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
The transition into September involves a small decrease in the average high-temperature, dipping slightly from an agreeable 73°F (22.8°C) in August to a refreshing 65.5°F (18.6°C). Greenville, in the month of September, anticipates a consistent average low-temperature of 46°F (7.8°C).Humidity
The average relative humidity in September is 80%.Rainfall
In Greenville, in September, during 12.5 rainfall days, 2.44" (62mm) of precipitation is typically accumulated. In Greenville, during the entire year, the rain falls for 147.1 days and collects up to 34.65" (880mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
In September, the average length of the day is 12h and 31min.On the first day of the month, sunrise is at 6:00 am and sunset at 7:15 pm. On the last day of September, sunrise is at 6:36 am and sunset at 6:20 pm EDT.
Sunshine
In September, the average sunshine is 7.4h.UV index
The average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: The UV index of 3 in September translates into these instructions:
Heed the precautions - Protecting the skin and eyes from damage is compulsory. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures?
What is the average humidity in September?
How much does it rain in September?
When it does not snow?
Does it snow in September?
How many hours of daylight does Greenville have in September?
When is the sunrise / sunset in September?
How many hours of sunshine does Greenville have in September?
What is the UV index intensity in September?
Average temperature in September
Greenville, ME
- Average high temperature in September: 65.5°F
The warmest month (with the highest average high temperature) is July (74.8°F).
The month with the lowest average high temperature is January (20.8°F).
- Average low temperature in September: 46°F
The month with the highest average low temperature is July (54.5°F).
The coldest month (with the lowest average low temperature) is January (7.9°F).
Average pressure in September
Greenville, ME
- Average pressure in September: 30.04"Hg
The months with the highest atmospheric pressure are September and November (30.04"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in September
Greenville, ME
- Average wind speed in September: 5.8mph
The windiest month (with the highest average wind speed) is March (7.9mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).
Average humidity in September
Greenville, ME
- Average humidity in September: 80%
The month with the highest relative humidity is February (90%).
The month with the lowest relative humidity is May (77%).
Average rainfall in September
Greenville, ME
- Average rainfall in September: 2.44"
The wettest month (with the highest rainfall) is April (3.54").
The driest month (with the least rainfall) is February (2.24").
Average rainfall days in September
Greenville, ME
- Average rainfall days in September: 12.5 days
The months with the highest number of rainy days are July and August (17.8 days).
The month with the least rainy days is February (4.4 days).
Average snowfall in September
Greenville, ME
- Average snowfall in September: 0"
The month with the highest snowfall is January (14.33").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Greenville, ME
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (20.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Greenville, 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 2min
The month with the most sunshine is August (Average sunshine: 9h and 12min).
The month with the least sunshine is February (Average sunshine: 2h and 36min).
Average sunshine days in September
Greenville, ME
- Average sunshine days in September: 15.1 days
The month with the most sunshine days is September (15.1 days).
The month with the least sunshine days is February (8.1 days).
Average UV index in September
Greenville, ME
- Average UV index in September: 3
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 1).
Average cloud cover in September
Greenville, ME
- Average cloud cover in September: 46
The month with the most cloud cover is February (Cloud cover 73).
The months with the least cloud cover are July and August (Cloud cover 45).
Average visibility in September
Greenville, ME
- Average visibility in September: 4mi
The months with the highest visibility are May, July, October and November (5mi).
The months with the lowest visibility are January, February, March, April, June, August, September and December (4mi).
Greenville, Maine, USA
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