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
Twin Falls's September weather features a mild decline in high-temperatures, reducing from a tropical 88°F (31.1°C) in August to a moderately hot 77.5°F (25.3°C). Twin Falls experiences a dramatic descent in temperature during September, with the average nighttime reading settling at a fresh 54.5°F (12.5°C).Humidity
The average relative humidity in September is 34%.Rainfall
In Twin Falls, in September, during 6.4 rainfall days, 0.35" (9mm) of precipitation is typically accumulated. In Twin Falls, during the entire year, the rain falls for 91.4 days and collects up to 9.29" (236mm) of precipitation.Snowfall
May through September are months without snowfall.Daylight
The average length of the day in September is 12h and 28min.On the first day of the month, sunrise is at 7:03 am and sunset at 8:11 pm. On the last day of September, sunrise is at 7:34 am and sunset at 7:20 pm MDT.
Sunshine
In September, the average sunshine is 9.5h.UV index
In Twin Falls, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the ordinary person.Note: The maximum daily UV index, 5 in September, converts into the following recommendations:
Proceed with care. Light skin individuals may be exposed to burns in fewer than 30 minutes. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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?
How many hours of daylight does Twin Falls have in September?
What time are sunrise and sunset in September in Twin Falls?
How long on average sun shines in September?
How high is the UV index in September?
Average temperature in September
Twin Falls, ID
- Average high temperature in September: 77.5°F
The warmest month (with the highest average high temperature) is July (89.6°F).
The month with the lowest average high temperature is December (34°F).
- Average low temperature in September: 54.5°F
The month with the highest average low temperature is July (62.1°F).
The coldest month (with the lowest average low temperature) is December (23°F).
Average pressure in September
Twin Falls, ID
- Average pressure in September: 29.93"Hg
The month with the highest atmospheric pressure is January (30.28"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in September
Twin Falls, ID
- Average wind speed in September: 7.5mph
The windiest month (with the highest average wind speed) is April (10mph).
The calmest month (with the lowest average wind speed) is August (7.3mph).
Average humidity in September
Twin Falls, ID
- Average humidity in September: 34%
The month with the highest relative humidity is January (78%).
The month with the lowest relative humidity is July (28%).
Average rainfall in September
Twin Falls, ID
- Average rainfall in September: 0.35"
The wettest month (with the highest rainfall) is December (1.3").
The driest months (with the least rainfall) are July and August (0.24").
Average rainfall days in September
Twin Falls, ID
- Average rainfall days in September: 6.4 days
The month with the highest number of rainy days is March (12.1 days).
The month with the least rainy days is August (4.4 days).
Average snowfall in September
Twin Falls, ID
- Average snowfall in September: 0"
The month with the highest snowfall is January (5.04").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Twin Falls, ID
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (9.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Twin Falls, ID
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in September: 9h and 3min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).
Average sunshine days in September
Twin Falls, ID
- Average sunshine days in September: 22.3 days
The month with the most sunshine days is August (23.3 days).
The month with the least sunshine days is March (14.7 days).
Average UV index in September
Twin Falls, ID
- Average UV index in September: 5
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Twin Falls, ID
- Average cloud cover in September: 14
The month with the most cloud cover is December (Cloud cover 40).
The months with the least cloud cover are July and August (Cloud cover 10).
Average visibility in September
Twin Falls, ID
- 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).
Twin Falls, Idaho, USA
Weather forecast for your location
2. Allow the app to use your location