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
The onset of September brings a small change in high-temperatures, falling from a warm 80.8°F (27.1°C) in August to a pleasant 71.6°F (22°C). During September, the temperature tends to dip to an average of 50.9°F (10.5°C) at night.Humidity
The average relative humidity in September is 38%.Rainfall
In Jeffrey City, during September, the rain falls for 6 days and regularly aggregates up to 0.35" (9mm) of precipitation. Throughout the year, there are 74.8 rainfall days, and 5.71" (145mm) of precipitation is accumulated.Snowfall
In Jeffrey City, snow does not fall in June through September.Daylight
The average length of the day in September is 12h and 28min.On the first day of the month, sunrise is at 6:37 am and sunset at 7:44 pm. On the last day of September, sunrise is at 7:08 am and sunset at 6:53 pm MDT.
Sunshine
The average sunshine in September is 11h.UV index
In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for the average person.Note: In September, a regular UV index of 4 translates into these guidelines:
Undertake protective steps - Obligation to safeguard skin and eyes from harm is in place. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow?
Does it snow in September?
What is the average length of the day in September?
When is the sunrise / sunset in September?
How many hours of sunshine does Jeffrey City have in September?
What is the UV index intensity in September?
Average temperature in September
Jeffrey City, WY
- Average high temperature in September: 71.6°F
The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is December (27.1°F).
- Average low temperature in September: 50.9°F
The month with the highest average low temperature is July (59.2°F).
The coldest month (with the lowest average low temperature) is January (12.9°F).
Average pressure in September
Jeffrey City, WY
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.2"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in September
Jeffrey City, WY
- Average wind speed in September: 9.6mph
The windiest months (with the highest average wind speed) are April and November (10.9mph).
The calmest month (with the lowest average wind speed) is August (8.3mph).
Average humidity in September
Jeffrey City, WY
- Average humidity in September: 38%
The month with the highest relative humidity is January (82%).
The month with the lowest relative humidity is August (34%).
Average rainfall in September
Jeffrey City, WY
- Average rainfall in September: 0.35"
The wettest month (with the highest rainfall) is April (0.79").
The driest months (with the least rainfall) are July and August (0.24").
Average rainfall days in September
Jeffrey City, WY
- Average rainfall days in September: 6 days
The month with the highest number of rainy days is April (10.3 days).
The month with the least rainy days is February (4.3 days).
Average snowfall in September
Jeffrey City, WY
- Average snowfall in September: 0"
The months with the highest snowfall are March and December (3.15").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Jeffrey City, WY
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (10.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Jeffrey City, WY
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in September: 11h and 0min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is February (Average sunshine: 6h and 12min).
Average sunshine days in September
Jeffrey City, WY
- Average sunshine days in September: 22.1 days
The month with the most sunshine days is September (22.1 days).
The month with the least sunshine days is April (14.5 days).
Average UV index in September
Jeffrey City, WY
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).
Average cloud cover in September
Jeffrey City, WY
- Average cloud cover in September: 13
The month with the most cloud cover is February (Cloud cover 37).
The months with the least cloud cover are August and September (Cloud cover 13).
Average visibility in September
Jeffrey City, 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).
Jeffrey City, Wyoming, USA
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