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

March 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
March, the first month of the spring, in Portland, is still a cold month, with average temperature varying between 42.1°F (5.6°C) and 25°F (-3.9°C).

Temperature

In Portland, Maine, the average high-temperature slightly increases, from 34.5°F (1.4°C) in February, to a still cold 42.1°F (5.6°C). The average low-temperature, in March, is 25°F (-3.9°C).

Humidity

In March, the average relative humidity in Portland is 66.3%.

Rainfall

In Portland, in March, during 11.7 rainfall days, 4.2" (107.7mm) of precipitation is typically accumulated. In Portland, during the entire year, the rain falls for 130.9 days and collects up to 47.3" (1200.3mm) of precipitation.

Snowfall

Months with snowfall are January through April, November and December.

Ocean temperature

March is the month with the coldest seawater in Portland, with an average ocean temperature of 37.9°F (3.3°C).
Note: For swimming, this is considered very dangerous and immediately life-threatening. Total loss of breathing control instantly occurs, and clear thinking becomes almost impossible. A specialized swimsuit is obligatory to minimize thermal loss.

Daylight

In Portland, the average length of the day in March is 12h.

Sunshine

The average sunshine in Portland is 6.6h.

UV index

In Portland, the average daily maximum UV index in March is 3. A UV Index of 3 to 5 symbolizes a moderate health risk from the exposure to the Sun's UV radiation for the ordinary person.
Note: The daily maximum UV index of 3 in March interpret into the following advice:
Take precautions - Protection against the skin and eye damage is obliged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the temperature in March in Portland?

In March, in Portland, the average high-temperature is 42.1°F (5.6°C), and the average low-temperature is 25°F (-3.9°C).

What is the average humidity in March in Portland?

In March, the average relative humidity in Portland, Maine, is 66.3%.

How many days does it rain in March in Portland?

In March, in Portland, the rain falls for 11.7 days. Throughout March, 4.2" (107.7mm) of precipitation is accumulated.

How much does it snow in Portland in March?

In Portland, during March, snow falls for 5.1 days and regularly aggregates up to 12.7" (322.6mm) of snow.

What is the month with the coldest ocean in Portland?

March is the month with the coldest seawater in Portland, with an average ocean temperature of 37.9°F (3.3°C).

How cold is the water in March in Portland?

In March, the average ocean temperature in Portland, Maine, is 37.9°F (3.3°C). For swimming, this is considered life-threatening and very dangerous. The water feels painfully cold, and hyperventilation quickly occurs. A specialized swimsuit is mandatory to reduce thermal damage.

What is the average length of the day in March in Portland?

In March, the average length of the day is 12h.

How long on average sun shines in March in Portland?

In March, the average sunshine in Portland is 6.6h.

What is the UV index intensity in March in Portland?

In March, the average daily maximum UV index is 3. A UV Index reading of 3 to 5 represents a medium health risk from the exposure to the Sun's UV rays.
Average temperature in March - Portland, ME
  • Average high temperature in March: 42.1°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 March: 24.9°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 March - Portland, ME
  • Average humidity in March: 66.3%

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 March - Portland, ME
  • Average rainfall in March: 4.2"

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 March - Portland, ME
  • Average rainfall days in March: 11.7 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 March - Portland, ME
  • Average snowfall in March: 12.7"

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 March - Portland, ME
  • Average snowfall days in March: 5.1 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 March - Portland, ME
  • Average sea temperature in March: 38°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 March / Average sunshine in March - Portland, ME
  • Average daylight in March: 12h

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 March: 6.6h

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 March - Portland, ME
  • Average UV index in March: 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).