September weather forecastRim Rock Colony, MT
September
Weather in September
The first month of the autumn, September, is also an enjoyable month in Rim Rock Colony, Montana, with temperature in the range of an average low of 48.4°F (9.1°C) and an average high of 67.6°F (19.8°C).Temperature
As August transitions into September, Rim Rock Colony sees a drop in the average high-temperature, transitioning from a moderately hot 78.1°F (25.6°C) to an enjoyable 67.6°F (19.8°C). Throughout September, Rim Rock Colony experiences a low-temperature average of 48.4°F (9.1°C).Humidity
The average relative humidity in September is 49%.Rainfall
In Rim Rock Colony, in September, during 6.2 rainfall days, 0.71" (18mm) of precipitation is typically accumulated. Throughout the year, there are 70.4 rainfall days, and 8.46" (215mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, September through December. September is the first month it typically snows. Throughout September, in the average 0.8 snowfall days, it receives 0.51" (13mm) of snow. Throughout the year, in Rim Rock Colony, there are 54.3 snowfall days, and 19.49" (495mm) of snow is accumulated.Daylight
In Rim Rock Colony, the average length of the day in September is 12h and 34min.On the first day of September, sunrise is at 6:46 am and sunset at 8:09 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 7:08 pm MDT.
Sunshine
In September, the average sunshine is 9.6h.UV index
In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.Note: The maximum UV index of 4 during September leads to these instructions:
Stay alert. Light-skinned people could suffer burns in less than 30 minutes. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection. Remember! The Sun's UV radiation can be magnified almost twofold by the reflection of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Rim Rock Colony, MT
- Average high temperature in September: 67.6°F
The warmest month (with the highest average high temperature) is July (78.8°F).
The month with the lowest average high temperature is December (27.1°F).
- Average low temperature in September: 48.4°F
The month with the highest average low temperature is August (55.2°F).
The coldest month (with the lowest average low temperature) is December (15.3°F).
Average pressure in September
Rim Rock Colony, MT
- Average pressure in September: 29.95"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in September
Rim Rock Colony, MT
- Average wind speed in September: 9.5mph
The windiest month (with the highest average wind speed) is January (11.8mph).
The calmest months (with the lowest average wind speed) are July and August (8.8mph).
Average humidity in September
Rim Rock Colony, MT
- Average humidity in September: 49%
The month with the highest relative humidity is January (79%).
The month with the lowest relative humidity is August (43%).
Average rainfall in September
Rim Rock Colony, MT
- Average rainfall in September: 0.71"
The wettest month (with the highest rainfall) is June (1.77").
The driest month (with the least rainfall) is July (0.31").
Average rainfall days in September
Rim Rock Colony, MT
- Average rainfall days in September: 6.2 days
The month with the highest number of rainy days is May (10.4 days).
The month with the least rainy days is November (2.6 days).
Average snowfall in September
Rim Rock Colony, MT
- Average snowfall in September: 0.51"
The month with the highest snowfall is February (3.58").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Rim Rock Colony, MT
- Average snowfall days in September: 0.8 days
The month with the highest number of snowfall days is December (10.2 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Rim Rock Colony, MT
- Average daylight in September: 12h and 36min
The month with the longest days is June (Average daylight: 16h and 6min).
The month with the shortest days is December (Average daylight: 8h and 18min).
- Average sunshine in September: 9h and 36min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The months with the least sunshine are January and December (Average sunshine: 5h and 36min).
Average sunshine days in September
Rim Rock Colony, MT
- Average sunshine days in September: 22.4 days
The month with the most sunshine days is July (23.5 days).
The month with the least sunshine days is April (17.4 days).
Average UV index in September
Rim Rock Colony, 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
Rim Rock Colony, MT
- Average cloud cover in September: 23
The month with the most cloud cover is February (Cloud cover 43).
The month with the least cloud cover is July (Cloud cover 15).
Average visibility in September
Rim Rock Colony, 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).
