September weather forecastPrinceton, MO
September
Weather in September
September, the first month of the autumn in Princeton, is still a warm month, with an average temperature varying between 57.4°F (14.1°C) and 76.8°F (24.9°C).Temperature
With the beginning of September, the average high-temperature shows a small decrease, transitioning from 82.9°F (28.3°C) in August to a still warm 76.8°F (24.9°C). Throughout September, the temperature tends to fall to a consistent average low of 57.4°F (14.1°C).Humidity
In September, the average relative humidity in Princeton is 76%.Rainfall
In Princeton, during September, the rain falls for 11.3 days and regularly aggregates up to 2.56" (65mm) of precipitation. In Princeton, during the entire year, the rain falls for 130.3 days and collects up to 25.43" (646mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
The average length of the day in September is 12h and 27min.On the first day of the month, sunrise is at 6:42 am and sunset at 7:45 pm. On the last day of September, sunrise is at 7:10 am and sunset at 6:57 pm CDT.
Sunshine
In September, the average sunshine is 9.3h.UV index
In September, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In September, the UV index of 5 transforms into the following advice:
Take care. Persons with lighter skin might suffer burns in less than 30 minutes. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Princeton, MO
- Average high temperature in September: 76.8°F
The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is January (32.5°F).
- Average low temperature in September: 57.4°F
The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (18.7°F).
Average pressure in September
Princeton, MO
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in September
Princeton, MO
- Average wind speed in September: 7.4mph
The windiest month (with the highest average wind speed) is March (10.1mph).
The calmest months (with the lowest average wind speed) are July and August (6.5mph).
Average humidity in September
Princeton, MO
- Average humidity in September: 76%
The month with the highest relative humidity is June (82%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Princeton, MO
- Average rainfall in September: 2.56"
The wettest month (with the highest rainfall) is June (3.78").
The driest month (with the least rainfall) is January (0.91").
Average rainfall days in September
Princeton, MO
- Average rainfall days in September: 11.3 days
The month with the highest number of rainy days is May (17.1 days).
The month with the least rainy days is February (4.5 days).
Average snowfall in September
Princeton, MO
- Average snowfall in September: 0"
The month with the highest snowfall is January (3.78").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Princeton, MO
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (7.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Princeton, MO
- 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: 9h and 18min
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 36min).
Average sunshine days in September
Princeton, MO
- Average sunshine days in September: 16.5 days
The month with the most sunshine days is November (20.7 days).
The months with the least sunshine days are May and June (11.2 days).
Average UV index in September
Princeton, MO
- Average UV index in September: 5
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, November and December (UV index 2).
Average cloud cover in September
Princeton, MO
- Average cloud cover in September: 29
The month with the most cloud cover is January (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 27).
Average visibility in September
Princeton, MO
- 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).
