Maine · NWS GYX office

South Portland, ME weather

It is 28°F and clear at Portland, Portland International Jetport as of Oct 28, 5:05 AM EDT. Overnight: Mostly Clear, low near 27°F. Forecast from the National Weather Service, issued Oct 28, 2:31 AM EDT.

Updated Oct 28, 5:26 AM EDT (snapshot)

Current conditions

Temperature

28°F

Clear

Wind

Calm

Humidity 74% · dew point 21°F

Pressure · visibility

30.50 inHg

Visibility 10 mi

Observed at Portland, Portland International Jetport (KPWM), Oct 28, 5:05 AM EDT. Station readings can lag or be missing.

Alerts for this area

No active NWS alerts cover the South Portland forecast zone right now.

Around the NWS GYX forecast area

No active alerts in zones served by the GYX office near South Portland.

From the alert snapshot of Oct 28, 2026, 5:12 AM EDT. No alerts are active anywhere in Maine.

For official warnings, check weather.gov and your local authorities. OpenForecast repeats National Weather Service alerts and may be delayed or incomplete. Follow instructions from emergency officials.

Next 24 hours

Hourly forecast for South Portland (local time)
TimeTempForecastPrecip. chanceWind
Wed 5 AM29°FMostly Clear0%N 5 mph
Wed 6 AM27°FSunny0% 0 mph
Wed 7 AM27°FSunny0% 0 mph
Wed 8 AM28°FMostly Sunny0% 0 mph
Wed 9 AM33°FMostly Sunny1% 0 mph
Wed 10 AM38°FMostly Sunny1% 0 mph
Wed 11 AM43°FMostly Sunny1% 0 mph
Wed 12 PM45°FMostly Sunny1%S 5 mph
Wed 1 PM47°FMostly Sunny2%S 5 mph
Wed 2 PM48°FPartly Sunny1%S 5 mph
Wed 3 PM50°FPartly Sunny1%S 5 mph
Wed 4 PM52°FPartly Sunny2%S 5 mph
Wed 5 PM52°FPartly Sunny2%S 5 mph
Wed 6 PM48°FPartly Cloudy2%S 5 mph
Wed 7 PM45°FPartly Cloudy2%SW 5 mph
Wed 8 PM41°FPartly Cloudy4%SW 5 mph
Wed 9 PM41°FMostly Clear5%SW 5 mph
Wed 10 PM40°FMostly Clear6%SW 5 mph
Wed 11 PM39°FMostly Clear4%SW 5 mph
Thu 12 AM38°FMostly Clear4%SW 5 mph
Thu 1 AM38°FMostly Clear4%SW 5 mph
Thu 2 AM38°FMostly Clear3%SW 5 mph
Thu 3 AM38°FMostly Clear2%SW 5 mph
Thu 4 AM38°FMostly Clear2%SW 5 mph

Hourly values come from the NWS gridded forecast for the 2.5 km grid square that covers the city's center point. Conditions elsewhere in South Portland can differ.

7-day forecast

Overnight

Low 27°F

Mostly clear, with a low around 27. North wind around 5 mph.

Wednesday

High 52°F·Low 38°F

Mostly sunny, with a high near 52. Northeast wind 0 to 5 mph.

Wednesday Night: Mostly clear, with a low around 38. Southwest wind around 5 mph.

Thursday

High 66°F·Low 51°F

Sunny, with a high near 66. Southwest wind 5 to 10 mph, with gusts as high as 25 mph.

Thursday Night: Partly cloudy, with a low around 51. Southwest wind 5 to 10 mph, with gusts as high as 25 mph.

Friday

High 66°F·Low 35°F

Sunny, with a high near 66.

Friday Night: Mostly clear, with a low around 35.

Saturday

High 53°F·Low 27°F

Sunny, with a high near 53.

Saturday Night: Mostly clear, with a low around 27.

Sunday

High 58°F·Low 36°F

Sunny, with a high near 58.

Sunday Night: Partly cloudy, with a low around 36.

Monday

High 62°F·Low 37°F

A slight chance of rain showers after noon. Mostly sunny, with a high near 62.

Monday Night: A slight chance of rain showers. Mostly cloudy, with a low around 37.

Tuesday

High 56°F

A slight chance of rain showers. Partly sunny, with a high near 56.

Nearby cities

Larger cities in the area

Other cities in Cumberland County

See every city we cover in Maine, or check all active alerts.

About this forecast

Forecast office
South Portland is served by the National Weather Service GYX forecast office, forecast zone MEZ024, county zone MEC005.
Location used
The Census Bureau's internal point for South Portland (43.6314, -70.2860), in Cumberland County. Population: 26,994 (2024 estimate), number 4 of the 9 Maine cities on this site.
Radar
Nearest NWS radar: KGYX. View it on radar.weather.gov.

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Sources

  • Forecast, hourly forecast, observations and alerts: National Weather Service API, api.weather.gov/points/43.6314,-70.286 (forecast issued Oct 28, 2:31 AM EDT).
  • Official forecast page: forecast.weather.gov.
  • City location and population: U.S. Census Bureau, Vintage 2024 population estimates and 2024 Gazetteer files.
  • Snapshot taken Oct 28, 2026. The NWS and Census Bureau do not endorse OpenForecast.

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