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
Jefferson's weather subtly changes with the onset of September, barely falling from an agreeable 72.7°F (22.6°C) in August to an enjoyable 66.6°F (19.2°C). Throughout September, the average low-temperature dips to a fresh 53.4°F (11.9°C).Humidity
In September, the average relative humidity is 81%.Rainfall
In September, in Jefferson, the rain falls for 10.1 days. Throughout September, 1.61" (41mm) of precipitation is accumulated. Throughout the year, there are 144.1 rainfall days, and 29.29" (744mm) of precipitation is accumulated.Snowfall
May through September are months without snowfall.Daylight
In September, the average length of the day is 12h and 30min.On the first day of September in Jefferson, Maine, sunrise is at 6:01 am and sunset at 7:13 pm. On the last day of the month, sunrise is at 6:35 am and sunset at 6:19 pm EDT.
Sunshine
The average sunshine in September is 8.5h.UV index
In Jefferson, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: The maximum daily UV index, 4 in September, converts into the following recommendations:
Be vigilant - Preventing sunburn is recommended. To protect against the Sun's most potent rays, avoid direct exposure around midday. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays.
Frequently asked questions
What is the average September temperature in Jefferson?
What is the average humidity in September in Jefferson?
How much does it rain in Jefferson in September?
When it does not snow in Jefferson?
Does it snow in Jefferson in September?
How many hours of daylight does Jefferson have in September?
When is the sunrise / sunset in September in Jefferson?
How long on average sun shines in September in Jefferson?
What is the UV index reading in September in Jefferson?
Average temperature in September
Jefferson, ME
- Average high temperature in September: 66.6°F
The warmest month (with the highest average high temperature) is August (72.7°F).
The month with the lowest average high temperature is January (29.8°F).
- Average low temperature in September: 53.4°F
The month with the highest average low temperature is July (59.2°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).
Average pressure in September
Jefferson, ME
- Average pressure in September: 30.04"Hg
The month with the highest atmospheric pressure is September (30.04"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Jefferson, ME
- Average wind speed in September: 7.9mph
The windiest month (with the highest average wind speed) is January (11.6mph).
The calmest months (with the lowest average wind speed) are July and August (6.8mph).
Average humidity in September
Jefferson, ME
- Average humidity in September: 81%
The months with the highest relative humidity are June and July (83%).
The month with the lowest relative humidity is November (76%).
Average rainfall in September
Jefferson, ME
- Average rainfall in September: 1.61"
The wettest month (with the highest rainfall) is December (3.27").
The driest month (with the least rainfall) is July (1.57").
Average rainfall days in September
Jefferson, ME
- Average rainfall days in September: 10.1 days
The month with the highest number of rainy days is May (15.5 days).
The month with the least rainy days is January (7.5 days).
Average snowfall in September
Jefferson, ME
- Average snowfall in September: 0"
The month with the highest snowfall is January (4.37").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Jefferson, ME
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (9.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Jefferson, ME
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in September: 8h and 3min
The month with the most sunshine is August (Average sunshine: 10h and 24min).
The months with the least sunshine are February and December (Average sunshine: 4h and 36min).
Average sunshine days in September
Jefferson, ME
- Average sunshine days in September: 18.3 days
The month with the most sunshine days is September (18.3 days).
The month with the least sunshine days is April (11.4 days).
Average UV index in September
Jefferson, 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 January, February, March, November and December (UV index 2).
Average cloud cover in September
Jefferson, ME
- Average cloud cover in September: 33
The months with the most cloud cover are February, March, April and December (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in September
Jefferson, ME
- 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).
Jefferson, Maine, USA
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