September weather forecast
Lewiston, ME

Weather in September

September, the first month of the autumn in Lewiston, is still a pleasant month, with an average temperature varying between 50.2°F (10.1°C) and 70°F (21.1°C).

Temperature

In Lewiston, Maine, the average high-temperature in September marginally drops from a warm 76.8°F (24.9°C) in August to an agreeable 70°F (21.1°C). In Lewiston, in September, the average low-temperature is 50.2°F (10.1°C).

Humidity

In September, the average relative humidity is 79%.

Rainfall

The month with the least rainfall is September, when the rain falls for 7.4 days and typically collects 0.67" (17mm) of precipitation.

Snowfall

June through September are months without snowfall in Lewiston.

Daylight

In Lewiston, Maine, the average length of the day in September is 12h and 30min.
On the first day of September in Lewiston, sunrise is at 6:04 am and sunset at 7:17 pm. On the last day of the month, sunrise is at 6:37 am and sunset at 6:23 pm EDT.

Sunshine

In Lewiston, 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 medium health hazard from exposure to the Sun's UV rays for the average person.
Note: The daily maximum UV index of 4 in September interpret into the following advice:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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.
[Resources]

FAQ

What is the temperature in September in Lewiston?

The average high-temperature, in September, in Lewiston, Maine, is 70°F (21.1°C), while the average low-temperature is 50.2°F (10.1°C).

What is the average humidity in September in Lewiston?

The average relative humidity in September is 79%.

What is the driest month in Lewiston?

September is the month with the least rainfall in Lewiston. Rain falls for 7.4 days and accumulates 0.67" (17mm) of precipitation.

How much does it rain in Lewiston in September?

In Lewiston, Maine, in September, during 7.4 rainfall days, 0.67" (17mm) of precipitation is typically accumulated.

When it does not snow in Lewiston?

In Lewiston, snow does not fall in June through September.

Does it snow in Lewiston in September?

In Lewiston, in September, it doesn't snow. In October, it regularly snows.

How many hours of daylight does Lewiston have in September?

The average day length in September in Lewiston, Maine, is 12h and 30min.

What time are sunrise and sunset in September in Lewiston?

In September, on the first day of the month, sunrise is at 6:04 am and sunset at 7:17 pm. On the last day of the month, in Lewiston, sunrise is at 6:37 am and sunset at 6:23 pm EDT.

How many hours of sunshine does Lewiston have in September?

The average sunshine duration in September is 8.5h.

What is the UV index reading in September in Lewiston?

The average daily maximum UV index in September in Lewiston is 4. A UV Index of 3 to 5 symbolizes a medium hazard to health from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Lewiston, ME

Average temperature in September - Lewiston, ME
  • Average high temperature in September: 70°F

The warmest month (with the highest average high temperature) is July (77.5°F).
The month with the lowest average high temperature is January (27°F).

  • Average low temperature in September: 50.2°F

The month with the highest average low temperature is July (57.7°F).
The coldest month (with the lowest average low temperature) is January (13.3°F).

[Resources]

Average pressure in September
Lewiston, ME

Average pressure in September - Lewiston, ME
  • Average pressure in September: 30.04"Hg

The month with the highest atmospheric pressure is November (30.05"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

[Resources]

Average wind speed in September
Lewiston, ME

Average wind speed in September - Lewiston, ME
  • Average wind speed in September: 5.4mph

The windiest month (with the highest average wind speed) is March (7.5mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).

[Resources]

Average humidity in September
Lewiston, ME

Average humidity in September - Lewiston, ME
  • Average humidity in September: 79%

The month with the highest relative humidity is February (84%).
The month with the lowest relative humidity is November (76%).

[Resources]

Average rainfall in September
Lewiston, ME

Average rainfall in September - Lewiston, ME
  • Average rainfall in September: 0.67"

The wettest month (with the highest rainfall) is October (1.69").
The driest month (with the least rainfall) is September (0.67").

[Resources]

Average rainfall days in September
Lewiston, ME

Average rainfall days in September - Lewiston, ME
  • Average rainfall days in September: 7.4 days

The month with the highest number of rainy days is July (12.7 days).
The month with the least rainy days is February (4 days).

[Resources]

Average snowfall in September
Lewiston, ME

Average snowfall in September - Lewiston, ME
  • Average snowfall in September: 0"

The month with the highest snowfall is February (4.72").
The months with the least snowfall are June, July, August and September (0").

[Resources]

Average snowfall days in September
Lewiston, ME

Average snowfall days in September - Lewiston, ME
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (8.7 days).
The months with the least snowfall days are June, July, August and September (0 days).

[Resources]

Average daylight in September /
Average sunshine in September
Lewiston, ME

Average daylight in September / Average sunshine in September - Lewiston, ME
  • Average daylight in September: 12h and 30min

The month with the longest days is June (Average daylight: 15h and 26min).
The month with the shortest days is December (Average daylight: 8h and 57min).

  • Average sunshine in September: 8h and 30min

The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).

[Resources]

Average sunshine days in September
Lewiston, ME

Average sunshine days in September - Lewiston, ME
  • Average sunshine days in September: 20 days

The month with the most sunshine days is January (20.8 days).
The month with the least sunshine days is July (16.2 days).

[Resources]

Average UV index in September
Lewiston, ME

Average UV index in September - Lewiston, ME
  • Average UV index in September: 4

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).

[Resources]

Average cloud cover in September
Lewiston, ME

Average cloud cover in September - Lewiston, ME
  • Average cloud cover in September: 36

The month with the most cloud cover is March (Cloud cover 51).
The months with the least cloud cover are August and September (Cloud cover 36).

[Resources]

Average visibility in September
Lewiston, ME

Average visibility in September - Lewiston, ME
  • Average visibility in September: 5mi

The months with the highest visibility are January, November and December (6mi).
The months with the lowest visibility are February, March, April, May, June, July, August, September and October (5mi).

[Resources]

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location
* you will be automatically redirected to the weather forecast for your location