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 September, Lewis experiences a minor shift in meteorological conditions with average high-temperatures marked at a still moderately hot 77.5°F (25.3°C), closely mirroring the climate in August. September nights experience a consistent temperature drop to a moderate 58.8°F (14.9°C).Humidity
In September, the average relative humidity is 76%.Rainfall
September is the month with the least rainfall in Lewis. Rain falls for 11.2 days and accumulates 1.46" (37mm) of precipitation.Snowfall
In Lewis, snow does not fall in May through October.Daylight
In Lewis, the average length of the day in September is 12h and 26min.On the first day of September, sunrise is at 7:18 am and sunset at 8:19 pm. On the last day of the month, sunrise is at 7:44 am and sunset at 7:32 pm EDT.
Sunshine
The average sunshine in September is 8.6h.UV index
In Lewis, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for average individuals.Note: The daily high UV index of 5 in September translates into this advice:
Ensure safety - Imperative it is to shield skin and eyes from damage. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature?
What is the average humidity in September?
What is the driest month?
How many days does it rain in September?
When it does not snow?
What is the average length of the day in September?
When are sunrise and sunset in September?
How many hours of sunshine does Lewis have in September?
What is the UV index reading in September?
Average temperature in September
Lewis, IN
- Average high temperature in September: 77.5°F
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (35.8°F).
- Average low temperature in September: 58.8°F
The month with the highest average low temperature is July (66.4°F).
The coldest month (with the lowest average low temperature) is January (23°F).
Average pressure in September
Lewis, IN
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Lewis, IN
- Average wind speed in September: 6.5mph
The windiest month (with the highest average wind speed) is February (9.5mph).
The calmest months (with the lowest average wind speed) are July and August (5.7mph).
Average humidity in September
Lewis, IN
- Average humidity in September: 76%
The month with the highest relative humidity is July (82%).
The month with the lowest relative humidity is October (72%).
Average rainfall in September
Lewis, IN
- Average rainfall in September: 1.46"
The wettest month (with the highest rainfall) is April (3.66").
The driest month (with the least rainfall) is September (1.46").
Average rainfall days in September
Lewis, IN
- Average rainfall days in September: 11.2 days
The month with the highest number of rainy days is May (18.8 days).
The month with the least rainy days is January (8.2 days).
Average snowfall in September
Lewis, IN
- Average snowfall in September: 0"
The month with the highest snowfall is January (2.4").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Lewis, IN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (6.4 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Lewis, IN
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 8h and 4min
The month with the most sunshine is June (Average sunshine: 10h and 18min).
The month with the least sunshine is December (Average sunshine: 4h and 24min).
Average sunshine days in September
Lewis, IN
- Average sunshine days in September: 17.1 days
The month with the most sunshine days is October (19.8 days).
The month with the least sunshine days is May (9.1 days).
Average UV index in September
Lewis, IN
- Average UV index in September: 5
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Lewis, IN
- Average cloud cover in September: 30
The month with the most cloud cover is January (Cloud cover 55).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in September
Lewis, IN
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
Lewis, Indiana, USA
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