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 moderately hot 75.4°F (24.1°C) to a refreshing 65.8°F (18.8°C). The September nights bear witness to a significant drop from the daytime highs, settling at an average temperature of 42.1°F (5.6°C).Humidity
In Lima, the average relative humidity in September is 48%.Rainfall
In Lima, in September, during 7.8 rainfall days, 0.75" (19mm) of precipitation is typically accumulated. Throughout the year, there are 103.2 rainfall days, and 9.84" (250mm) of precipitation is accumulated.Snowfall
January through June, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.9 snowfall days, it receives 1.22" (31mm) of snow. Throughout the year, in Lima, there are 81.9 snowfall days, and 31.65" (804mm) of snow is accumulated.Daylight
In September, the average length of the day is 12h and 30min.On the first day of the month, sunrise is at 6:53 am and sunset at 8:06 pm. On the last day of September, sunrise is at 7:28 am and sunset at 7:12 pm MDT.
Sunshine
In Lima, the average sunshine in September is 9.7h.UV index
The average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for the ordinary person.Note: In September, a daily maximum UV index of 3 leads to the following instructions:
Be careful. Light complexion individuals might get burns in fewer than 30 minutes. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. During bright days, sunglasses that offer UVA and UVB defense are recommended. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September?
What is the average humidity in September?
How much does it rain in September?
When does it start snowing?
How many hours of daylight does Lima have in September?
When is the sunrise / sunset in September?
How long on average sun shines in September in Lima?
What is the UV index reading in September?
Average temperature in September
Lima, MT
- Average high temperature in September: 65.8°F
The warmest month (with the highest average high temperature) is July (76.6°F).
The month with the lowest average high temperature is December (24.3°F).
- Average low temperature in September: 42.1°F
The month with the highest average low temperature is July (47.1°F).
The coldest month (with the lowest average low temperature) is December (9.9°F).
Average pressure in September
Lima, MT
- Average pressure in September: 29.99"Hg
The month with the highest atmospheric pressure is January (30.25"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Lima, MT
- Average wind speed in September: 5.8mph
The windiest months (with the highest average wind speed) are November and December (7.3mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).
Average humidity in September
Lima, MT
- Average humidity in September: 48%
The months with the highest relative humidity are January and February (86%).
The months with the lowest relative humidity are July and August (43%).
Average rainfall in September
Lima, MT
- Average rainfall in September: 0.75"
The wettest month (with the highest rainfall) is June (1.73").
The driest month (with the least rainfall) is January (0.43").
Average rainfall days in September
Lima, MT
- Average rainfall days in September: 7.8 days
The month with the highest number of rainy days is May (13.7 days).
The month with the least rainy days is January (4.6 days).
Average snowfall in September
Lima, MT
- Average snowfall in September: 1.22"
The month with the highest snowfall is April (4.96").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Lima, MT
- Average snowfall days in September: 0.9 days
The month with the highest number of snowfall days is February (13.3 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Lima, 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 4min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 5h and 54min).
Average sunshine days in September
Lima, MT
- Average sunshine days in September: 18.4 days
The month with the most sunshine days is July (20.7 days).
The month with the least sunshine days is April (10.7 days).
Average UV index in September
Lima, MT
- Average UV index in September: 3
The month with the highest UV index is July (UV index 5).
The month with the lowest UV index is February (UV index 1).
Average cloud cover in September
Lima, MT
- Average cloud cover in September: 19
The month with the most cloud cover is February (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 13).
Average visibility in September
Lima, MT
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is February (4mi).
Lima, Montana, USA
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