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
In September, the average high-temperature goes from a moderately hot 76.1°F (24.5°C) in August to a refreshing 66.9°F (19.4°C). Twin Forks's temperature in September declines substantially from daytime highs, settling at a consistent average of 42.3°F (5.7°C) during the nights.Humidity
In September, the average relative humidity is 52%.Rainfall
In Twin Forks, in September, during 9.5 rainfall days, 1.38" (35mm) of precipitation is typically accumulated. In Twin Forks, during the entire year, the rain falls for 110.1 days and collects up to 23.35" (593mm) of precipitation.Snowfall
Months with snowfall are January through June, September through December. September is the first month it typically snows. Throughout September, in the average 1 snowfall days, it receives 1.06" (27mm) of snow. Throughout the year, in Twin Forks, there are 125.3 snowfall days, and 120.47" (3060mm) of snow is accumulated.Daylight
The average length of the day in September is 12h and 29min.On the first day of the month, sunrise is at 6:49 am and sunset at 7:59 pm. On the last day of September, in Twin Forks, sunrise is at 7:22 am and sunset at 7:06 pm MDT.
Sunshine
In Twin Forks, the average sunshine in September is 10.1h.UV index
The average daily maximum UV index in September in Twin Forks is 3. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for average individuals.Note: An average maximum UV index of 3 in September leads to these recommendations:
Be vigilant - Preventing sunburn is recommended. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.
Frequently asked questions
What are the temperatures in Twin Forks in September?
What is the average humidity in September in Twin Forks?
How many days does it rain in September in Twin Forks?
When does it start to snow in Twin Forks?
How many hours of daylight does Twin Forks have in September?
What time are sunrise and sunset in September in Twin Forks?
How long on average sun shines in September in Twin Forks?
What is the UV index reading in September in Twin Forks?
Average temperature in September
Twin Forks, ID
- Average high temperature in September: 66.9°F
The warmest month (with the highest average high temperature) is July (77.2°F).
The month with the lowest average high temperature is December (23.9°F).
- Average low temperature in September: 42.3°F
The month with the highest average low temperature is July (48.7°F).
The coldest month (with the lowest average low temperature) is January (9.1°F).
Average pressure in September
Twin Forks, ID
- Average pressure in September: 29.99"Hg
The month with the highest atmospheric pressure is January (30.27"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Twin Forks, ID
- Average wind speed in September: 5.7mph
The windiest month (with the highest average wind speed) is June (6.3mph).
The calmest months (with the lowest average wind speed) are January and December (4.6mph).
Average humidity in September
Twin Forks, ID
- Average humidity in September: 52%
The month with the highest relative humidity is February (93%).
The month with the lowest relative humidity is August (45%).
Average rainfall in September
Twin Forks, ID
- Average rainfall in September: 1.38"
The wettest month (with the highest rainfall) is February (2.91").
The driest month (with the least rainfall) is July (0.71").
Average rainfall days in September
Twin Forks, ID
- Average rainfall days in September: 9.5 days
The month with the highest number of rainy days is May (16.1 days).
The month with the least rainy days is January (4.5 days).
Average snowfall in September
Twin Forks, ID
- Average snowfall in September: 1.06"
The month with the highest snowfall is January (24.06").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Twin Forks, ID
- Average snowfall days in September: 1 days
The month with the highest number of snowfall days is December (21.8 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Twin Forks, ID
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in September: 10h and 1min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days in September
Twin Forks, ID
- Average sunshine days in September: 17.5 days
The month with the most sunshine days is July (20.6 days).
The month with the least sunshine days is February (7.3 days).
Average UV index in September
Twin Forks, ID
- Average UV index in September: 3
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March and December (UV index 1).
Average cloud cover in September
Twin Forks, ID
- Average cloud cover in September: 18
The month with the most cloud cover is February (Cloud cover 65).
The months with the least cloud cover are July and August (Cloud cover 13).
Average visibility in September
Twin Forks, 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 and February (3mi).
Twin Forks, Idaho, USA
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