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 snowfall in September
- Average snowfall 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 onset brings a negligible change in high-temperatures, falling from a warm 78.4°F (25.8°C) in August to an agreeable 72.7°F (22.6°C). An average low-temperature of 54°F (12.2°C) is common during the nights of September.Humidity
In Trenton, Pennsylvania, the average relative humidity in September is 80%.Rainfall
September is the month with the least rainfall. Rain falls for 11.5 days and accumulates 1.57" (40mm) of precipitation.Snowfall
In Trenton, snow does not fall in June through September.Daylight
In September, the average length of the day is 12h and 27min.On the first day of the month, sunrise is at 6:31 am and sunset at 7:36 pm. On the last day of September, sunrise is at 7:00 am and sunset at 6:47 pm EDT.
Sunshine
The average sunshine in September in Trenton is 8.7h.UV index
The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for average individuals.Note: The maximum daily UV index of 4 in September interprets into the following recommendations:
Exercise prevention - Warding off sunburn is urged. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. Boost your sun resistance with garments that are densely woven yet spacious.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in September?
What is the average humidity in September?
What is the driest month?
How many days does it rain in September?
When it does not snow?
Does it snow in September?
How many hours of daylight does Trenton have in September?
When is the sunrise / sunset in September?
How many hours of sunshine does Trenton have in September?
What is the UV index reading in September?
Average temperature in September
Trenton, PA
- Average high temperature in September: 72.7°F
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (31.6°F).
- Average low temperature in September: 54°F
The month with the highest average low temperature is July (61.5°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).
Average pressure in September
Trenton, PA
- Average pressure in September: 30.06"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in September
Trenton, PA
- Average wind speed in September: 5.5mph
The windiest month (with the highest average wind speed) is March (8.3mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in September
Trenton, PA
- Average humidity in September: 80%
The month with the highest relative humidity is February (83%).
The month with the lowest relative humidity is April (77%).
Average rainfall in September
Trenton, PA
- Average rainfall in September: 1.57"
The wettest month (with the highest rainfall) is May (2.72").
The driest month (with the least rainfall) is September (1.57").
Average rainfall days in September
Trenton, PA
- Average rainfall days in September: 11.5 days
The month with the highest number of rainy days is May (17.2 days).
The month with the least rainy days is January (5.8 days).
Average snowfall in September
Trenton, PA
- Average snowfall in September: 0"
The month with the highest snowfall is March (4.96").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Trenton, PA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (8.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Trenton, PA
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in September: 8h and 4min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The months with the least sunshine are January and February (Average sunshine: 4h and 18min).
Average sunshine days in September
Trenton, PA
- Average sunshine days in September: 17 days
The months with the most sunshine days are January and November (19.6 days).
The month with the least sunshine days is May (11.2 days).
Average UV index in September
Trenton, PA
- Average UV index in September: 4
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in September
Trenton, PA
- Average cloud cover in September: 39
The months with the most cloud cover are February and December (Cloud cover 54).
The month with the least cloud cover is July (Cloud cover 33).
Average visibility in September
Trenton, PA
- Average visibility in September: 5mi
The months with the highest visibility are April and November (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October and December (5mi).
Trenton, Pennsylvania, USA
Weather forecast for your location
2. Allow the app to use your location