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
Mill Iron's weather changes with the onset of September, slightly falling from a warm 81.9°F (27.7°C) in August to an agreeable 72.1°F (22.3°C). During September nights, Mill Iron records an average temperature of 54.1°F (12.3°C).Humidity
In September, the average relative humidity is 48%.Rainfall
In Mill Iron, in September, during 9.5 rainfall days, 1.5" (38mm) of precipitation is typically accumulated. In Mill Iron, during the entire year, the rain falls for 109 days and collects up to 15.12" (384mm) of precipitation.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 0.04" (1mm) of snow. In Mill Iron, during the entire year, snow falls for 62.4 days and aggregates up to 21.97" (558mm) of snow.Daylight
In Mill Iron, the average length of the day in September is 12h and 31min.On the first day of September, sunrise is at 6:18 am and sunset at 7:34 pm. On the last day of the month, sunrise is at 6:54 am and sunset at 6:38 pm MDT.
Sunshine
In September, the average sunshine is 10.2h.UV index
In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the average person.Note: In September, the maximum UV index of 4 translates into these guidelines:
Make use of precautions - Suggestions to resist sunburn are communicated. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Keep in mind! Snow's reflective quality can nearly double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature 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?
What time are sunrise and sunset in September?
How many hours of sunshine does Mill Iron have in September?
How high is the UV index in September?
Average temperature in September
Mill Iron, MT
- Average high temperature in September: 72.1°F
The warmest month (with the highest average high temperature) is July (84°F).
The month with the lowest average high temperature is January (26.1°F).
- Average low temperature in September: 54.1°F
The month with the highest average low temperature is July (63.3°F).
The coldest month (with the lowest average low temperature) is January (13.3°F).
Average pressure in September
Mill Iron, MT
- Average pressure in September: 29.92"Hg
The months with the highest atmospheric pressure are January and February (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in September
Mill Iron, MT
- Average wind speed in September: 10.9mph
The windiest months (with the highest average wind speed) are April and October (11.9mph).
The calmest months (with the lowest average wind speed) are July and August (10.1mph).
Average humidity in September
Mill Iron, MT
- Average humidity in September: 48%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is August (46%).
Average rainfall in September
Mill Iron, MT
- Average rainfall in September: 1.5"
The wettest month (with the highest rainfall) is May (2.6").
The driest months (with the least rainfall) are January and December (0.55").
Average rainfall days in September
Mill Iron, MT
- Average rainfall days in September: 9.5 days
The month with the highest number of rainy days is May (15.7 days).
The month with the least rainy days is January (3.1 days).
Average snowfall in September
Mill Iron, MT
- Average snowfall in September: 0.04"
The month with the highest snowfall is February (3.86").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Mill Iron, MT
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is February (12 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Mill Iron, MT
- 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 1min
The months with the most sunshine are July and August (Average sunshine: 11h and 36min).
The months with the least sunshine are February and December (Average sunshine: 4h and 48min).
Average sunshine days in September
Mill Iron, MT
- Average sunshine days in September: 17.8 days
The month with the most sunshine days is November (19.7 days).
The month with the least sunshine days is June (11.9 days).
Average UV index in September
Mill Iron, MT
- Average UV index in September: 4
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Mill Iron, MT
- Average cloud cover in September: 22
The month with the most cloud cover is February (Cloud cover 51).
The months with the least cloud cover are July and August (Cloud cover 18).
Average visibility in September
Mill Iron, MT
- 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).
Mill Iron, Montana, USA
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