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 transition from August to September sees average high-temperatures adjusting to a still moderately hot 75.6°F (24.2°C), from a not significantly different 80.2°F (26.8°C). West Lafayette reports an average low-temperature of 57°F (13.9°C) during the nights of September.Humidity
In September, the average relative humidity in West Lafayette is 78%.Rainfall
The month with the least rainfall is September, when the rain falls for 11.2 days and typically collects 1.1" (28mm) of precipitation.Snowfall
May through October are months without snowfall.Daylight
In September, the average length of the day in West Lafayette is 12h and 27min.On the first day of September, sunrise is at 7:15 am and sunset at 8:19 pm. On the last day of the month, sunrise is at 7:43 am and sunset at 7:30 pm EDT.
Sunshine
In West Lafayette, the average sunshine in September is 8.2h.UV index
The average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for ordinary individuals.Note: The average daily UV index of 5 in September transforms into the following instructions:
Preventative actions are necessary - Recommendations to ward off sunburn are given. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in West Lafayette in September?
What is the average humidity in September in West Lafayette?
What is the driest month in West Lafayette?
How much does it rain in West Lafayette in September?
When it does not snow in West Lafayette?
What is the average length of the day in September in West Lafayette?
When is the sunrise / sunset in September in West Lafayette?
How long on average sun shines in September in West Lafayette?
How high is the UV index in September in West Lafayette?
Average temperature in September
West Lafayette, IN
- Average high temperature in September: 75.6°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (31.8°F).
- Average low temperature in September: 57°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).
Average pressure in September
West Lafayette, IN
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
West Lafayette, IN
- Average wind speed in September: 7.1mph
The windiest month (with the highest average wind speed) is January (10.3mph).
The calmest months (with the lowest average wind speed) are July and August (6.2mph).
Average humidity in September
West Lafayette, IN
- Average humidity in September: 78%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (73%).
Average rainfall in September
West Lafayette, IN
- Average rainfall in September: 1.1"
The wettest months (with the highest rainfall) are April and May (2.8").
The driest month (with the least rainfall) is September (1.1").
Average rainfall days in September
West Lafayette, IN
- Average rainfall days in September: 11.2 days
The month with the highest number of rainy days is May (18.5 days).
The month with the least rainy days is February (6.5 days).
Average snowfall in September
West Lafayette, IN
- Average snowfall in September: 0"
The months with the highest snowfall are January and February (2.44").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
West Lafayette, IN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (11.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
West Lafayette, IN
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in September: 8h and 1min
The months with the most sunshine are June and July (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in September
West Lafayette, IN
- Average sunshine days in September: 14.9 days
The month with the most sunshine days is November (18.3 days).
The month with the least sunshine days is May (9.8 days).
Average UV index in September
West Lafayette, IN
- Average UV index in September: 5
The months with the highest UV index are 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 Lafayette, IN
- Average cloud cover in September: 34
The month with the most cloud cover is January (Cloud cover 60).
The months with the least cloud cover are June and August (Cloud cover 33).
Average visibility in September
West Lafayette, 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).
West Lafayette, Indiana, USA
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