September weather forecastWest Harrison, IN
September
Weather in September
The first month of the autumn, September, is still a warm month in West Harrison, Indiana, with an average temperature varying between 77°F (25°C) and 58.1°F (14.5°C).Temperature
The advent of September brings a slight shift in average high-temperature, moving from 82.8°F (28.2°C) in August to a still moderately hot 77°F (25°C). West Harrison records an average low of 58.1°F (14.5°C) throughout the nights in September.Humidity
In September, the average relative humidity is 75%.Rainfall
In West Harrison, during September, the rain falls for 12.8 days and regularly aggregates up to 1.38" (35mm) of precipitation. In West Harrison, during the entire year, the rain falls for 154.1 days and collects up to 20" (508mm) of precipitation.Snowfall
In West Harrison, Indiana, snow does not fall in May through October.Daylight
In West Harrison, the average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 7:08 am and sunset at 8:09 pm. On the last day of September, in West Harrison, sunrise is at 7:35 am and sunset at 7:22 pm EDT.
Sunshine
The average sunshine in September in West Harrison is 8.5h.UV index
In West Harrison, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for the average person.Note: An average maximum UV index of 5 in September leads to these recommendations:
Preventative actions are necessary - Recommendations to ward off sunburn are given. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
West Harrison, IN
- Average high temperature in September: 77°F
The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is January (35.2°F).
- Average low temperature in September: 58.1°F
The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (23.2°F).
Average pressure in September
West Harrison, IN
- Average pressure in September: 30.03"Hg
The months with the highest atmospheric pressure are January and November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in September
West Harrison, IN
- Average wind speed in September: 5.8mph
The windiest month (with the highest average wind speed) is January (9.1mph).
The calmest months (with the lowest average wind speed) are July and August (5.3mph).
Average humidity in September
West Harrison, IN
- Average humidity in September: 75%
The months with the highest relative humidity are January, February and December (81%).
The month with the lowest relative humidity is October (74%).
Average rainfall in September
West Harrison, IN
- Average rainfall in September: 1.38"
The wettest month (with the highest rainfall) is May (2.76").
The driest month (with the least rainfall) is November (1.1").
Average rainfall days in September
West Harrison, IN
- Average rainfall days in September: 12.8 days
The month with the highest number of rainy days is May (18.8 days).
The month with the least rainy days is February (8 days).
Average snowfall in September
West Harrison, IN
- Average snowfall in September: 0"
The month with the highest snowfall is January (1.38").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
West Harrison, IN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (9.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
West Harrison, IN
- Average daylight in September: 12h and 24min
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 30min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days in September
West Harrison, IN
- Average sunshine days in September: 15.3 days
The month with the most sunshine days is November (18.1 days).
The month with the least sunshine days is May (10 days).
Average UV index in September
West Harrison, IN
- Average UV index in September: 5
The months with the highest UV index are May, June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
West Harrison, IN
- Average cloud cover in September: 32
The month with the most cloud cover is January (Cloud cover 59).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in September
West Harrison, IN
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
