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
With the onset of September, Monarch experiences a modest temperature adjustment, with the average high-temperature receding from a pleasant 72.1°F (22.3°C) in August to an enjoyable 62.8°F (17.1°C). During the month of September, the nighttime temperature falls to an average of 41.5°F (5.3°C).Humidity
In September, the average relative humidity is 58%.Rainfall
In Monarch, during September, the rain falls for 11.2 days and regularly aggregates up to 1.73" (44mm) of precipitation. Throughout the year, in Monarch, there are 138.1 rainfall days, and 28.58" (726mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through June, August through December. In Monarch, in September, snow falls for 2.7 days, with typically accumulated 3.82" (97mm) of snow. Throughout the year, there are 137.4 snowfall days, and 110.08" (2796mm) of snow is accumulated.Daylight
In September, the average length of the day is 12h and 32min.On the first day of the month, sunrise is at 6:43 am and sunset at 8:02 pm. On the last day of September, sunrise is at 7:21 am and sunset at 7:04 pm MDT.
Sunshine
In September, the average sunshine is 9.6h.UV index
In Monarch, the average daily maximum UV index in September is 3. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for the average person.Note: The maximum daily UV index of 3 during September translates into the following directions:
Exercise prudence. Persons with fair skin could be burned in under 30 minutes. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. During bright days, sunglasses that offer UVA and UVB defense are recommended. Be on the lookout! Nearly twofold UV radiation from the Sun can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in September?
What is the average humidity in September?
How much does it rain in September?
How many days does it snow in September in Monarch?
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?
How high is the UV index in September?
Average temperature in September
Monarch, MT
- Average high temperature in September: 62.8°F
The warmest month (with the highest average high temperature) is July (73.9°F).
The month with the lowest average high temperature is December (24.3°F).
- Average low temperature in September: 41.5°F
The months with the highest average low temperature are July and August (48.2°F).
The coldest month (with the lowest average low temperature) is December (11.7°F).
Average pressure in September
Monarch, MT
- Average pressure in September: 29.95"Hg
The months with the highest atmospheric pressure are January and December (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in September
Monarch, MT
- Average wind speed in September: 7.1mph
The windiest month (with the highest average wind speed) is January (9.8mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity in September
Monarch, MT
- Average humidity in September: 58%
The month with the highest relative humidity is February (87%).
The month with the lowest relative humidity is August (53%).
Average rainfall in September
Monarch, MT
- Average rainfall in September: 1.73"
The wettest month (with the highest rainfall) is May (4.69").
The driest month (with the least rainfall) is December (1.26").
Average rainfall days in September
Monarch, MT
- Average rainfall days in September: 11.2 days
The month with the highest number of rainy days is June (20.9 days).
The month with the least rainy days is February (5.2 days).
Average snowfall in September
Monarch, MT
- Average snowfall in September: 3.82"
The month with the highest snowfall is April (19.29").
The month with the least snowfall is July (0").
Average snowfall days in September
Monarch, MT
- Average snowfall days in September: 2.7 days
The month with the highest number of snowfall days is March (20.3 days).
The month with the least snowfall days is July (0 days).
Average daylight in September /
Average sunshine in September
Monarch, MT
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in September: 9h and 4min
The month with the most sunshine is July (Average sunshine: 11h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).
Average sunshine days in September
Monarch, MT
- Average sunshine days in September: 15.5 days
The month with the most sunshine days is September (15.5 days).
The month with the least sunshine days is May (4.7 days).
Average UV index in September
Monarch, MT
- 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 and February (UV index 1).
Average cloud cover in September
Monarch, MT
- Average cloud cover in September: 26
The month with the most cloud cover is February (Cloud cover 57).
The months with the least cloud cover are July and August (Cloud cover 18).
Average visibility in September
Monarch, MT
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, August, September and October (6mi).
The month with the lowest visibility is February (4mi).
Monarch, Montana, USA
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