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
Onset of September comes with a temperature decline, the average high falling from a warm 78.8°F (26°C) in August to a comfortable 67.3°F (19.6°C). Saint Regis in September observes a sharp transition from the daytime heat, falling to an average low of 39.7°F (4.3°C).Humidity
In September, the average relative humidity in Saint Regis is 63%.Rainfall
In Saint Regis, during September, the rain falls for 7.8 days and regularly aggregates up to 0.59" (15mm) of precipitation. Throughout the year, there are 152.1 rainfall days, and 22.09" (561mm) of precipitation is accumulated.Snowfall
January through May, September through December are months with snowfall in Saint Regis, Montana. September is the first month it typically snows. Throughout September, in the average 0.3 snowfall days, it receives 0.31" (8mm) of snow. In Saint Regis, Montana, during the entire year, snow falls for 90.2 days and aggregates up to 58.15" (1477mm) of snow.Daylight
In Saint Regis, Montana, the average length of the day in September is 12h and 32min.On the first day of September, sunrise is at 7:00 am and sunset at 8:19 pm. On the last day of the month, sunrise is at 7:39 am and sunset at 7:21 pm MDT.
Sunshine
The average sunshine in September is 9h.UV index
In Saint Regis, the average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: During September, 3 as the daily maximum UV index converts into the following advice:
Undertake precautions - Guarding against sun damage is counselled. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Observe! Snow reflection can nearly intensify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature in Saint Regis?
What is the average humidity in September in Saint Regis?
How many days does it rain in September in Saint Regis?
When does it start snowing in Saint Regis?
What is the average length of the day in September in Saint Regis?
What time are sunrise and sunset in September in Saint Regis?
How many hours of sunshine does Saint Regis have in September?
How high is the UV index in September in Saint Regis?
Average temperature in September
Saint Regis, MT
- Average high temperature in September: 67.3°F
The warmest months (with the highest average high temperature) are July and August (78.8°F).
The month with the lowest average high temperature is December (28.9°F).
- Average low temperature in September: 39.7°F
The month with the highest average low temperature is August (45.7°F).
The coldest month (with the lowest average low temperature) is December (16.2°F).
Average pressure in September
Saint Regis, MT
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Saint Regis, MT
- Average wind speed in September: 4.2mph
The windiest month (with the highest average wind speed) is April (4.9mph).
The calmest month (with the lowest average wind speed) is December (4mph).
Average humidity in September
Saint Regis, MT
- 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 (53%).
Average rainfall in September
Saint Regis, MT
- Average rainfall in September: 0.59"
The wettest month (with the highest rainfall) is January (3.11").
The driest month (with the least rainfall) is August (0.39").
Average rainfall days in September
Saint Regis, MT
- Average rainfall days in September: 7.8 days
The month with the highest number of rainy days is March (19.9 days).
The month with the least rainy days is August (5.9 days).
Average snowfall in September
Saint Regis, MT
- Average snowfall in September: 0.31"
The month with the highest snowfall is February (15.12").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Saint Regis, MT
- Average snowfall days in September: 0.3 days
The month with the highest number of snowfall days is December (20.4 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Saint Regis, 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 0min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).
Average sunshine days in September
Saint Regis, MT
- Average sunshine days in September: 20.3 days
The months with the most sunshine days are July and August (23.3 days).
The month with the least sunshine days is March (5.8 days).
Average UV index in September
Saint Regis, MT
- Average UV index in September: 3
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 1).
Average cloud cover in September
Saint Regis, MT
- Average cloud cover in September: 25
The month with the most cloud cover is February (Cloud cover 66).
The months with the least cloud cover are July and August (Cloud cover 15).
Average visibility in September
Saint Regis, MT
- Average visibility in September: 6mi
The months with the highest visibility are June, July, August and September (6mi).
The months with the lowest visibility are January, February and December (3mi).
Saint Regis, Montana, USA
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