September weather forecastLafayette, IN
September
Weather in September
September marks the onset of fall and brings a significant change to Lafayette's weather pattern. Temperatures start to decrease, with the highs dropping to about 75.6°F (24.2°C). The shift in weather is apparent with noticeably shorter days and a drop in humidity levels. As we trade summer for fall, September binds both warm afternoons and cool evenings - an amalgamation residents look forward to. With a change in season, Lafayette's landscape begins its transformation into shades of fall.Temperature
The advent of September brings an average high-temperature of a still warm 75.6°F (24.2°C), almost identical to the preceding month. September witnesses an average nighttime temperature of 57°F (13.9°C).Humidity
The average relative humidity in September in Lafayette, Indiana, is 78%.Rainfall
September is the month with the least rainfall. Rain falls for 11.2 days and accumulates 1.1" (28mm) of precipitation.Snowfall
In Lafayette, snow does not fall in May through October.Daylight
In Lafayette, the average length of the day in September is 12h and 27min.On the first day of the month, sunrise is at 7:15 am and sunset at 8:18 pm. On the last day of September, sunrise is at 7:43 am and sunset at 7:30 pm EDT.
Sunshine
In Lafayette, the average sunshine in September is 8.2h.UV index
In September, the average daily maximum UV index in Lafayette is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for average individuals.Note: A maximum daily UV index of 5 during September morphs into the following directions:
Take necessary precautions - Suggestions to elude sunburn are provided. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
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
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
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
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
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
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
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
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
Lafayette, IN
- Average daylight in September: 12h and 24min
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 12min
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
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
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
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
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).
