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 arrival of September indicates a decrease in the average high-temperature, moving from an agreeable 70.7°F (21.5°C) in August to an enjoyable 61.2°F (16.2°C). In September, the nighttime temperature plummets remarkably from the daily apex to a steady average of 37.2°F (2.9°C).Humidity
The average relative humidity in September in Three River Junction is 57%.Rainfall
In Three River Junction, in September, during 8.5 rainfall days, 1.57" (40mm) of precipitation is typically accumulated. Throughout the year, there are 94.6 rainfall days, and 24.41" (620mm) of precipitation is accumulated.Snowfall
January through December are months with snowfall. In Three River Junction, in September, during 3.9 snowfall days, 4.49" (114mm) of snow is typically accumulated. Throughout the year, in Three River Junction, Wyoming, there are 176.8 snowfall days, and 135.55" (3443mm) of snow is accumulated.Daylight
The average length of the day in September is 12h and 30min.On the first day of September, sunrise is at 6:47 am and sunset at 7:59 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 7:05 pm MDT.
Sunshine
In Three River Junction, the average sunshine in September is 9.9h.UV index
The average daily maximum UV index in September is 2. A UV Index reading of 2, and below, represents a minimal health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: The maximum daily UV index of 2 in September interprets into the following recommendations:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. Enhance your sun protection with tightly woven, yet airy clothing. 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 are September temperatures?
What is the average humidity in September?
How many days does it rain in September?
How many days does it snow in September?
How many hours of daylight does Three River Junction have in September?
What time are sunrise and sunset in September?
How long on average sun shines in September?
What is the UV index intensity in September?
Average temperature in September
Three River Junction, WY
- Average high temperature in September: 61.2°F
The warmest month (with the highest average high temperature) is July (72.1°F).
The month with the lowest average high temperature is December (19.4°F).
- Average low temperature in September: 37.2°F
The month with the highest average low temperature is July (43.7°F).
The coldest month (with the lowest average low temperature) is December (3.9°F).
Average pressure in September
Three River Junction, WY
- Average pressure in September: 29.99"Hg
The month with the highest atmospheric pressure is January (30.24"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Three River Junction, WY
- Average wind speed in September: 6.6mph
The windiest months (with the highest average wind speed) are February and June (7.4mph).
The calmest months (with the lowest average wind speed) are May and August (6.3mph).
Average humidity in September
Three River Junction, WY
- Average humidity in September: 57%
The month with the highest relative humidity is February (94%).
The months with the lowest relative humidity are July and August (50%).
Average rainfall in September
Three River Junction, WY
- Average rainfall in September: 1.57"
The wettest month (with the highest rainfall) is May (3.03").
The driest month (with the least rainfall) is July (0.94").
Average rainfall days in September
Three River Junction, WY
- Average rainfall days in September: 8.5 days
The month with the highest number of rainy days is May (15.5 days).
The month with the least rainy days is January (2.2 days).
Average snowfall in September
Three River Junction, WY
- Average snowfall in September: 4.49"
The month with the highest snowfall is April (19.69").
The months with the least snowfall are July and August (0.08").
Average snowfall days in September
Three River Junction, WY
- Average snowfall days in September: 3.9 days
The month with the highest number of snowfall days is March (25.3 days).
The month with the least snowfall days is July (0.3 days).
Average daylight in September /
Average sunshine in September
Three River Junction, 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: 9h and 5min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The months with the least sunshine are February and December (Average sunshine: 3h and 18min).
Average sunshine days in September
Three River Junction, WY
- Average sunshine days in September: 16 days
The month with the most sunshine days is September (16 days).
The month with the least sunshine days is April (4.5 days).
Average UV index in September
Three River Junction, WY
- Average UV index in September: 2
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March, October, November and December (UV index 1).
Average cloud cover in September
Three River Junction, WY
- Average cloud cover in September: 22
The month with the most cloud cover is February (Cloud cover 74).
The month with the least cloud cover is July (Cloud cover 15).
Average visibility in September
Three River Junction, WY
- Average visibility in September: 6mi
The months with the highest visibility are June, July, August and September (6mi).
The months with the lowest visibility are January, February and December (3mi).
Three River Junction, Wyoming, USA
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