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 indicates a minor shift in the average high-temperature, from August's warm 76.6°F (24.8°C) to an agreeable 70.5°F (21.4°C). The average low-temperature in Lewiston during September nights is a cool 51.8°F (11°C).Humidity
In September, the average relative humidity in Lewiston, Minnesota, is 80%.Rainfall
In September, the rain falls for 11.9 days. Throughout September, 1.89" (48mm) of precipitation is accumulated. Throughout the year, in Lewiston, there are 122.7 rainfall days, and 24.06" (611mm) of precipitation is accumulated.Snowfall
In Lewiston, snow does not fall in June through September.Daylight
In September, the average length of the day is 12h and 29min.On the first day of September, sunrise is at 6:31 am and sunset at 7:42 pm. On the last day of the month, sunrise is at 7:04 am and sunset at 6:49 pm CDT.
Sunshine
The average sunshine in September is 8.5h.UV index
In September, the average daily maximum UV index in Lewiston is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for average individuals.Note: In September, a regular UV index of 4 translates into these guidelines:
Take necessary precautions - Defending against sun damage is advocated. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Lewiston in September?
What is the average humidity in September in Lewiston?
How much does it rain in Lewiston in September?
When it does not snow in Lewiston?
Does it snow in Lewiston in September?
What is the average length of the day in September in Lewiston?
What time are sunrise and sunset in September in Lewiston?
How many hours of sunshine does Lewiston have in September?
What is the UV index intensity in September in Lewiston?
Average temperature in September
Lewiston, MN
- Average high temperature in September: 70.5°F
The warmest month (with the highest average high temperature) is July (78.3°F).
The month with the lowest average high temperature is January (20.7°F).
- Average low temperature in September: 51.8°F
The month with the highest average low temperature is July (61.3°F).
The coldest month (with the lowest average low temperature) is January (7.5°F).
Average pressure in September
Lewiston, MN
- Average pressure in September: 30.01"Hg
The months with the highest atmospheric pressure are January and February (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in September
Lewiston, MN
- Average wind speed in September: 8mph
The windiest month (with the highest average wind speed) is April (10.1mph).
The calmest month (with the lowest average wind speed) is August (7mph).
Average humidity in September
Lewiston, MN
- Average humidity in September: 80%
The month with the highest relative humidity is January (91%).
The month with the lowest relative humidity is October (75%).
Average rainfall in September
Lewiston, MN
- Average rainfall in September: 1.89"
The wettest month (with the highest rainfall) is June (4.33").
The driest month (with the least rainfall) is January (0.75").
Average rainfall days in September
Lewiston, MN
- Average rainfall days in September: 11.9 days
The month with the highest number of rainy days is June (18.2 days).
The month with the least rainy days is February (1.9 days).
Average snowfall in September
Lewiston, MN
- Average snowfall in September: 0"
The month with the highest snowfall is February (5.94").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Lewiston, MN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (14.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Lewiston, MN
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in September: 8h and 3min
The month with the most sunshine is July (Average sunshine: 9h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 12min).
Average sunshine days in September
Lewiston, MN
- Average sunshine days in September: 15.1 days
The month with the most sunshine days is November (18 days).
The month with the least sunshine days is June (9.3 days).
Average UV index in September
Lewiston, MN
- Average UV index in September: 4
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
Lewiston, MN
- Average cloud cover in September: 37
The month with the most cloud cover is January (Cloud cover 67).
The month with the least cloud cover is August (Cloud cover 33).
Average visibility in September
Lewiston, MN
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March, July and December (5mi).
Lewiston, Minnesota, USA
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