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
Swanlake's September weather shows a moderate shift in high-temperatures, falling from August's warm 82.9°F (28.3°C) to a pleasant 72.5°F (22.5°C). Swanlake documents a striking divergence from daytime highs, with an average nighttime temperature of 46.6°F (8.1°C) in September.Humidity
In September, the average relative humidity is 45%.Rainfall
In Swanlake, in September, during 7.5 rainfall days, 1.14" (29mm) of precipitation is typically accumulated. In Swanlake, during the entire year, the rain falls for 127.4 days and collects up to 18.27" (464mm) of precipitation.Snowfall
January through May, September through December are months with snowfall in Swanlake, Idaho. September is the first month it typically snows. Throughout September, in the average 0.1 snowfall days, it receives 0.35" (9mm) of snow. In Swanlake, during the entire year, snow falls for 83.8 days and aggregates up to 60.12" (1527mm) of snow.Daylight
In September, the average length of the day in Swanlake is 12h and 28min.On the first day of September in Swanlake, sunrise is at 6:54 am and sunset at 8:01 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 7:10 pm MDT.
Sunshine
In Swanlake, the average sunshine in September is 10h.UV index
In September, the average daily maximum UV index in Swanlake is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for the average person.Note: In September, the UV index of 4 transforms into the following advice:
Be vigilant - A duty to shield skin and eyes from injury exists. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Keep in mind! Snow's reflective quality can nearly double the intensity of the Sun's UV radiation.
Frequently asked questions
What is the temperature in September in Swanlake?
What is the average humidity in September in Swanlake?
How many days does it rain in September in Swanlake?
When does it start to snow in Swanlake?
How many hours of daylight does Swanlake have in September?
What time are sunrise and sunset in September in Swanlake?
How many hours of sunshine does Swanlake have in September?
What is the UV index reading in September in Swanlake?
Average temperature in September
Swanlake, ID
- Average high temperature in September: 72.5°F
The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is December (28.8°F).
- Average low temperature in September: 46.6°F
The month with the highest average low temperature is July (53.8°F).
The coldest month (with the lowest average low temperature) is January (13.5°F).
Average pressure in September
Swanlake, ID
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.3"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in September
Swanlake, ID
- Average wind speed in September: 5.4mph
The windiest month (with the highest average wind speed) is April (5.8mph).
The calmest month (with the lowest average wind speed) is January (4.2mph).
Average humidity in September
Swanlake, ID
- Average humidity in September: 45%
The month with the highest relative humidity is January (90%).
The month with the lowest relative humidity is August (38%).
Average rainfall in September
Swanlake, ID
- Average rainfall in September: 1.14"
The wettest month (with the highest rainfall) is February (2.24").
The driest month (with the least rainfall) is July (0.35").
Average rainfall days in September
Swanlake, ID
- Average rainfall days in September: 7.5 days
The month with the highest number of rainy days is April (16.6 days).
The month with the least rainy days is July (5.5 days).
Average snowfall in September
Swanlake, ID
- Average snowfall in September: 0.35"
The month with the highest snowfall is January (16.73").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Swanlake, ID
- Average snowfall days in September: 0.1 days
The months with the highest number of snowfall days are January and February (17.6 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Swanlake, ID
- 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: 10h and 0min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 48min).
Average sunshine days in September
Swanlake, ID
- Average sunshine days in September: 18.8 days
The month with the most sunshine days is July (21.8 days).
The month with the least sunshine days is February (8.3 days).
Average UV index in September
Swanlake, 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 and December (UV index 1).
Average cloud cover in September
Swanlake, ID
- Average cloud cover in September: 15
The month with the most cloud cover is February (Cloud cover 51).
The months with the least cloud cover are July and August (Cloud cover 10).
Average visibility in September
Swanlake, ID
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (4mi).
Swanlake, Idaho, USA
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