September weather forecastMiddleton, ID
September
Weather in September
The arrival of September marks a shift from the peak summer conditions in August. The temperature decrease becomes evident, signaling the onset of an inviting fall season. Though rainfall records an uptick from the summer months, its value remains much lower than the annual average. The decreasing daylight-hours provide proof of the summer's exit. Midway through September, Middleton starts to experience the refreshing touch of the fall season.Temperature
The start of September comes with a reduction in the average high-temperature, receding from a tropical 89.6°F (32°C) in August to a warm 78.3°F (25.7°C). Despite the high peak temperatures, Middleton witnesses an average nighttime cooling to a cool 55°F (12.8°C) in September.Humidity
In Middleton, the average relative humidity in September is 36%.Rainfall
In Middleton, in September, it is raining for 5.3 days, with typically 0.28" (7mm) of accumulated precipitation. Throughout the year, there are 94.4 rainfall days, and 9.65" (245mm) of precipitation is accumulated.Snowfall
May through October are months without snowfall.Daylight
In September, the average length of the day is 12h and 29min.On the first day of the month, sunrise is at 7:11 am and sunset at 8:21 pm. On the last day of September, sunrise is at 7:43 am and sunset at 7:28 pm MDT.
Sunshine
In September, the average sunshine is 9.6h.UV index
In September, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for the average person.Note: The daily high UV index of 5 during September translates into the following recommendations:
Be vigilant - Suggestions to stave off sun damage are provided. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Middleton, ID
- Average high temperature in September: 78.3°F
The warmest month (with the highest average high temperature) is July (91°F).
The month with the lowest average high temperature is December (35.8°F).
- Average low temperature in September: 55°F
The month with the highest average low temperature is August (62.2°F).
The coldest month (with the lowest average low temperature) is December (24.3°F).
Average pressure in September
Middleton, ID
- Average pressure in September: 29.95"Hg
The month with the highest atmospheric pressure is January (30.24"Hg).
The months with the lowest atmospheric pressure are June and August (29.91"Hg).
Average wind speed in September
Middleton, ID
- Average wind speed in September: 5.1mph
The windiest month (with the highest average wind speed) is April (6.9mph).
The calmest month (with the lowest average wind speed) is January (4.7mph).
Average humidity in September
Middleton, ID
- Average humidity in September: 36%
The month with the highest relative humidity is January (80%).
The months with the lowest relative humidity are July and August (30%).
Average rainfall in September
Middleton, ID
- Average rainfall in September: 0.28"
The wettest month (with the highest rainfall) is March (1.57").
The driest month (with the least rainfall) is July (0.08").
Average rainfall days in September
Middleton, ID
- Average rainfall days in September: 5.3 days
The month with the highest number of rainy days is March (15 days).
The month with the least rainy days is July (2.5 days).
Average snowfall in September
Middleton, ID
- Average snowfall in September: 0"
The month with the highest snowfall is December (3.7").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Middleton, ID
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (6.9 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
Middleton, 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: 9h and 36min
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 36min).
Average sunshine days in September
Middleton, ID
- Average sunshine days in September: 23.5 days
The month with the most sunshine days is July (26.5 days).
The month with the least sunshine days is March (14.6 days).
Average UV index in September
Middleton, 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
Middleton, ID
- Average cloud cover in September: 13
The month with the most cloud cover is December (Cloud cover 40).
The month with the least cloud cover is July (Cloud cover 7).
Average visibility in September
Middleton, ID
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
