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 average high-temperature drops in September, from August's warm 81.1°F (27.3°C) to a pleasant 70.5°F (21.4°C). Simms witnesses a consistent average low-temperature of 49.5°F (9.7°C) throughout September.Humidity
The average relative humidity in September in Simms is 47%.Rainfall
In September, the rain falls for 8.7 days. Throughout September, 1.14" (29mm) of precipitation is accumulated. In Simms, Montana, during the entire year, the rain falls for 112.8 days and collects up to 12.95" (329mm) of precipitation.Snowfall
Months with snowfall in Simms, Montana, are January through May, September through December. September is the first month it typically snows. Throughout September, in the average 0.7 snowfall days, it receives 2.05" (52mm) of snow. In Simms, during the entire year, snow falls for 69.4 days and aggregates up to 35.35" (898mm) of snow.Daylight
The average length of the day in September is 12h and 33min.On the first day of the month, sunrise is at 6:47 am and sunset at 8:07 pm. On the last day of September, in Simms, Montana, sunrise is at 7:26 am and sunset at 7:08 pm MDT.
Sunshine
In September, the average sunshine in Simms is 9.6h.UV index
The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for average individuals.Note: A daily high UV index of 4 in September leads to these guidelines:
Be cautious. Those with fair skin can be subjected to burns in fewer than 30 minutes. It's recommended to limit sun exposure when its radiation is at its peak during midday. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature in Simms?
What is the average humidity in September in Simms?
How much does it rain in Simms in September?
When does it start to snow in Simms?
How many hours of daylight does Simms have in September?
When is the sunrise / sunset in September in Simms?
How long on average sun shines in September in Simms?
What is the UV index intensity in September in Simms?
Average temperature in September
Simms, MT
- Average high temperature in September: 70.5°F
The warmest month (with the highest average high temperature) is July (82.2°F).
The month with the lowest average high temperature is December (29.5°F).
- Average low temperature in September: 49.5°F
The month with the highest average low temperature is August (56.7°F).
The coldest month (with the lowest average low temperature) is December (17.4°F).
Average pressure in September
Simms, MT
- Average pressure in September: 29.96"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
Simms, MT
- Average wind speed in September: 8.2mph
The windiest months (with the highest average wind speed) are January and November (10.7mph).
The calmest month (with the lowest average wind speed) is August (7.3mph).
Average humidity in September
Simms, MT
- Average humidity in September: 47%
The month with the highest relative humidity is January (78%).
The month with the lowest relative humidity is August (41%).
Average rainfall in September
Simms, MT
- Average rainfall in September: 1.14"
The wettest month (with the highest rainfall) is June (2.05").
The driest months (with the least rainfall) are January and July (0.63").
Average rainfall days in September
Simms, MT
- Average rainfall days in September: 8.7 days
The month with the highest number of rainy days is May (15.2 days).
The month with the least rainy days is January (4.8 days).
Average snowfall in September
Simms, MT
- Average snowfall in September: 2.05"
The month with the highest snowfall is February (6.34").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Simms, MT
- Average snowfall days in September: 0.7 days
The month with the highest number of snowfall days is February (14.4 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Simms, MT
- 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: 9h and 4min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The months with the least sunshine are January and December (Average sunshine: 5h and 24min).
Average sunshine days in September
Simms, MT
- Average sunshine days in September: 18.8 days
The month with the most sunshine days is September (18.8 days).
The month with the least sunshine days is April (10.3 days).
Average UV index in September
Simms, MT
- 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
Simms, MT
- Average cloud cover in September: 24
The month with the most cloud cover is February (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 14).
Average visibility in September
Simms, 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).
Simms, Montana, USA
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