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 beginning of September brings a minor change in the average high-temperature, shifting from a warm 75.9°F (24.4°C) in August to a pleasant 68.9°F (20.5°C). During September, Palermo consistently records a temperature low averaging a chilly 49.3°F (9.6°C).Humidity
In September, the average relative humidity is 81%.Rainfall
September is the month with the least rainfall. Rain falls for 10.5 days and accumulates 1.61" (41mm) of precipitation.Snowfall
In Palermo, snow does not fall in June through September.Daylight
The average length of the day in September is 12h and 30min.On the first day of the month, sunrise is at 6:01 am and sunset at 7:13 pm. On the last day of September, sunrise is at 6:35 am and sunset at 6:19 pm EDT.
Sunshine
In Palermo, the average sunshine in September is 8.2h.UV index
In Palermo, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the average person.Note: In September, the maximum UV index of 4 suggests this advice:
Act with care - Obligation to protect against skin and eye damage is highlighted. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature?
What is the average humidity in September?
What is the driest month?
How much does it rain in September?
When it does not snow?
Does it snow in September?
What is the average length of the day in September?
When are sunrise and sunset in September?
How long on average sun shines in September?
What is the UV index reading in September?
Average temperature in September
Palermo, ME
- Average high temperature in September: 68.9°F
The warmest month (with the highest average high temperature) is July (76.1°F).
The month with the lowest average high temperature is January (27°F).
- Average low temperature in September: 49.3°F
The month with the highest average low temperature is July (56.8°F).
The coldest month (with the lowest average low temperature) is January (12.9°F).
Average pressure in September
Palermo, 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 (29.91"Hg).
Average wind speed in September
Palermo, ME
- Average wind speed in September: 6.1mph
The windiest month (with the highest average wind speed) is March (8.7mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).
Average humidity in September
Palermo, ME
- Average humidity in September: 81%
The months with the highest relative humidity are January, February and March (84%).
The months with the lowest relative humidity are April and November (78%).
Average rainfall in September
Palermo, ME
- Average rainfall in September: 1.61"
The wettest month (with the highest rainfall) is December (3.35").
The driest month (with the least rainfall) is September (1.61").
Average rainfall days in September
Palermo, ME
- Average rainfall days in September: 10.5 days
The month with the highest number of rainy days is June (16.1 days).
The month with the least rainy days is February (6 days).
Average snowfall in September
Palermo, ME
- Average snowfall in September: 0"
The month with the highest snowfall is January (7.8").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Palermo, ME
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (11.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Palermo, 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 1min
The month with the most sunshine is August (Average sunshine: 9h and 48min).
The month with the least sunshine is February (Average sunshine: 4h and 24min).
Average sunshine days in September
Palermo, ME
- Average sunshine days in September: 16.8 days
The months with the most sunshine days are September and November (16.8 days).
The month with the least sunshine days is April (11.3 days).
Average UV index in September
Palermo, 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, October, November and December (UV index 2).
Average cloud cover in September
Palermo, ME
- Average cloud cover in September: 39
The months with the most cloud cover are February, March and April (Cloud cover 54).
The month with the least cloud cover is September (Cloud cover 39).
Average visibility in September
Palermo, ME
- Average visibility in September: 5mi
The months with the highest visibility are November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September and October (5mi).
Palermo, Maine, USA
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