Average sunshine: 11h and 36min).
The months with the least sunshine are January and December (Average sunshine: 6h and 24min).
Average sunshine days in September
Washam, WY
- Average sunshine days in September: 17.7 days
The month with the most sunshine days is November (19.9 days).
The month with the least sunshine days is May (11.5 days).
Average UV index in September
Washam, WY
- Average UV index in September: 4
The months with the highest UV index are June, July and August (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
Washam, WY
- Average cloud cover in September: 15
The month with the most cloud cover is February (Cloud cover 36).
The month with the least cloud cover is September (Cloud cover 15).
Average visibility in September
Washam, WY
- Average visibility in September: 6mi
The months with the highest visibility are January, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is February (5mi).
Washam, Wyoming, USA
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