September weather forecastPrinceton, IN
September
Weather in September
The first month of the autumn, September, is still a warm month in Princeton, Indiana, with an average temperature varying between 78.6°F (25.9°C) and 60.4°F (15.8°C).Temperature
The initiation of September records an average high-temperature of a still moderately hot 78.6°F (25.9°C), displaying a near consistency with the previous month. September brings Princeton a consistent average low-temperature of 60.4°F (15.8°C).Humidity
The average relative humidity in September is 74%.Rainfall
The month with the least rainfall in Princeton is September, when the rain falls for 11.6 days and typically collects 1.38" (35mm) of precipitation.Snowfall
In Princeton, snow does not fall in May through October.Daylight
In September, the average length of the day is 12h and 25min.On the first day of the month, sunrise is at 6:20 am and sunset at 7:19 pm. On the last day of September, in Princeton, sunrise is at 6:45 am and sunset at 6:34 pm CDT.
Sunshine
In September, the average sunshine is 9h.UV index
In Princeton, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In September, an average UV index of 5 transforms into the following instructions:
Be vigilant - A duty to shield skin and eyes from injury exists. Minimize direct exposure to the Sun during midday when its radiation is at its peak. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Princeton, IN
- Average high temperature in September: 78.6°F
The warmest month (with the highest average high temperature) is July (84.6°F).
The month with the lowest average high temperature is January (37.9°F).
- Average low temperature in September: 60.4°F
The month with the highest average low temperature is July (67.6°F).
The coldest month (with the lowest average low temperature) is January (25.2°F).
Average pressure in September
Princeton, IN
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in September
Princeton, IN
- Average wind speed in September: 6.6mph
The windiest month (with the highest average wind speed) is February (10mph).
The calmest month (with the lowest average wind speed) is July (5.8mph).
Average humidity in September
Princeton, IN
- Average humidity in September: 74%
The months with the highest relative humidity are May and July (80%).
The month with the lowest relative humidity is October (70%).
Average rainfall in September
Princeton, IN
- Average rainfall in September: 1.38"
The wettest month (with the highest rainfall) is April (3.46").
The driest month (with the least rainfall) is September (1.38").
Average rainfall days in September
Princeton, IN
- Average rainfall days in September: 11.6 days
The month with the highest number of rainy days is May (17.9 days).
The month with the least rainy days is January (8.8 days).
Average snowfall in September
Princeton, IN
- Average snowfall in September: 0"
The month with the highest snowfall is January (1.57").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Princeton, IN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (6.7 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
Princeton, IN
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 9h and 0min
The month with the most sunshine is June (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).
Average sunshine days in September
Princeton, IN
- Average sunshine days in September: 16.5 days
The month with the most sunshine days is October (19.7 days).
The months with the least sunshine days are May and July (10.3 days).
Average UV index in September
Princeton, IN
- Average UV index in September: 5
The months with the highest UV index are May, 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
Princeton, IN
- Average cloud cover in September: 30
The month with the most cloud cover is January (Cloud cover 53).
The month with the least cloud cover is June (Cloud cover 27).
Average visibility in September
Princeton, 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).
