Portland, Maine weather in March
Temperature, sea and sunshine in March: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in March
Poor
Best time to visit: July – August
What is the weather like in Portland, Maine in March?
In March, Portland, Maine is cold: daytime highs average 5 °C, and nights often drop below freezing (−3 °C). The sea averages 3.7 °C – swimming is only for the hardy. Expect around 6 hours of sunshine a day. Rain is frequent, with about 10 rainy days and 102 mm in total. Snow falls on about 4 days. All in all, March is not an ideal month for a holiday in Portland, Maine.
March compared
How the weather changes from February to April. Tap a month to open it.
| FebruaryFeb | MarchMar | AprilApr | |
|---|---|---|---|
| Score | 21 | 22 | 23 |
| Day | 1° | 5° | 10° |
| Night | −7° | −3° | 3° |
| Sea | 4° | 4° | 6° |
| Sun | 5 h | 6 h | 7 h |
| Rain days | 9 | 10 | 11 |
More details for March
- Daylight
- 11 h 51 min06:55 – 18:46
- UV index
- 4 · moderateclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 21 km/haverage daily peakAll months
- Cloud cover
- 58 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Snow days
- 4 days1 cm or more of fresh snowAll months
- Time zone
- UTC−4America/New_York
How the score comes together
- Temperatureweight 35 %0 %
- Seaweight 25 %0 %
- Sunshineweight 20 %53 %
- Few rainy daysweight 20 %56 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in March
- Sunscreen
- Warm jacket
- Hat, scarf & gloves
- Rain jacket or umbrella
Portland, Maine in March: quick answers
Is Portland, Maine hot in March?
No. In March, Portland, Maine is cold: daytime highs average 5 °C and nights drop to about −3 °C.
Can you swim in Portland, Maine in March?
Only if you don't mind cold water: in March the sea averages just 3.7 °C. Comfortable swimming temperatures are not reached at any time of year.
Does it rain much in Portland, Maine in March?
Rain is frequent, with about 10 rainy days and 102 mm in total.
Portland, Maine month by month
The whole year in Portland, MaineAll destinations: USAWhere to go in MarchSea temperature in March
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences