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 arrival of September corresponds with a temperature reduction, down from August's warm 77.4°F (25.2°C) to an enjoyable 65.7°F (18.7°C). Despite drastic daily temperature oscillations, La Salle cools down to an average low-temperature of 39.9°F (4.4°C) in September.Humidity
In La Salle, the average relative humidity in September is 63%.Rainfall
In La Salle, in September, it is raining for 8.6 days, with typically 0.91" (23mm) of accumulated precipitation. Throughout the year, in La Salle, Montana, there are 142.8 rainfall days, and 17.36" (441mm) of precipitation is accumulated.Snowfall
Months with snowfall in La Salle are January through May, September through December. September is the first month it typically snows in La Salle. Throughout September, in the average 0.2 snowfall days, it receives 0.04" (1mm) of snow. Throughout the year, in La Salle, there are 104.7 snowfall days, and 51.34" (1304mm) of snow is accumulated.Daylight
In September, the average length of the day is 12h and 34min.On the first day of the month, sunrise is at 6:55 am and sunset at 8:17 pm. On the last day of September, in La Salle, sunrise is at 7:36 am and sunset at 7:17 pm MDT.
Sunshine
In La Salle, the average sunshine in September is 9.4h.UV index
The average daily maximum UV index in September in La Salle is 3. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for the ordinary person.Note: In September, the maximum UV index of 3 translates into these guidelines:
Adopt protective measures - Requirement to safeguard skin and eyes from harm exists. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
Frequently asked questions
What is the temperature in September in La Salle?
What is the average humidity in September in La Salle?
How much does it rain in La Salle in September?
When does it start to snow in La Salle?
What is the average length of the day in September in La Salle?
When are sunrise and sunset in September in La Salle?
How many hours of sunshine does La Salle have in September?
How high is the UV index in September in La Salle?
Average temperature in September
La Salle, MT
- Average high temperature in September: 65.7°F
The warmest month (with the highest average high temperature) is July (77.5°F).
The month with the lowest average high temperature is December (25.9°F).
- Average low temperature in September: 39.9°F
The month with the highest average low temperature is August (46.4°F).
The coldest month (with the lowest average low temperature) is February (14.4°F).
Average pressure in September
La Salle, MT
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
La Salle, MT
- Average wind speed in September: 3.8mph
The windiest month (with the highest average wind speed) is April (4.7mph).
The calmest month (with the lowest average wind speed) is August (3.7mph).
Average humidity in September
La Salle, MT
- Average humidity in September: 63%
The month with the highest relative humidity is January (93%).
The month with the lowest relative humidity is August (55%).
Average rainfall in September
La Salle, MT
- Average rainfall in September: 0.91"
The wettest month (with the highest rainfall) is June (2.05").
The driest month (with the least rainfall) is August (0.55").
Average rainfall days in September
La Salle, MT
- Average rainfall days in September: 8.6 days
The month with the highest number of rainy days is April (17.9 days).
The month with the least rainy days is August (6.6 days).
Average snowfall in September
La Salle, MT
- Average snowfall in September: 0.04"
The month with the highest snowfall is January (11.3").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
La Salle, MT
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is December (21.5 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
La Salle, MT
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 24min).
- Average sunshine in September: 9h and 2min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in September
La Salle, MT
- Average sunshine days in September: 19.6 days
The month with the most sunshine days is August (21.8 days).
The month with the least sunshine days is February (6.8 days).
Average UV index in September
La Salle, 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, February, November and December (UV index 1).
Average cloud cover in September
La Salle, MT
- Average cloud cover in September: 23
The month with the most cloud cover is January (Cloud cover 63).
The months with the least cloud cover are July and August (Cloud cover 15).
Average visibility in September
La Salle, 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 January (3mi).
La Salle, Montana, USA
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