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
September's arrival comes with a decrease in the average high-temperature, moving from a moderately hot 77°F (25°C) in August to an enjoyable 66.2°F (19°C). The average low-temperature reading in September for Mullan reflects a significant fall from the daytime highs, stabilizing at a cold 40.1°F (4.5°C).Humidity
In Mullan, the average relative humidity in September is 63%.Rainfall
In Mullan, in September, it is raining for 8.5 days, with typically 0.75" (19mm) of accumulated precipitation. Throughout the year, there are 88.5 rainfall days, and 25.12" (638mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through June, September through December. September is the first month it typically snows. Throughout September, in the average 1 snowfall days, it receives 0.43" (11mm) of snow. Throughout the year, there are 133.2 snowfall days, and 146.61" (3724mm) of snow is accumulated.Daylight
In September, the average length of the day is 12h and 32min.On the first day of September, sunrise is at 6:03 am and sunset at 7:22 pm. On the last day of the month, sunrise is at 6:41 am and sunset at 6:23 pm PDT.
Sunshine
In Mullan, the average sunshine in September is 8.9h.UV index
The average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the ordinary person.Note: The maximum UV index of 3 during September leads to these instructions:
Exercise care. People with light skin might get burns in fewer than 30 minutes. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Be attentive! The reflective property of snow can nearly double the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature?
What is the average humidity in September?
How many days does it rain in September?
When does it start snowing?
What is the average length of the day in September?
When are sunrise and sunset in September?
How many hours of sunshine does Mullan have in September?
What is the UV index intensity in September?
Average temperature in September
Mullan, ID
- Average high temperature in September: 66.2°F
The warmest month (with the highest average high temperature) is August (77°F).
The month with the lowest average high temperature is December (27.9°F).
- Average low temperature in September: 40.1°F
The month with the highest average low temperature is August (47.3°F).
The coldest month (with the lowest average low temperature) is December (16.9°F).
Average pressure in September
Mullan, ID
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The months with the lowest atmospheric pressure are June and August (29.93"Hg).
Average wind speed in September
Mullan, ID
- Average wind speed in September: 4.1mph
The windiest month (with the highest average wind speed) is April (4.9mph).
The calmest months (with the lowest average wind speed) are August and September (4.1mph).
Average humidity in September
Mullan, ID
- Average humidity in September: 63%
The month with the highest relative humidity is January (93%).
The months with the lowest relative humidity are July and August (54%).
Average rainfall in September
Mullan, ID
- Average rainfall in September: 0.75"
The wettest month (with the highest rainfall) is January (3.58").
The driest month (with the least rainfall) is July (0.39").
Average rainfall days in September
Mullan, ID
- Average rainfall days in September: 8.5 days
The month with the highest number of rainy days is May (13.3 days).
The months with the least rainy days are January and February (2.8 days).
Average snowfall in September
Mullan, ID
- Average snowfall in September: 0.43"
The month with the highest snowfall is January (29.53").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Mullan, ID
- Average snowfall days in September: 1 days
The month with the highest number of snowfall days is March (22.1 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Mullan, ID
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in September: 8h and 5min
The month with the most sunshine is July (Average sunshine: 11h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).
Average sunshine days in September
Mullan, ID
- Average sunshine days in September: 19.7 days
The month with the most sunshine days is August (23.2 days).
The month with the least sunshine days is March (7.5 days).
Average UV index in September
Mullan, ID
- Average UV index in September: 3
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 1).
Average cloud cover in September
Mullan, ID
- Average cloud cover in September: 26
The month with the most cloud cover is February (Cloud cover 67).
The months with the least cloud cover are July and August (Cloud cover 15).
Average visibility in September
Mullan, ID
- Average visibility in September: 6mi
The months with the highest visibility are June, July, August and September (6mi).
The month with the lowest visibility is January (2mi).
Mullan, Idaho, USA
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