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
Oldtown's September weather comes with a decrease in average high-temperatures, moving from a warm 82°F (27.8°C) in August to a pleasant 70.7°F (21.5°C). Marked by a significant temperature drop from daytime highs, the average nighttime temperature in Oldtown, Idaho, lowers to a chilly 43.7°F (6.5°C) throughout September.Humidity
In September, the average relative humidity is 59%.Rainfall
In Oldtown, in September, it is raining for 8.7 days, with typically 0.91" (23mm) of accumulated precipitation. Throughout the year, there are 125.5 rainfall days, and 19.92" (506mm) 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 0.43" (11mm) of snow. In Oldtown, during the entire year, snow falls for 81.4 days and aggregates up to 58.11" (1476mm) of snow.Daylight
In Oldtown, the average length of the day in September is 12h and 34min.On the first day of the month, sunrise is at 6:07 am and sunset at 7:28 pm. On the last day of September, sunrise is at 6:47 am and sunset at 6:28 pm PDT.
Sunshine
In Oldtown, the average sunshine in September is 10.1h.UV index
The average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for the ordinary person.Note: The daily high UV index of 3 in September translates into this advice:
Put precautions into practice - Protective measures against sun-induced damage are advised. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Oldtown in September?
What is the average humidity in September?
How many days does it rain in September?
When does it start to snow?
What is the average length of the day in September?
When are sunrise and sunset in September?
How long on average sun shines in September in Oldtown?
What is the UV index intensity in September?
Average temperature in September
Oldtown, ID
- Average high temperature in September: 70.7°F
The warmest month (with the highest average high temperature) is August (82°F).
The month with the lowest average high temperature is December (29.7°F).
- Average low temperature in September: 43.7°F
The month with the highest average low temperature is August (50.7°F).
The coldest month (with the lowest average low temperature) is January (19.2°F).
Average pressure in September
Oldtown, ID
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.2"Hg).
The months with the lowest atmospheric pressure are June and August (29.91"Hg).
Average wind speed in September
Oldtown, ID
- Average wind speed in September: 4mph
The windiest month (with the highest average wind speed) is April (4.7mph).
The calmest month (with the lowest average wind speed) is December (3.4mph).
Average humidity in September
Oldtown, ID
- Average humidity in September: 59%
The month with the highest relative humidity is January (94%).
The month with the lowest relative humidity is August (49%).
Average rainfall in September
Oldtown, ID
- Average rainfall in September: 0.91"
The wettest month (with the highest rainfall) is January (2.64").
The driest month (with the least rainfall) is August (0.43").
Average rainfall days in September
Oldtown, ID
- Average rainfall days in September: 8.7 days
The month with the highest number of rainy days is April (16.7 days).
The month with the least rainy days is August (5.8 days).
Average snowfall in September
Oldtown, ID
- Average snowfall in September: 0.43"
The month with the highest snowfall is January (16.26").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Oldtown, ID
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is December (17.8 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Oldtown, ID
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 24min).
- Average sunshine in September: 10h and 1min
The month with the most sunshine is August (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 12min).
Average sunshine days in September
Oldtown, ID
- Average sunshine days in September: 19.7 days
The month with the most sunshine days is July (23.1 days).
The month with the least sunshine days is March (9.2 days).
Average UV index in September
Oldtown, ID
- Average UV index in September: 3
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are February, November and December (UV index 1).
Average cloud cover in September
Oldtown, ID
- Average cloud cover in September: 23
The month with the most cloud cover is January (Cloud cover 66).
The months with the least cloud cover are July and August (Cloud cover 14).
Average visibility in September
Oldtown, ID
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, August and September (6mi).
The months with the lowest visibility are January, February and December (3mi).
Oldtown, Idaho, USA
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