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
The shift to September brings a decrease in the average high-temperature, falling from a warm 82.6°F (28.1°C) in August to an agreeable 72.7°F (22.6°C). In the month of September, Grangeville witnesses a marked temperature drop at night, averaging a low of 47.3°F (8.5°C).Humidity
In September, the average relative humidity is 53%.Rainfall
In Grangeville, Idaho, in September, it is raining for 7.8 days, with typically 0.94" (24mm) of accumulated precipitation. In Grangeville, during the entire year, the rain falls for 146.2 days and collects up to 23.35" (593mm) of precipitation.Snowfall
January through May, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.3 snowfall days, it receives 0.75" (19mm) of snow. In Grangeville, during the entire year, snow falls for 80.3 days and aggregates up to 60.47" (1536mm) of snow.Daylight
In September, the average length of the day is 12h and 31min.On the first day of September, sunrise is at 6:06 am and sunset at 7:22 pm. On the last day of the month, sunrise is at 6:42 am and sunset at 6:25 pm PDT.
Sunshine
The average sunshine in September is 10h.UV index
In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: In September, the maximum UV index of 4 translates into these guidelines:
Exercise caution. Those with pale skin may experience burns in less than half an hour. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Stay alert! Snow's reflective properties can almost double the UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Grangeville in September?
What is the average humidity in September?
How much does it rain in September?
When does it start to snow?
What is the average length of the day in September in Grangeville?
When is the sunrise / sunset in September?
How many hours of sunshine does Grangeville have in September?
What is the UV index intensity in September?
Average temperature in September
Grangeville, ID
- Average high temperature in September: 72.7°F
The warmest month (with the highest average high temperature) is August (82.6°F).
The month with the lowest average high temperature is December (33.6°F).
- Average low temperature in September: 47.3°F
The month with the highest average low temperature is August (53.2°F).
The coldest month (with the lowest average low temperature) is December (21.7°F).
Average pressure in September
Grangeville, ID
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.21"Hg).
The months with the lowest atmospheric pressure are June and August (29.94"Hg).
Average wind speed in September
Grangeville, ID
- Average wind speed in September: 3.9mph
The windiest months (with the highest average wind speed) are January and November (4.9mph).
The calmest month (with the lowest average wind speed) is August (3.8mph).
Average humidity in September
Grangeville, ID
- Average humidity in September: 53%
The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is August (47%).
Average rainfall in September
Grangeville, ID
- Average rainfall in September: 0.94"
The wettest month (with the highest rainfall) is April (2.91").
The driest month (with the least rainfall) is July (0.59").
Average rainfall days in September
Grangeville, ID
- Average rainfall days in September: 7.8 days
The month with the highest number of rainy days is April (19.3 days).
The month with the least rainy days is August (6.8 days).
Average snowfall in September
Grangeville, ID
- Average snowfall in September: 0.75"
The month with the highest snowfall is February (12.95").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Grangeville, ID
- Average snowfall days in September: 0.3 days
The month with the highest number of snowfall days is December (16.9 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Grangeville, ID
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in September: 10h and 0min
The month with the most sunshine is August (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 4h and 48min).
Average sunshine days in September
Grangeville, ID
- Average sunshine days in September: 20 days
The month with the most sunshine days is August (22.2 days).
The month with the least sunshine days is March (7.5 days).
Average UV index in September
Grangeville, ID
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is February (UV index 1).
Average cloud cover in September
Grangeville, ID
- Average cloud cover in September: 21
The month with the most cloud cover is February (Cloud cover 53).
The month with the least cloud cover is August (Cloud cover 13).
Average visibility in September
Grangeville, ID
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (4mi).
Grangeville, Idaho, USA
Weather forecast for your location
2. Allow the app to use your location