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 weather displays an average high-temperature of a still refreshing 61.7°F (16.5°C), slightly varied from August's 65.7°F (18.7°C). Isle au Haut's nocturnal readings in September exhibit minimal variation from the daytime temperatures, averaging at a mild 57.4°F (14.1°C).Humidity
The average relative humidity in September in Isle au Haut is 82%.Rainfall
The months with the least rainfall are August and September Rain falls for 7.8 days and accumulates 0.55" (14mm) of rain.Snowfall
In Isle au Haut, snow does not fall in May through October.Daylight
In September, the average length of the day 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, sunrise is at 6:31 am and sunset at 6:16 pm EDT.
Sunshine
In Isle au Haut, the average sunshine in September is 8.5h.UV index
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 the average person.Note: The maximum daily UV index of 4 in September interprets into the following recommendations:
Be careful. Light complexion individuals might get burns in fewer than 30 minutes. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September?
What is the average humidity in September?
What is the driest month?
How much does it rain in September?
When it does not snow?
What is the average length of the day in September?
When is the sunrise / sunset in September?
How many hours of sunshine does Isle au Haut have in September?
What is the UV index reading in September?
Average temperature in September
Isle au Haut, ME
- Average high temperature in September: 61.7°F
The warmest month (with the highest average high temperature) is August (65.7°F).
The month with the lowest average high temperature is January (34.7°F).
- Average low temperature in September: 57.4°F
The month with the highest average low temperature is August (61.7°F).
The coldest month (with the lowest average low temperature) is January (26.1°F).
Average pressure in September
Isle au Haut, 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
Isle au Haut, ME
- Average wind speed in September: 12.1mph
The windiest month (with the highest average wind speed) is January (19.4mph).
The calmest months (with the lowest average wind speed) are July and August (10.3mph).
Average humidity in September
Isle au Haut, ME
- Average humidity in September: 82%
The months with the highest relative humidity are June, July and August (86%).
The month with the lowest relative humidity is November (74%).
Average rainfall in September
Isle au Haut, ME
- Average rainfall in September: 0.55"
The wettest months (with the highest rainfall) are October and November (1.02").
The driest months (with the least rainfall) are August and September (0.55").
Average rainfall days in September
Isle au Haut, ME
- Average rainfall days in September: 7.8 days
The month with the highest number of rainy days is July (11.6 days).
The month with the least rainy days is January (6.2 days).
Average snowfall in September
Isle au Haut, ME
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.79").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Isle au Haut, ME
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (9.1 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Isle au Haut, ME
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 24min).
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 42min).
The month with the least sunshine is December (Average sunshine: 4h and 18min).
Average sunshine days in September
Isle au Haut, ME
- Average sunshine days in September: 21.1 days
The month with the most sunshine days is August (21.2 days).
The month with the least sunshine days is February (13.5 days).
Average UV index in September
Isle au Haut, ME
- Average UV index in September: 4
The months with the highest UV index are 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
Isle au Haut, ME
- Average cloud cover in September: 31
The months with the most cloud cover are February and December (Cloud cover 54).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in September
Isle au Haut, 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).
Isle au Haut, Maine, USA
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