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
In Princeton, entering September brings a subtle temperature decrement, reducing from August's moderately hot 76.1°F (24.5°C) to a pleasant 68.4°F (20.2°C). Princeton usually reports an average low-temperature of 49.1°F (9.5°C) during the month of September.Humidity
In September, the average relative humidity is 79%.Rainfall
The month with the least rainfall in Princeton, Maine, is September, when the rain falls for 6.9 days and typically collects 0.51" (13mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
In Princeton, the average length of the day in September is 12h and 31min.On the first day of the month, sunrise is at 5:52 am and sunset at 7:07 pm. On the last day of September, in Princeton, sunrise is at 6:28 am and sunset at 6:12 pm EDT.
Sunshine
In September, the average sunshine is 7.7h.UV index
The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for average individuals.Note: The daily high UV index of 4 in September translates into this advice:
Ensure safety - Sun damage prevention is strongly urged. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.
Frequently asked questions
What are September temperatures in Princeton?
What is the average humidity in September in Princeton?
What is the driest month in Princeton?
How many days does it rain in September in Princeton?
When it does not snow in Princeton?
Does it snow in Princeton in September?
What is the average length of the day in September in Princeton?
What time are sunrise and sunset in September in Princeton?
How many hours of sunshine does Princeton have in September?
What is the UV index reading in September in Princeton?
Average temperature in September
Princeton, ME
- Average high temperature in September: 68.4°F
The warmest month (with the highest average high temperature) is July (77.2°F).
The month with the lowest average high temperature is January (26.1°F).
- Average low temperature in September: 49.1°F
The month with the highest average low temperature is July (56.1°F).
The coldest month (with the lowest average low temperature) is January (12.6°F).
Average pressure in September
Princeton, ME
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is September (30.03"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Princeton, ME
- Average wind speed in September: 6.2mph
The windiest month (with the highest average wind speed) is March (8mph).
The calmest month (with the lowest average wind speed) is August (5.6mph).
Average humidity in September
Princeton, ME
- Average humidity in September: 79%
The month with the highest relative humidity is February (88%).
The month with the lowest relative humidity is May (77%).
Average rainfall in September
Princeton, ME
- Average rainfall in September: 0.51"
The wettest month (with the highest rainfall) is November (1.06").
The driest month (with the least rainfall) is September (0.51").
Average rainfall days in September
Princeton, ME
- Average rainfall days in September: 6.9 days
The month with the highest number of rainy days is June (11.3 days).
The month with the least rainy days is February (3.4 days).
Average snowfall in September
Princeton, ME
- Average snowfall in September: 0"
The month with the highest snowfall is January (2.13").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Princeton, ME
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (10.4 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, ME
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in September: 7h and 4min
The month with the most sunshine is August (Average sunshine: 9h and 42min).
The month with the least sunshine is February (Average sunshine: 3h and 24min).
Average sunshine days in September
Princeton, ME
- Average sunshine days in September: 21 days
The month with the most sunshine days is September (21 days).
The month with the least sunshine days is April (15.9 days).
Average UV index in September
Princeton, ME
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are February, November and December (UV index 1).
Average cloud cover in September
Princeton, ME
- Average cloud cover in September: 42
The month with the most cloud cover is February (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 41).
Average visibility in September
Princeton, ME
- Average visibility in September: 5mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (5mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (5mi).
Princeton, Maine, USA
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