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
With the onset of September, Ralston experiences a modest temperature adjustment, with the average high-temperature receding from a warm 81.3°F (27.4°C) in August to a pleasant 72.1°F (22.3°C). Throughout September, an average low-temperature of 51.1°F (10.6°C) is expected in Ralston.Humidity
In September, the average relative humidity is 40%.Rainfall
In Ralston, Wyoming, in September, during 7.1 rainfall days, 0.71" (18mm) of precipitation is typically accumulated. In Ralston, Wyoming, during the entire year, the rain falls for 105.7 days and collects up to 8.19" (208mm) of precipitation.Snowfall
Months with snowfall are January through June, September through December. September is the first month it typically snows in Ralston. Throughout September, in the average 0.2 snowfall days, it receives 0.16" (4mm) of snow. Throughout the year, there are 52.1 snowfall days, and 16.97" (431mm) of snow is accumulated.Daylight
In September, the average length of the day is 12h and 30min.On the first day of the month, sunrise is at 6:38 am and sunset at 7:51 pm. On the last day of September, sunrise is at 7:13 am and sunset at 6:57 pm MDT.
Sunshine
In September, the average sunshine in Ralston is 10.8h.UV index
The average daily maximum UV index in September in Ralston is 4. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for average individuals.Note: The daily high UV index of 4 in September translates into this advice:
Proceed with care. Light skin individuals may be exposed to burns in fewer than 30 minutes. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades. Remember to consider! The UV radiation from the Sun can be intensified nearly twice by the reflection of snow.
Frequently asked questions
What are September temperatures in Ralston?
What is the average humidity in September in Ralston?
How much does it rain in Ralston in September?
When does it start to snow in Ralston?
How many hours of daylight does Ralston have in September?
What time are sunrise and sunset in September in Ralston?
How long on average sun shines in September in Ralston?
How high is the UV index in September in Ralston?
Average temperature in September
Ralston, WY
- Average high temperature in September: 72.1°F
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is December (29.7°F).
- Average low temperature in September: 51.1°F
The month with the highest average low temperature is July (60.4°F).
The coldest month (with the lowest average low temperature) is December (15.6°F).
Average pressure in September
Ralston, WY
- Average pressure in September: 29.97"Hg
The months with the highest atmospheric pressure are January and December (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in September
Ralston, WY
- Average wind speed in September: 6.7mph
The windiest month (with the highest average wind speed) is April (8.3mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).
Average humidity in September
Ralston, WY
- Average humidity in September: 40%
The month with the highest relative humidity is January (76%).
The months with the lowest relative humidity are July and August (37%).
Average rainfall in September
Ralston, WY
- Average rainfall in September: 0.71"
The wettest month (with the highest rainfall) is May (1.5").
The driest month (with the least rainfall) is January (0.31").
Average rainfall days in September
Ralston, WY
- Average rainfall days in September: 7.1 days
The month with the highest number of rainy days is May (15.4 days).
The month with the least rainy days is December (4.9 days).
Average snowfall in September
Ralston, WY
- Average snowfall in September: 0.16"
The month with the highest snowfall is February (3.9").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Ralston, WY
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is February (11 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Ralston, 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 month with the most sunshine is July (Average sunshine: 12h and 6min).
The months with the least sunshine are January, February and December (Average sunshine: 6h and 42min).
Average sunshine days in September
Ralston, WY
- Average sunshine days in September: 17.9 days
The month with the most sunshine days is December (21.7 days).
The month with the least sunshine days is May (11.3 days).
Average UV index in September
Ralston, WY
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in September
Ralston, WY
- Average cloud cover in September: 15
The month with the most cloud cover is February (Cloud cover 32).
The month with the least cloud cover is July (Cloud cover 13).
Average visibility in September
Ralston, 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).
Ralston, Wyoming, USA
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