September weather forecastPayette, ID
September
Weather in September
With the arrival of September, there's a transition from summer to autumn, seen in Payette's weather. The noticeably cooler temperatures, the onset of the fall equinox, and the changing foliage encapsulate the essence of the season. Interestingly, despite the decrease in temperature, there is minimal fluctuation in rainfall and daylight hours from August to September. The gradually decreasing temperatures signal the gradual onset of the colder months.Temperature
Payette's progression into September involves a drop in the average high-temperature, receding from a hot 90°F (32.2°C) in August to a warm 79.3°F (26.3°C). Significant dips from daytime highs mark the September nights, with a consistent average temperature of 54.1°F (12.3°C).Humidity
In Payette, the average relative humidity in September is 37%.Rainfall
In Payette, in September, during 4.8 rainfall days, 0.31" (8mm) of precipitation is typically accumulated. Throughout the year, there are 100.3 rainfall days, and 10.16" (258mm) of precipitation is accumulated.Snowfall
May through October are months without snowfall.Daylight
The average length of the day in September is 12h and 29min.On the first day of September, sunrise is at 7:11 am and sunset at 8:23 pm. On the last day of the month, sunrise is at 7:45 am and sunset at 7:29 pm MDT.
Sunshine
In Payette, the average sunshine in September is 9.5h.UV index
In Payette, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for the average person.Note: The UV index of 5 during September translates into the following guidance:
Act with care - The need to guard against sun damage is communicated. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Payette, ID
- Average high temperature in September: 79.3°F
The warmest month (with the highest average high temperature) is July (91.2°F).
The month with the lowest average high temperature is December (35.1°F).
- Average low temperature in September: 54.1°F
The month with the highest average low temperature is August (61°F).
The coldest month (with the lowest average low temperature) is December (22.8°F).
Average pressure in September
Payette, ID
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.24"Hg).
The months with the lowest atmospheric pressure are June and August (29.92"Hg).
Average wind speed in September
Payette, ID
- Average wind speed in September: 4.8mph
The windiest month (with the highest average wind speed) is April (6.2mph).
The calmest month (with the lowest average wind speed) is January (3.6mph).
Average humidity in September
Payette, ID
- Average humidity in September: 37%
The month with the highest relative humidity is January (84%).
The months with the lowest relative humidity are July and August (31%).
Average rainfall in September
Payette, ID
- Average rainfall in September: 0.31"
The wettest month (with the highest rainfall) is December (1.69").
The driest month (with the least rainfall) is July (0.12").
Average rainfall days in September
Payette, ID
- Average rainfall days in September: 4.8 days
The month with the highest number of rainy days is March (15.5 days).
The month with the least rainy days is August (3 days).
Average snowfall in September
Payette, ID
- Average snowfall in September: 0"
The month with the highest snowfall is December (6.46").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Payette, ID
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (9.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Payette, 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: 8h and 54min).
- Average sunshine in September: 9h and 30min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 12min).
Average sunshine days in September
Payette, ID
- Average sunshine days in September: 24 days
The month with the most sunshine days is July (25.8 days).
The month with the least sunshine days is March (13.2 days).
Average UV index in September
Payette, ID
- Average UV index in September: 5
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Payette, ID
- Average cloud cover in September: 14
The months with the most cloud cover are January and December (Cloud cover 43).
The month with the least cloud cover is July (Cloud cover 7).
Average visibility in September
Payette, ID
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and December (5mi).
