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 sea temperature 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
Deer Isle, Maine, ushers in September with an average high-temperature of a comfortable 63.9°F (17.7°C), showing a close resemblance to the previous month. During September, Deer Isle's temperature falls to a steady low-temperature average of 54.7°F (12.6°C).Humidity
In September, the average relative humidity is 82%.Rainfall
September is the month with the least rainfall in Deer Isle. Rain falls for 8.7 days and accumulates 0.91" (23mm) of precipitation.Snowfall
May through September are months without snowfall.Ocean temperature
In Deer Isle, the average seawater temperature in September is 56.8°F (13.8°C).Note: Without suitable protection, venturing into 56.8°F (13.8°C) waters cooler than 50°F (10°C) can lead to pronounced cold shock and rapid breaths.
Daylight
The average length of the day in September is 12h and 30min.On the first day of the month, sunrise is at 5:58 am and sunset at 7:10 pm. On the last day of September, in Deer Isle, Maine, sunrise is at 6:32 am and sunset at 6:16 pm EDT.
Sunshine
The average sunshine in September is 8.5h.UV index
In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for the average person.Note: In September, a daily UV index of 4 turns into the following recommendations:
Adopt protective measures - Suggestions to resist sunburn are offered. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.
Frequently asked questions
What is the temperature in September in Deer Isle?
What is the average humidity in September in Deer Isle?
What is the driest month in Deer Isle?
How many days does it rain in September in Deer Isle?
When it does not snow in Deer Isle?
Does it snow in Deer Isle in September?
How cold is the water in September in Deer Isle?
How many hours of daylight does Deer Isle have in September?
When is the sunrise / sunset in September in Deer Isle?
How many hours of sunshine does Deer Isle have in September?
What is the UV index intensity in September in Deer Isle?
Average temperature in September
Deer Isle, ME
- Average high temperature in September: 63.9°F
The warmest month (with the highest average high temperature) is August (68.9°F).
The month with the lowest average high temperature is January (31.5°F).
- Average low temperature in September: 54.7°F
The month with the highest average low temperature is August (59.9°F).
The coldest month (with the lowest average low temperature) is January (21°F).
Average pressure in September
Deer Isle, 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
Deer Isle, ME
- Average wind speed in September: 9.2mph
The windiest month (with the highest average wind speed) is January (14.4mph).
The calmest months (with the lowest average wind speed) are July and August (7.8mph).
Average humidity in September
Deer Isle, ME
- Average humidity in September: 82%
The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is November (76%).
Average rainfall in September
Deer Isle, ME
- Average rainfall in September: 0.91"
The wettest month (with the highest rainfall) is October (2.09").
The driest month (with the least rainfall) is September (0.91").
Average rainfall days in September
Deer Isle, ME
- Average rainfall days in September: 8.7 days
The month with the highest number of rainy days is July (12.8 days).
The month with the least rainy days is February (5.3 days).
Average snowfall in September
Deer Isle, ME
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.32").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Deer Isle, ME
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (7.7 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average sea temperature in September
Deer Isle, ME
- Average sea temperature in September: 56.8°F
The best month for swimming (with the highest average sea temperature) is August (58.6°F).
The coldest month (with the lowest average sea temperature) is March (38.2°F).
Average daylight in September /
Average sunshine in September
Deer Isle, 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 month with the least sunshine is December (Average sunshine: 4h and 30min).
Average sunshine days in September
Deer Isle, ME
- Average sunshine days in September: 19.9 days
The month with the most sunshine days is September (19.9 days).
The month with the least sunshine days is July (15.4 days).
Average UV index in September
Deer Isle, 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
Deer Isle, ME
- Average cloud cover in September: 32
The months with the most cloud cover are February and March (Cloud cover 52).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility in September
Deer Isle, 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).
Deer Isle, Maine, USA
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