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
Lewiston measures an average high-temperature of a still moderately hot 74.8°F (23.8°C) in September, nearly consistent with the preceding month. In September, Lewiston experiences a temperature dip to an average of 56.8°F (13.8°C) at night.Humidity
The average relative humidity in September is 78%.Rainfall
In Lewiston, in September, during 11.6 rainfall days, 1.26" (32mm) of precipitation is typically accumulated. In Lewiston, Indiana, during the entire year, the rain falls for 151.2 days and collects up to 22.64" (575mm) of precipitation.Snowfall
June through October are months without snowfall.Daylight
The average length of the day in September in Lewiston is 12h and 27min.On the first day of the month, sunrise is at 6:15 am and sunset at 7:20 pm. On the last day of September, sunrise is at 6:44 am and sunset at 6:31 pm CDT.
Sunshine
The average sunshine in September is 8.3h.UV index
In September, the average daily maximum UV index in Lewiston is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for the average person.Note: The maximum daily UV index of 5 during September translates into the following directions:
Put precautions into practice - Ensuring skin and eye safety is a necessity. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. A hat with a broad brim is indispensable, filtering out up to half of UV rays.
Frequently asked questions
What is the temperature in September in Lewiston?
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?
What is the average length of the day in September in Lewiston?
When 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, IN
- Average high temperature in September: 74.8°F
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (30.4°F).
- Average low temperature in September: 56.8°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).
Average pressure in September
Lewiston, IN
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Lewiston, IN
- Average wind speed in September: 7.1mph
The windiest month (with the highest average wind speed) is January (10.2mph).
The calmest months (with the lowest average wind speed) are July and August (6.2mph).
Average humidity in September
Lewiston, IN
- Average humidity in September: 78%
The months with the highest relative humidity are July and August (84%).
The month with the lowest relative humidity is October (72%).
Average rainfall in September
Lewiston, IN
- Average rainfall in September: 1.26"
The wettest month (with the highest rainfall) is May (3.31").
The driest month (with the least rainfall) is January (1.02").
Average rainfall days in September
Lewiston, IN
- Average rainfall days in September: 11.6 days
The month with the highest number of rainy days is May (18.5 days).
The month with the least rainy days is January (6.3 days).
Average snowfall in September
Lewiston, IN
- Average snowfall in September: 0"
The month with the highest snowfall is February (3.23").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in September
Lewiston, IN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (11.8 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, IN
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in September: 8h and 2min
The months with the most sunshine are June and July (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in September
Lewiston, IN
- Average sunshine days in September: 15.8 days
The month with the most sunshine days is November (17.5 days).
The month with the least sunshine days is July (9.6 days).
Average UV index in September
Lewiston, IN
- Average UV index in September: 5
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Lewiston, IN
- Average cloud cover in September: 35
The month with the most cloud cover is January (Cloud cover 61).
The months with the least cloud cover are July, August and September (Cloud cover 35).
Average visibility in September
Lewiston, IN
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, February, July and August (5mi).
Lewiston, Indiana, USA
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