September weather forecastBasalt, ID
September
Weather in September
September, the first month of the autumn in Basalt, is still a pleasant month, with an average temperature fluctuating between 72.9°F (22.7°C) and 49.3°F (9.6°C).Temperature
As September arrives, Basalt's weather displays a decrease in high-temperatures, transitioning from August's moderately hot 83.3°F (28.5°C) to an agreeable 72.9°F (22.7°C). During September nights, Basalt documents a marked contrast from daily highs, with an average temperature of 49.3°F (9.6°C).Humidity
In September, the average relative humidity in Basalt, Idaho, is 41%.Rainfall
In Basalt, Idaho, in September, it is raining for 10.1 days, with typically 1.06" (27mm) of accumulated precipitation. In Basalt, during the entire year, the rain falls for 124.6 days and collects up to 12.24" (311mm) of precipitation.Snowfall
January through May, September through December are months with snowfall in Basalt. September is the first month it typically snows. Throughout September, in the average 0.1 snowfall days, it receives 0.2" (5mm) of snow. Throughout the year, there are 75.1 snowfall days, and 30.59" (777mm) of snow is accumulated.Daylight
In September, the average length of the day in Basalt is 12h and 29min.On the first day of the month, sunrise is at 6:53 am and sunset at 8:03 pm. On the last day of September, sunrise is at 7:25 am and sunset at 7:10 pm MDT.
Sunshine
In September, the average sunshine in Basalt, Idaho, is 9.9h.UV index
In Basalt, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: An average maximum UV index of 4 in September leads to these recommendations:
Take necessary precautions - Defending against sun damage is advocated. Minimize direct exposure to the Sun during midday when its radiation is at its peak. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Take heed! The reflection of snow can intensify the Sun's UV radiation nearly double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Basalt, ID
- Average high temperature in September: 72.9°F
The warmest month (with the highest average high temperature) is July (85.3°F).
The month with the lowest average high temperature is December (27.9°F).
- Average low temperature in September: 49.3°F
The month with the highest average low temperature is August (55°F).
The coldest month (with the lowest average low temperature) is January (14.7°F).
Average pressure in September
Basalt, ID
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.3"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Basalt, ID
- Average wind speed in September: 7.5mph
The windiest month (with the highest average wind speed) is April (8.9mph).
The calmest month (with the lowest average wind speed) is January (6mph).
Average humidity in September
Basalt, ID
- Average humidity in September: 41%
The month with the highest relative humidity is January (90%).
The months with the lowest relative humidity are July and August (36%).
Average rainfall in September
Basalt, ID
- Average rainfall in September: 1.06"
The wettest month (with the highest rainfall) is May (1.57").
The driest month (with the least rainfall) is July (0.51").
Average rainfall days in September
Basalt, ID
- Average rainfall days in September: 10.1 days
The month with the highest number of rainy days is May (15.9 days).
The month with the least rainy days is January (6.1 days).
Average snowfall in September
Basalt, ID
- Average snowfall in September: 0.2"
The month with the highest snowfall is January (7.44").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Basalt, ID
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is December (16.7 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Basalt, ID
- Average daylight in September: 12h and 30min
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 0min).
- Average sunshine in September: 9h and 54min
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 48min).
Average sunshine days in September
Basalt, ID
- Average sunshine days in September: 17.3 days
The month with the most sunshine days is October (18.9 days).
The month with the least sunshine days is March (10 days).
Average UV index in September
Basalt, 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
Basalt, ID
- Average cloud cover in September: 16
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 11).
Average visibility in September
Basalt, 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 February (4mi).
