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 transition into September indicates a reduction in the average high-temperature, down to a still moderately hot 73.4°F (23°C) from August's 83.7°F (28.7°C). Despite high daytime temperatures, the average temperature lowers to a cool 51.4°F (10.8°C) during September nights.Humidity
In September, the average relative humidity is 48%.Rainfall
In Viola, in September, it is raining for 8.1 days, with typically 0.63" (16mm) of accumulated precipitation. Throughout the year, in Viola, there are 143.2 rainfall days, and 20.51" (521mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, September through December. September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 0.28" (7mm) of snow. In Viola, during the entire year, snow falls for 60.2 days and aggregates up to 47.24" (1200mm) of snow.Daylight
In Viola, the average length of the day in September is 12h and 32min.On the first day of September, sunrise is at 6:08 am and sunset at 7:26 pm. On the last day of the month, sunrise is at 6:46 am and sunset at 6:28 pm PDT.
Sunshine
In Viola, the average sunshine in September is 10.3h.UV index
In Viola, Idaho, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for the average person.Note: In September, the maximum UV index of 4 suggests this advice:
Take precautions - Protection against skin and eye damage is obliged. The solar radiation around mid-day is intense; avoid the Sun and stay safe. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Heads up! The UV radiation from the Sun can almost be doubled by snow reflection.
Frequently asked questions
What are September temperatures in Viola?
What is the average humidity in September in Viola?
How much does it rain in Viola in September?
When does it start to snow in Viola?
What is the average length of the day in September in Viola?
What time are sunrise and sunset in September in Viola?
How long on average sun shines in September in Viola?
What is the UV index intensity in September in Viola?
Average temperature in September
Viola, ID
- Average high temperature in September: 73.4°F
The warmest month (with the highest average high temperature) is August (83.7°F).
The month with the lowest average high temperature is December (34°F).
- Average low temperature in September: 51.4°F
The month with the highest average low temperature is August (58.1°F).
The coldest month (with the lowest average low temperature) is December (24.1°F).
Average pressure in September
Viola, ID
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.2"Hg).
The month with the lowest atmospheric pressure is August (29.91"Hg).
Average wind speed in September
Viola, ID
- Average wind speed in September: 4.8mph
The windiest month (with the highest average wind speed) is April (6.3mph).
The calmest months (with the lowest average wind speed) are July, August and September (4.8mph).
Average humidity in September
Viola, ID
- Average humidity in September: 48%
The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is August (40%).
Average rainfall in September
Viola, ID
- Average rainfall in September: 0.63"
The wettest month (with the highest rainfall) is December (2.68").
The driest months (with the least rainfall) are July and August (0.47").
Average rainfall days in September
Viola, ID
- Average rainfall days in September: 8.1 days
The month with the highest number of rainy days is April (18.1 days).
The months with the least rainy days are July and August (5.9 days).
Average snowfall in September
Viola, ID
- Average snowfall in September: 0.28"
The month with the highest snowfall is January (12.56").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Viola, ID
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is December (14.1 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Viola, 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: 10h and 2min
The month with the most sunshine is August (Average sunshine: 12h and 0min).
The months with the least sunshine are January, February and December (Average sunshine: 4h and 30min).
Average sunshine days in September
Viola, ID
- Average sunshine days in September: 20.1 days
The month with the most sunshine days is July (23.3 days).
The month with the least sunshine days is February (9.2 days).
Average UV index in September
Viola, ID
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is February (UV index 1).
Average cloud cover in September
Viola, ID
- Average cloud cover in September: 19
The month with the most cloud cover is February (Cloud cover 54).
The months with the least cloud cover are July and August (Cloud cover 12).
Average visibility in September
Viola, ID
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and December (4mi).
Viola, Idaho, USA
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