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
September brings a drop in Cliff Lake's average high-temperature, falling from an agreeable 71.2°F (21.8°C) in August to an enjoyable 61.7°F (16.5°C). Compared to daytime temperatures, Cliff Lake's temperature drops significantly, averaging an icy 37.6°F (3.1°C) during the nights of September.Humidity
In September, the average relative humidity is 58%.Rainfall
In Cliff Lake, during September, the rain falls for 10.5 days and regularly aggregates up to 1.42" (36mm) of precipitation. In Cliff Lake, during the entire year, the rain falls for 123.8 days and collects up to 24.53" (623mm) of precipitation.Snowfall
Months with snowfall are January through July, September through December. September is the first month it typically snows in Cliff Lake. Throughout September, in the average 1.9 snowfall days, it receives 2.36" (60mm) of snow. Throughout the year, there are 165.6 snowfall days, and 125.16" (3179mm) of snow is accumulated.Daylight
In September, the average length of the day is 12h and 30min.On the first day of September, sunrise is at 6:49 am and sunset at 8:02 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 7:07 pm MDT.
Sunshine
In Cliff Lake, the average sunshine in September is 9.8h.UV index
In September, the average daily maximum UV index is 2. A UV Index value of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV rays for average individuals.Note: The daily high UV index of 2 in September translates into this advice:
Long-term sun exposure is typically not a concern for most. However, those with sensitive skin, infants, and children must always have protection. To protect against the Sun's most potent rays, avoid direct exposure around midday. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature?
What is the average humidity in September?
How much does it rain in September?
When does it start to snow?
What is the average length of the day in September in Cliff Lake?
When are sunrise and sunset in September?
How long on average sun shines in September?
What is the UV index reading in September?
Average temperature in September
Cliff Lake, MT
- Average high temperature in September: 61.7°F
The warmest month (with the highest average high temperature) is July (73.2°F).
The month with the lowest average high temperature is December (20.5°F).
- Average low temperature in September: 37.6°F
The month with the highest average low temperature is August (43°F).
The coldest month (with the lowest average low temperature) is December (4.8°F).
Average pressure in September
Cliff Lake, MT
- Average pressure in September: 29.99"Hg
The month with the highest atmospheric pressure is January (30.24"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Cliff Lake, MT
- Average wind speed in September: 5.5mph
The windiest months (with the highest average wind speed) are January, February, March, June, November and December (6.2mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).
Average humidity in September
Cliff Lake, MT
- Average humidity in September: 58%
The month with the highest relative humidity is February (94%).
The month with the lowest relative humidity is August (52%).
Average rainfall in September
Cliff Lake, MT
- Average rainfall in September: 1.42"
The wettest month (with the highest rainfall) is May (3.11").
The driest month (with the least rainfall) is July (0.91").
Average rainfall days in September
Cliff Lake, MT
- Average rainfall days in September: 10.5 days
The month with the highest number of rainy days is May (20.5 days).
The month with the least rainy days is January (4 days).
Average snowfall in September
Cliff Lake, MT
- Average snowfall in September: 2.36"
The month with the highest snowfall is February (20.67").
The month with the least snowfall is August (0").
Average snowfall days in September
Cliff Lake, MT
- Average snowfall days in September: 1.9 days
The month with the highest number of snowfall days is March (26.4 days).
The month with the least snowfall days is August (0 days).
Average daylight in September /
Average sunshine in September
Cliff Lake, MT
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in September: 9h and 5min
The month with the most sunshine is July (Average sunshine: 11h and 42min).
The months with the least sunshine are January and February (Average sunshine: 3h and 36min).
Average sunshine days in September
Cliff Lake, MT
- Average sunshine days in September: 16.4 days
The month with the most sunshine days is September (16.4 days).
The month with the least sunshine days is May (3.8 days).
Average UV index in September
Cliff Lake, MT
- Average UV index in September: 2
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 1).
Average cloud cover in September
Cliff Lake, MT
- Average cloud cover in September: 23
The month with the most cloud cover is February (Cloud cover 73).
The months with the least cloud cover are July and August (Cloud cover 17).
Average visibility in September
Cliff Lake, MT
- Average visibility in September: 6mi
The months with the highest visibility are June, July, August, September and October (6mi).
The months with the lowest visibility are January and February (3mi).
Cliff Lake, Montana, USA
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