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March Weather in South Portland, United States

Last updated: June 24, 2025

In March, the average temperature in South Portland, United States hovers around 1°C (34°F). You can expect a chilly range, with minimum temperatures plummeting to -15°C (6°F) and peaking at a moderate 13°C (56°F). Prepare for some wet days ahead, as 91 mm (3.6 in) of precipitation is likely to fall over 9 days. With an average humidity level of 82%, it’s a month that calls for cozy layers and an umbrella!

March Temperature in South Portland

In March in South Portland, the average temperature is 1°C (34°F). The maximum can reach 13°C (56°F), while the minimum can drop as low as -15°C (6°F). Be prepared for cold weather and pack warm clothing if you plan to visit during this time.

March Weather in South Portland: Daily Temperature Highs, Lows, and Averages

The chart illustrates March temperature patterns in South Portland, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In South Portland, March typically has an average temperature of 1°C (34°F), with highs reaching up to 13°C (56°F) and lows dropping to around -15°C (6°F).
JanFebMarAprMayJunJulAugSepOctNovDec282934435262686963544232
Data source: Temperature data for South Portland generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

March Precipitation in South Portland

In South Portland in March, the precipitation amount is 91 mm (3.6 in) spread over 9 days.

March Precipitation Trends in South Portland

The chart displays monthly precipitation patterns in South Portland, with values for each month alongside March’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how March’s conditions compare to those of other months. In South Portland, March typically receives around 91 mm (3.6 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec971039114994801237577163130144
Data source: Precipitation data for March generated using information from the Copernicus Climate Change Service.
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March Humidity in South Portland

In South Portland in March humidity is 82%. With an average temperature of 1°C (34°F), this humidity feels like walking through a thick fog, making it challenging to stay warm and comfortable while traveling.

March Average Humidity in South Portland

This chart illustrates the average monthly humidity levels in South Portland, with March’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In March, average humidity in South Portland is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%84%82%80%72%72%67%66%71%79%84%81%
Data source: Humidity data for March generated using information from the Copernicus Climate Change Service.

March UV Index in South Portland

In South Portland in March, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in South Portland.

Maximum UV Index Levels in South Portland for March

The chart shows the monthly maximum UV Index (UVI) for South Portland in March, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In March, the maximum UV index in South Portland typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2457910987532
Data source: South Portland March UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How March Weather in South Portland Compares to Other Months

Weather in South Portland varies notably across the year, with each month offering distinct climate conditions. This page compares March’s weather to other months in South Portland, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in South Portland, showing how March’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (28°F)97 mm (3.8 inches)86%low
February Weather-2°C (29°F)103 mm (4.1 inches)84%moderate
March Weather1°C (34°F)91 mm (3.6 inches)82%moderate
April Weather6°C (43°F)149 mm (5.9 inches)80%high
May Weather11°C (52°F)94 mm (3.7 inches)72%very high
June Weather17°C (62°F)80 mm (3.2 inches)72%very high
July Weather20°C (68°F)123 mm (4.9 inches)67%very high
August Weather20°C (69°F)75 mm (3.0 inches)66%very high
September Weather17°C (63°F)77 mm (3.0 inches)71%high
October Weather12°C (54°F)163 mm (6.4 inches)78%moderate
November Weather5°C (42°F)130 mm (5.1 inches)84%moderate
December Weather0°C (33°F)144 mm (5.7 inches)81%low

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