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
During the transition into September, Elk River observes a decrease in the average high-temperature, falling from a warm 83.5°F (28.6°C) in August to an agreeable 72.9°F (22.7°C). During September, Elk River detects a significant contrast from its daytime temperatures, with nights averaging at a chilly 46.4°F (8°C).Humidity
In Elk River, the average relative humidity in September is 55%.Rainfall
In Elk River, in September, it is raining for 7.5 days, with typically 0.63" (16mm) of accumulated precipitation. Throughout the year, there are 147.4 rainfall days, and 14.72" (374mm) of precipitation is accumulated.Snowfall
May through September are months without snowfall in Elk River.Daylight
In September, the average length of the day is 12h and 32min.On the first day of the month, sunrise is at 6:05 am and sunset at 7:23 pm. On the last day of September, sunrise is at 6:43 am and sunset at 6:25 pm PDT.
Sunshine
The average sunshine in September is 9.9h.UV index
In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for the ordinary person.Note: The UV index of 4 during September translates into the following guidance:
Take precautions. Light skin individuals may get burned in less than 30 minutes. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. Guard yourself! Snow reflection can almost double the UV radiation from the Sun.
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?
When it does not snow?
Does it snow in September?
What is the average length of the day in September?
When 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
Elk River, ID
- Average high temperature in September: 72.9°F
The warmest month (with the highest average high temperature) is August (83.5°F).
The month with the lowest average high temperature is December (33.1°F).
- Average low temperature in September: 46.4°F
The month with the highest average low temperature is August (51.3°F).
The coldest month (with the lowest average low temperature) is December (21.9°F).
Average pressure in September
Elk River, ID
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.2"Hg).
The months with the lowest atmospheric pressure are June and August (29.93"Hg).
Average wind speed in September
Elk River, ID
- Average wind speed in September: 3.6mph
The windiest month (with the highest average wind speed) is April (4.5mph).
The calmest month (with the lowest average wind speed) is September (3.6mph).
Average humidity in September
Elk River, ID
- Average humidity in September: 55%
The month with the highest relative humidity is January (90%).
The month with the lowest relative humidity is August (48%).
Average rainfall in September
Elk River, ID
- Average rainfall in September: 0.63"
The wettest month (with the highest rainfall) is January (1.69").
The driest month (with the least rainfall) is August (0.35").
Average rainfall days in September
Elk River, ID
- Average rainfall days in September: 7.5 days
The month with the highest number of rainy days is March (17.7 days).
The month with the least rainy days is August (4.9 days).
Average snowfall in September
Elk River, ID
- Average snowfall in September: 0"
The month with the highest snowfall is December (3.74").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Elk River, ID
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is December (9.7 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Elk River, ID
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in September: 9h and 5min
The month with the most sunshine is August (Average sunshine: 12h and 0min).
The months with the least sunshine are January and December (Average sunshine: 4h and 6min).
Average sunshine days in September
Elk River, ID
- Average sunshine days in September: 20.1 days
The month with the most sunshine days is August (23.5 days).
The month with the least sunshine days is February (9.1 days).
Average UV index in September
Elk River, ID
- 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, November and December (UV index 1).
Average cloud cover in September
Elk River, ID
- Average cloud cover in September: 21
The month with the most cloud cover is February (Cloud cover 60).
The months with the least cloud cover are July and August (Cloud cover 13).
Average visibility in September
Elk River, ID
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February and December (4mi).
Elk River, Idaho, USA
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