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
In Saint Ignatius, the average high-temperature in September drops from a moderately hot 79.3°F (26.3°C) in August to an agreeable 68.5°F (20.3°C). Despite the drastic temperature difference, Saint Ignatius records an average nighttime low of 42.3°F (5.7°C) throughout September.Humidity
In Saint Ignatius, the average relative humidity in September is 58%.Rainfall
In Saint Ignatius, in September, during 9.3 rainfall days, 0.91" (23mm) of precipitation is typically accumulated. Throughout the year, there are 129.9 rainfall days, and 13.5" (343mm) 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 0.2 snowfall days, it receives 0.47" (12mm) of snow. In Saint Ignatius, during the entire year, snow falls for 67.1 days and aggregates up to 28.27" (718mm) of snow.Daylight
In Saint Ignatius, Montana, the average length of the day in September is 12h and 32min.On the first day of September, sunrise is at 6:56 am and sunset at 8:15 pm. On the last day of the month, sunrise is at 7:35 am and sunset at 7:17 pm MDT.
Sunshine
The average sunshine in September is 9.3h.UV index
The average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for the average person.Note: During September, 3 as the daily maximum UV index converts into the following advice:
Take precautions - Protection against skin and eye damage is obliged. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Beware! Reflection from snow can magnify the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in September?
What is the average humidity in September?
How many days does it rain in September?
When does it start snowing?
What is the average length of the day in September?
When are sunrise and sunset in September in Saint Ignatius?
How many hours of sunshine does Saint Ignatius have in September?
What is the UV index intensity in September in Saint Ignatius?
Average temperature in September
Saint Ignatius, MT
- Average high temperature in September: 68.5°F
The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is December (28.4°F).
- Average low temperature in September: 42.3°F
The month with the highest average low temperature is August (49.5°F).
The coldest month (with the lowest average low temperature) is December (16.7°F).
Average pressure in September
Saint Ignatius, MT
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.18"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Saint Ignatius, MT
- Average wind speed in September: 4mph
The windiest month (with the highest average wind speed) is April (4.8mph).
The calmest months (with the lowest average wind speed) are January, August and December (3.9mph).
Average humidity in September
Saint Ignatius, MT
- Average humidity in September: 58%
The month with the highest relative humidity is January (91%).
The month with the lowest relative humidity is August (49%).
Average rainfall in September
Saint Ignatius, MT
- Average rainfall in September: 0.91"
The wettest month (with the highest rainfall) is June (2.2").
The driest months (with the least rainfall) are July and August (0.63").
Average rainfall days in September
Saint Ignatius, MT
- Average rainfall days in September: 9.3 days
The month with the highest number of rainy days is June (15.7 days).
The month with the least rainy days is August (7.4 days).
Average snowfall in September
Saint Ignatius, MT
- Average snowfall in September: 0.47"
The month with the highest snowfall is February (6.5").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Saint Ignatius, MT
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is December (14.5 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Saint Ignatius, 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 2min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).
Average sunshine days in September
Saint Ignatius, MT
- Average sunshine days in September: 18.2 days
The month with the most sunshine days is July (20.8 days).
The month with the least sunshine days is February (11 days).
Average UV index in September
Saint Ignatius, 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 February and December (UV index 1).
Average cloud cover in September
Saint Ignatius, MT
- Average cloud cover in September: 23
The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is August (Cloud cover 14).
Average visibility in September
Saint Ignatius, MT
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February and December (4mi).
Saint Ignatius, Montana, USA
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