September weather forecastRigby, ID
September
Weather in September
September is a pivotal month in Rigby when the warm summer weather gradually gives way to the incoming fall. The city experiences a notable decrease in daylight hours and a slight increase in rainfall days. A significant drop in the average high temperatures to 72.9°F (22.7°C) and lows to 47.8°F (8.8°C) marks the beginning of fall. The decrease in temperatures is a distinct departure from the hot August, leading to a transitional September. Foliage begins to show their fall colors as autumnal chills grow prominent towards the end of the month.Temperature
Rigby's September weather comes with a decrease in average high-temperatures, moving from a warm 83.3°F (28.5°C) in August to an agreeable 72.9°F (22.7°C). Rigby anticipates a considerable cooling off from the daytime high to an average minimum temperature of 47.8°F (8.8°C) in September.Humidity
The average relative humidity in September is 42%.Rainfall
In Rigby, in September, during 7.8 rainfall days, 0.83" (21mm) of precipitation is typically accumulated. In Rigby, during the entire year, the rain falls for 112.3 days and collects up to 10.94" (278mm) of precipitation.Snowfall
January through May, September through December are months with snowfall. September is the first month it typically snows in Rigby, Idaho. Throughout September, in the average 0.1 snowfall days, it receives 0.24" (6mm) of snow. In Rigby, Idaho, during the entire year, snow falls for 79 days and aggregates up to 31.54" (801mm) of snow.Daylight
In Rigby, the average length of the day in September is 12h and 29min.On the first day of the month, sunrise is at 6:52 am and sunset at 8:02 pm. On the last day of September, sunrise is at 7:25 am and sunset at 7:09 pm MDT.
Sunshine
In Rigby, the average sunshine in September is 10h.UV index
In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.Note: An average UV index of 4 in September transforms into this advice:
Prioritize safety - Recommendations to avert sunburn are shared. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. Be prepared! The intensity of the Sun's UV radiation can be amplified nearly double due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Rigby, ID
- Average high temperature in September: 72.9°F
The warmest month (with the highest average high temperature) is July (85.1°F).
The month with the lowest average high temperature is December (27.1°F).
- Average low temperature in September: 47.8°F
The month with the highest average low temperature is August (53.8°F).
The coldest month (with the lowest average low temperature) is January (13.8°F).
Average pressure in September
Rigby, ID
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.29"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Rigby, ID
- Average wind speed in September: 6.8mph
The windiest month (with the highest average wind speed) is April (8mph).
The calmest month (with the lowest average wind speed) is January (4.9mph).
Average humidity in September
Rigby, ID
- Average humidity in September: 42%
The month with the highest relative humidity is January (90%).
The month with the lowest relative humidity is August (37%).
Average rainfall in September
Rigby, ID
- Average rainfall in September: 0.83"
The wettest month (with the highest rainfall) is May (1.26").
The driest month (with the least rainfall) is July (0.31").
Average rainfall days in September
Rigby, ID
- Average rainfall days in September: 7.8 days
The month with the highest number of rainy days is April (14.2 days).
The month with the least rainy days is July (5.8 days).
Average snowfall in September
Rigby, ID
- Average snowfall in September: 0.24"
The month with the highest snowfall is January (8.31").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Rigby, ID
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is January (17.3 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Rigby, ID
- Average daylight in September: 12h and 30min
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 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 42min).
Average sunshine days in September
Rigby, ID
- Average sunshine days in September: 19.8 days
The month with the most sunshine days is July (22.3 days).
The month with the least sunshine days is February (9.9 days).
Average UV index in September
Rigby, 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
Rigby, ID
- Average cloud cover in September: 16
The month with the most cloud cover is February (Cloud cover 52).
The months with the least cloud cover are July and August (Cloud cover 11).
Average visibility in September
Rigby, 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).
