September weather forecastPlainfield, IN
September
Weather in September
September brings a noticeable shift in weather as Plainfield begins to transition from the blazing summers into the charm of fall. The drastic decrease in temperature from August's 81°F (27.2°C) to 75.7°F (24.3°C) ushers in the cooler autumn temperatures. This noticeable shift signals the drift from summer garments to layers of fall fashion. The city landscapes slowly start their transformation, with autumnal hues of orange, red, and yellow beginning to replace the greens. Outdoor activities start to shift from summer leisure to the delightful fall festivities, making September a striking turning point.Temperature
The transition from August to September sees average high-temperatures adjusting to a still moderately hot 75.7°F (24.3°C), from a not significantly different 81°F (27.2°C). Plainfield, during September nights, observes an average temperature of 58.1°F (14.5°C).Humidity
In September, the average relative humidity is 77%.Rainfall
The months with the least rainfall are February and September Rain falls for 14.5 days and accumulates 2.32" (59mm) of rain.Snowfall
In Plainfield, snow does not fall in June through October.Daylight
In Plainfield, the average length of the day in September is 12h and 26min.On the first day of September, sunrise is at 7:14 am and sunset at 8:16 pm. On the last day of the month, sunrise is at 7:41 am and sunset at 7:29 pm EDT.
Sunshine
The average sunshine in September is 8.3h.UV index
In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the ordinary person.Note: The daily maximum UV index of 4 in September interprets into the following advice:
Make use of precautions - It is urged to ward off sun damage. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Plainfield, IN
- Average high temperature in September: 75.7°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (33.6°F).
- Average low temperature in September: 58.1°F
The month with the highest average low temperature is July (65.5°F).
The coldest month (with the lowest average low temperature) is January (21°F).
Average pressure in September
Plainfield, IN
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Plainfield, IN
- Average wind speed in September: 6.5mph
The windiest months (with the highest average wind speed) are January and February (9.9mph).
The calmest months (with the lowest average wind speed) are July and August (5.8mph).
Average humidity in September
Plainfield, IN
- Average humidity in September: 77%
The months with the highest relative humidity are July and December (82%).
The month with the lowest relative humidity is October (74%).
Average rainfall in September
Plainfield, IN
- Average rainfall in September: 2.32"
The wettest month (with the highest rainfall) is May (4.53").
The driest months (with the least rainfall) are February and September (2.32").
Average rainfall days in September
Plainfield, IN
- Average rainfall days in September: 14.5 days
The month with the highest number of rainy days is May (21.6 days).
The month with the least rainy days is January (9.5 days).
Average snowfall in September
Plainfield, IN
- Average snowfall in September: 0"
The month with the highest snowfall is January (4.21").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in September
Plainfield, 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
Plainfield, 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 24min).
- Average sunshine in September: 8h and 18min
The month with the most sunshine is June (Average sunshine: 10h and 6min).
The months with the least sunshine are January and December (Average sunshine: 4h and 6min).
Average sunshine days in September
Plainfield, IN
- Average sunshine days in September: 13 days
The month with the most sunshine days is November (15.6 days).
The month with the least sunshine days is May (7.3 days).
Average UV index in September
Plainfield, IN
- Average UV index in September: 4
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, October, November and December (UV index 2).
Average cloud cover in September
Plainfield, IN
- Average cloud cover in September: 33
The month with the most cloud cover is January (Cloud cover 59).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in September
Plainfield, IN
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, August, September, October and November (6mi).
The months with the lowest visibility are January, July and December (5mi).
