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 move into September indicates a reduction in the average high-temperature, down from August's 84.4°F (29.1°C) to a still warm 73.6°F (23.1°C). September in Ammon, marked by an average low-temperature of 49.5°F (9.7°C), indicates a large temperature drop from the daytime peak.Humidity
In September, the average relative humidity is 41%.Rainfall
The months with the most rainfall are May and September, with an average 0.83" (21mm) of precipitation.Snowfall
January through May, September through December are months with snowfall. September is the first month it typically snows in Ammon. Throughout September, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow. Throughout the year, there are 54.4 snowfall days, and 16.89" (429mm) of snow is accumulated.Daylight
In September, the average length of the day 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, in Ammon, sunrise is at 7:25 am and sunset at 7:10 pm MDT.
Sunshine
In Ammon, the average sunshine in September is 10h.UV index
In Ammon, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: In September, an average UV index of 4 transforms into the following instructions:
Take precautions - Protection against sun damage is advised. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Note well! The intensity of the Sun's UV rays can be nearly doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September in Ammon?
What is the average humidity in September in Ammon?
What is the rainiest month in Ammon?
How much does it rain in Ammon in September?
When does it start to snow in Ammon?
How many hours of daylight does Ammon have in September?
What time are sunrise and sunset in September in Ammon?
How long on average sun shines in September in Ammon?
What is the UV index intensity in September in Ammon?
Average temperature in September
Ammon, ID
- Average high temperature in September: 73.6°F
The warmest month (with the highest average high temperature) is July (86.2°F).
The month with the lowest average high temperature is December (27.9°F).
- Average low temperature in September: 49.5°F
The month with the highest average low temperature is August (54.3°F).
The coldest month (with the lowest average low temperature) is January (14.2°F).
Average pressure in September
Ammon, ID
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.3"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Ammon, ID
- Average wind speed in September: 7.6mph
The windiest month (with the highest average wind speed) is April (9mph).
The calmest month (with the lowest average wind speed) is January (5.8mph).
Average humidity in September
Ammon, ID
- Average humidity in September: 41%
The month with the highest relative humidity is January (90%).
The month with the lowest relative humidity is August (35%).
Average rainfall in September
Ammon, ID
- Average rainfall in September: 0.83"
The wettest months (with the highest rainfall) are May and September (0.83").
The driest month (with the least rainfall) is July (0.35").
Average rainfall days in September
Ammon, ID
- Average rainfall days in September: 8.1 days
The month with the highest number of rainy days is May (10.7 days).
The month with the least rainy days is January (3.7 days).
Average snowfall in September
Ammon, ID
- Average snowfall in September: 0.04"
The month with the highest snowfall is January (3.86").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Ammon, ID
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is December (12.9 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Ammon, ID
- Average daylight in September: 12h and 3min
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: 11h and 48min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).
Average sunshine days in September
Ammon, ID
- Average sunshine days in September: 19.4 days
The month with the most sunshine days is October (22.1 days).
The month with the least sunshine days is February (16.2 days).
Average UV index in September
Ammon, 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, February, March, October, November and December (UV index 2).
Average cloud cover in September
Ammon, ID
- Average cloud cover in September: 16
The months with the most cloud cover are January and February (Cloud cover 51).
The months with the least cloud cover are July and August (Cloud cover 11).
Average visibility in September
Ammon, ID
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and February (4mi).
Ammon, Idaho, USA
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