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
In Stillwater, entering September brings a subtle temperature decrement, reducing from August's warm 77.2°F (25.1°C) to a pleasant 68.9°F (20.5°C). Stillwater's average low-temperature for the month of September records at a cool 50°F (10°C).Humidity
In September, the average relative humidity is 78%.Rainfall
In Stillwater, in September, it is raining for 10.5 days, with typically 2.01" (51mm) of accumulated precipitation. Throughout the year, there are 148.7 rainfall days, and 29.84" (758mm) of precipitation is accumulated.Snowfall
In Stillwater, snow does not fall in June through September.Daylight
In Stillwater, the average length of the day in September is 12h and 31min.On the first day of September, sunrise is at 5:57 am and sunset at 7:11 pm. On the last day of the month, sunrise is at 6:32 am and sunset at 6:16 pm EDT.
Sunshine
In September, the average sunshine is 8.1h.UV index
In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for average individuals.Note: A maximum high daily UV index of 4 during September translates into the following directions:
Put precautions into practice - Protective measures against sun-induced damage are advised. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Stay sun-safe with clothing that is both closely woven and worn loosely.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Stillwater in September?
What is the average humidity in September?
How many days 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 intensity in September in Stillwater?
Average temperature in September
Stillwater, ME
- Average high temperature in September: 68.9°F
The warmest month (with the highest average high temperature) is July (78.1°F).
The month with the lowest average high temperature is January (26.6°F).
- Average low temperature in September: 50°F
The month with the highest average low temperature is July (57°F).
The coldest month (with the lowest average low temperature) is January (13.5°F).
Average pressure in September
Stillwater, 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
Stillwater, 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 (5.3mph).
Average humidity in September
Stillwater, ME
- Average humidity in September: 78%
The month with the highest relative humidity is February (86%).
The month with the lowest relative humidity is May (76%).
Average rainfall in September
Stillwater, ME
- Average rainfall in September: 2.01"
The wettest month (with the highest rainfall) is December (3.27").
The driest month (with the least rainfall) is July (1.61").
Average rainfall days in September
Stillwater, ME
- Average rainfall days in September: 10.5 days
The month with the highest number of rainy days is May (16.6 days).
The month with the least rainy days is January (8.1 days).
Average snowfall in September
Stillwater, ME
- Average snowfall in September: 0"
The month with the highest snowfall is January (8.43").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Stillwater, ME
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (13.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Stillwater, 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 54min).
The month with the least sunshine is February (Average sunshine: 3h and 54min).
Average sunshine days in September
Stillwater, ME
- Average sunshine days in September: 17.1 days
The month with the most sunshine days is September (17.1 days).
The month with the least sunshine days is April (10.1 days).
Average UV index in September
Stillwater, 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
Stillwater, ME
- Average cloud cover in September: 39
The month with the most cloud cover is February (Cloud cover 57).
The months with the least cloud cover are August and September (Cloud cover 39).
Average visibility in September
Stillwater, ME
- Average visibility in September: 5mi
The month with the highest visibility is October (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, November and December (5mi).
Stillwater, Maine, USA
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