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 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
September's presence marks an average high-temperature of a still hot 87.3°F (30.7°C), subtly varied from August's 88.9°F (31.6°C). In September, Princeton's nights cool slightly to a consistent average temperature of 80.4°F (26.9°C).Heat index
September's average heat index is appraised at a very hot 98.6°F (37°C). Heightened precautions are necessary, heat cramps and heat exhaustion are potential risks. Continuous activity could lead to heatstroke.Understanding the heat index involves considering values for shaded locales with light wind. If directly exposed to the sun, the heat index could rise by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', is an amalgamation of air temperature and humidity to express the equivalent perceived temperature. The influence of weather can be personal, changing with an individual's body mass, height, and level of physical exertion. Direct sunlight can potentially raise the heat index by 15 Fahrenheit (8 Celsius) degrees, so it's crucial to consider. Heat index values remain especially vital for babies and toddlers. Young ones often do not realize the necessity to rest and replenish their fluids. Thirst is a delayed indication of dehydration - keeping hydrated, particularly in prolonged physical activity, is crucial.
The natural method the human body uses to remove excess heat is by perspiring and letting sweat evaporate. When the air holds a significant amount of moisture, the efficiency of the evaporation process is decreased, preventing the body from cooling down efficiently, leading to the sensation of overheating. Heat-related disorders may develop if heat gain in the body overshadows its cooling capacity, leading to elevated temperatures.
Humidity
In Princeton, the average relative humidity in September is 72%.Rainfall
In Princeton, in September, during 26.5 rainfall days, 5.71" (145mm) of precipitation is typically accumulated. In Princeton, during the entire year, the rain falls for 225.9 days and collects up to 40.91" (1039mm) of precipitation.Daylight
In Princeton, the average length of the day in September is 12h and 17min.On the first day of the month, sunrise is at 7:02 am and sunset at 7:40 pm. On the last day of September, sunrise is at 7:13 am and sunset at 7:09 pm EDT.
Sunshine
In September, the average sunshine is 8.9h.UV index
April through September, with an average maximum UV index of 7, are months with the highest UV index. A UV Index value of 6 to 7 symbolizes a high threat to health from unsafe exposure to UV radiation for average individuals.Note: The daily maximum UV index of 7 in September interprets into the following advice:
Deflect overexposure. Sun protection is a necessity. Limit your exposure to the sun's UV radiation, which is strongest between 10 a.m. and 4 p.m., and note that parasols or canopies may not provide full sun protection. Stay sun-safe with clothing that is both closely woven and worn loosely.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is it in September?
What is the average humidity in September?
How much does it rain in September?
What is the average length of the day in September?
When are sunrise and sunset in September?
How long on average sun shines in September?
What are the months with the highest UV index?
What is the UV index reading in September?
Average temperature in September
Princeton, FL
- Average high temperature in September: 87.3°F
The warmest month (with the highest average high temperature) is August (88.9°F).
The month with the lowest average high temperature is January (73.9°F).
- Average low temperature in September: 80.4°F
The month with the highest average low temperature is August (81.7°F).
The coldest month (with the lowest average low temperature) is January (63.1°F).
Average pressure in September
Princeton, FL
- Average pressure in September: 29.94"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are September and October (29.94"Hg).
Average wind speed in September
Princeton, FL
- Average wind speed in September: 7.5mph
The windiest month (with the highest average wind speed) is March (10.2mph).
The calmest month (with the lowest average wind speed) is July (7.1mph).
Average humidity in September
Princeton, FL
- Average humidity in September: 72%
The month with the highest relative humidity is December (75%).
The month with the lowest relative humidity is March (68%).
Average rainfall in September
Princeton, FL
- Average rainfall in September: 5.71"
The wettest month (with the highest rainfall) is August (6.77").
The driest month (with the least rainfall) is February (1.14").
Average rainfall days in September
Princeton, FL
- Average rainfall days in September: 26.5 days
The month with the highest number of rainy days is August (26.8 days).
The months with the least rainy days are January and February (12.5 days).
Average daylight in September /
Average sunshine in September
Princeton, FL
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 13h and 42min).
The month with the shortest days is December (Average daylight: 10h and 36min).
- Average sunshine in September: 8h and 5min
The month with the most sunshine is July (Average sunshine: 11h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 18min).
Average sunshine days in September
Princeton, FL
- Average sunshine days in September: 2.5 days
The month with the most sunshine days is March (14.3 days).
The month with the least sunshine days is August (2.1 days).
Average UV index in September
Princeton, FL
- Average UV index in September: 7
The months with the highest UV index are April, May, June, July, August and September (UV index 7).
The month with the lowest UV index is January (UV index 5).
Average cloud cover in September
Princeton, FL
- Average cloud cover in September: 30
The month with the most cloud cover is October (Cloud cover 36).
The month with the least cloud cover is April (Cloud cover 26).
Average visibility in September
Princeton, FL
- 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).
Princeton, Florida, USA
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