Portland
Maine, USA
Long-term weather forecast
Long-term weather forecast

October weather forecast and climate
Portland, ME

Dusk view of the lit skyscrapers of the Portland city in Maine
Dusk view of the lit skyscrapers of the Portland city in Maine
October, like September, is another mild autumn month in Portland, Maine, with average temperature varying between 38.8°F (3.8°C) and 58.6°F (14.8°C).

Temperature

In October, the average high-temperature decreases, from an agreeable 70°F (21.1°C) in September, to a moderate 58.6°F (14.8°C). The average low-temperature, in October, is 38.8°F (3.8°C).

Humidity

In October, the average relative humidity in Portland is 73.9%.

Rainfall

In Portland, Maine, in October, during 10.5 rainfall days, 4.9" (123.7mm) of precipitation is typically accumulated. In Portland, Maine, during the entire year, the rain falls for 130.9 days and collects up to 47.3" (1200.3mm) of precipitation.

Snowfall

In Portland, it doesn't snow. In November, it regularly snows. Throughout the year, 61.9" (1572.3mm) of snow is accumulated.

Ocean temperature

In Portland, the average seawater temperature in October is 55°F (12.8°C).
Note: Swimming in 55°F (12.8°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

Daylight

In October, the average length of the day in Portland is 11h.

Sunshine

The average sunshine in October is 6.3h.

UV index

The average daily maximum UV index in Portland, Maine, is 3. A UV Index value of 3 to 5 symbolizes a moderate threat to health from the exposure to the Sun's UV radiation for the ordinary person.
Note: The average daily UV index of 3 transform into the following instructions:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.

What is the temperature in October in Portland?

The average high-temperature, in October, is 58.6°F (14.8°C), while the average low-temperature is 38.8°F (3.8°C).

What is the average humidity in October in Portland?

In Portland, the average relative humidity in October is 73.9%.

How many days does it rain in October in Portland?

In Portland, Maine, during October, the rain falls for 10.5 days and regularly aggregates up to 4.9" (123.7mm) of precipitation.

Does it snow in Portland in October?

In Portland, Maine, in October, it doesn't snow. In November, it regularly snows.

What is the water temperature in October in Portland?

In Portland, Maine, in October, the average water temperature is 55°F (12.8°C). Swimming in 55°F (12.8°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

How many hours of daylight does Portland have in October?

The average length of the day in October in Portland is 11h.

How many hours of sunshine does Portland have in October?

In Portland, Maine, the average sunshine in October is 6.3h.

What is the UV index intensity in October in Portland?

In October, the average daily maximum UV index in Portland is 3. A UV Index of 3 to 5 symbolizes a medium hazard to health from unprotected exposure to the UV radiation.
Average temperature in October - Portland, ME
  • Average high temperature in October: 58.7°F

The warmest month (with the highest average high temperature) is July (78.8°F).
The month with the lowest average high temperature is January (31.2°F).

  • Average low temperature in October: 38.9°F

The month with the highest average low temperature is July (59.4°F).
The coldest month (with the lowest average low temperature) is January (13.4°F).

Average humidity in October - Portland, ME
  • Average humidity in October: 73.9%

The month with the highest relative humidity is September (76.7%).
The month with the lowest relative humidity is February (65.2%).

Average rainfall in October - Portland, ME
  • Average rainfall in October: 4.9"

Wettest months (with the highest rainfall) are October and November (4.9").
The driest month (with the lowest rainfall) is August (3.1").

Average rainfall days in October - Portland, ME
  • Average rainfall days in October: 10.5 days

The month with the highest number of rainy days is May (12.6 days).
The month with the lowest number of rainy days is September (9.2 days).

Average snowfall in October - Portland, ME
  • Average snowfall in October: 0"

The month with the highest snowfall is January (19.2").
Months with the lowest snowfall are May, June, July, August, September and October (0").

Average snowfall days in October - Portland, ME
  • Average snowfall days in October: 0 days

The month with the highest number of snowfall days is January (7.9 days).
Months with the lowest number of snowfall days are May, June, July, August, September and October (0 days).

Average sea temperature in October - Portland, ME
  • Average sea temperature in October: 54.9°F

The best month for swimming (with the highest average sea temperature) is August (63.7°F).
The coldest month (with the lowest average sea temperature) is March (38°F).

Average daylight in October / Average sunshine in October - Portland, ME
  • Average daylight in October: 11h

The month with the longest days is June (Average daylight: 15.4h).
The month with shortest days is December (Average daylight: 9h).

  • Average sunshine in October: 6.3h

The month with most sunshine is July (Average sunshine: 9.1h).
The month with least sunshine is December (Average sunshine: 4.5h).

Average UV index in October - Portland, ME
  • Average UV index in October: 3

Months with the highest UV index are June and July (UV index 8).
Months with the lowest UV index are January and December (UV index 1).