Current Conditions

South Portland, Maine

62°F17°C
Cloudy

Wind

ENE 5 mph7 km/h

Humidity

96%

Cloud Cover

70%

As of Wednesday, September 2, 2026 at 3:03 AM EDT

Today's Outlook

Day

Overcast and mild, with a high of 65°F18°C. Breezy from the ESE at 7 to 8 mph12 to 13 km/h.

Night

Overcast, with a low around 62°F16°C. Breezy from the ESE at 7 to 9 mph12 to 14 km/h.

7-Day Forecast

DayConditionHigh (°F)Low (°F)Precip (mm)Cloud Cover (%)Wind (mph)
CloudyHigh 65°F18°CLow 61°F16°CPrecip 0.01 in0.2 mm9%Cloud 89%Wind ESE 7 mph12 km/hWednesday: Overcast and mild, with a high of 65°F18°C. Breezy from the ESE at 7 to 8 mph12 to 13 km/h. Wednesday Night: Overcast, with a low around 62°F16°C. Breezy from the ESE at 7 to 9 mph12 to 14 km/h.
RainHigh 68°F20°CLow 64°F18°CPrecip 0.81 in20.5 mm100%Cloud 88%Wind SSE 8 mph12 km/hThursday: Overcast and mild, with a high of 68°F20°C. Breezy from the SSE at 8 to 10 mph13 to 16 km/h. 100% chance of rain throughout the day. Thursday Night: Overcast, with a low around 64°F18°C. Breezy from the SSE at 8 to 12 mph12 to 19 km/h. 96% chance of rain overnight.
DrizzleHigh 71°F22°CLow 63°F17°CPrecip 0.04 in1 mm35%Cloud 49%Wind NW 6 mph9 km/hFriday: Partly cloudy and warm, with a high of 71°F22°C and morning low of 64°F18°C. Light wind from the WNW around 5 mph8 km/h. 35% chance of drizzle in the afternoon. Friday Night: Mostly cloudy, with a low around 63°F17°C. Breezy from the NW at 7 to 11 mph11 to 17 km/h. 12% chance of drizzle in the evening.
DrizzleHigh 67°F19°CLow 62°F16°CPrecip 0.05 in1.2 mm23%Cloud 56%Wind N 14 mph22 km/hSaturday: Mostly cloudy and mild, with a high of 67°F19°C. Breezy from the N at 14 to 15 mph23 to 24 km/h. 22% chance of drizzle in the afternoon. Saturday Night: Partly cloudy, with a low around 62°F16°C. Breezy from the N at 13 to 15 mph21 to 24 km/h. 23% chance of drizzle in the evening.
DrizzleHigh 68°F20°CLow 59°F15°CPrecip 0.03 in0.8 mm20%Cloud 49%Wind N 13 mph22 km/hSunday: Mostly cloudy and mild, with a high of 68°F20°C and morning low of 59°F15°C. Windy from the N at 14 to 16 mph23 to 26 km/h. Sunday Night: Partly cloudy, with a low around 59°F15°C. Breezy from the N at 13 to 15 mph20 to 25 km/h. 20% chance of drizzle overnight.
ClearHigh 70°F21°CLow 59°F15°CPrecip 0 in0 mmCloud 18%Wind NW 8 mph13 km/hMonday: Mostly clear and warm, with a high of 70°F21°C and morning low of 60°F16°C. Breezy from the NW at 7 to 9 mph12 to 14 km/h. Monday Night: Mostly clear, with a low around 59°F15°C. Breezy from the NW at 9 to 10 mph15 to 17 km/h.
Partly CloudyHigh 69°F21°CLow 62°F17°CPrecip 0.01 in0.3 mm7%Cloud 43%Wind WNW 8 mph13 km/hTuesday: Partly cloudy and warm, with a high of 69°F21°C and morning low of 62°F17°C. Breezy from the WNW at 8 mph13 km/h. Tuesday Night: Partly cloudy, with a low around 62°F17°C. Breezy from the WNW at 8 to 9 mph14 to 14 km/h.

15-Day Forecast

Day High Low Precip Cloud Cover Condition Wind
WednesdaySep 265°F18°C61°F16°C0.01 in0.2 mm· 9%89%CloudyESE 7 mph12 km/h
ThursdaySep 368°F20°C64°F18°C0.81 in20.5 mm· 100%88%RainSSE 8 mph12 km/h
FridaySep 471°F22°C63°F17°C0.04 in1 mm· 35%49%DrizzleNW 6 mph9 km/h
SaturdaySep 567°F19°C62°F16°C0.05 in1.2 mm· 23%56%DrizzleN 14 mph22 km/h
SundaySep 668°F20°C59°F15°C0.03 in0.8 mm· 20%49%DrizzleN 13 mph22 km/h
MondaySep 770°F21°C59°F15°C0 in0 mm· —18%ClearNW 8 mph13 km/h
TuesdaySep 869°F21°C62°F17°C0.01 in0.3 mm· 7%43%Partly CloudyWNW 8 mph13 km/h
WednesdaySep 967°F19°C61°F16°C0.04 in1 mm· 16%69%DrizzleSSW 9 mph15 km/h
ThursdaySep 1072°F22°C65°F19°C0.09 in2.2 mm· 19%62%DrizzleWSW 12 mph19 km/h
FridaySep 1169°F21°C64°F18°C0.08 in2.1 mm· 13%52%DrizzleW 11 mph17 km/h
SaturdaySep 1267°F19°C62°F16°C0.11 in2.9 mm· 16%52%DrizzleWSW 10 mph16 km/h
SundaySep 1367°F20°C62°F17°C0.11 in2.8 mm· 20%60%DrizzleSW 10 mph17 km/h
MondaySep 1467°F20°C62°F17°C0.14 in3.6 mm· 23%56%ShowersWSW 10 mph16 km/h
TuesdaySep 1567°F19°C61°F16°C0.11 in2.7 mm· 14%50%DrizzleWSW 10 mph16 km/h
WednesdaySep 1666°F19°C60°F16°C0.07 in1.7 mm· 9%43%Partly CloudyWSW 10 mph16 km/h

Nearby Cities

About This Forecast

This forecast is powered by WeatherMesh, the world's most advanced and accurate weather model powered by AI. WeatherMesh is built on proprietary data from WindBorne's Global Sounding Balloon constellation — the world's largest fleet of autonomous, long-duration weather balloons — collecting observations across 100% of Earth, including over oceans and remote regions where no other data exists.

WeatherMesh consistently outperforms legacy models in independent benchmarks. View Benchmarks →

Access WeatherMesh forecasts programmatically via our API. API Documentation →

How to Access Weather Forecasts

PatternExampleDescription
/weather/{country}/{city}//weather/united-states/san-francisco/City forecast (canonical URL)
/weather/{city}//weather/tokyo/Shorthand — redirects to most populous match
/weather/{country}/{region}/{city}//weather/united-states/california/san-francisco/With region — redirects to canonical
/weather/nearby?lat={lat}&lon={lon}/weather/nearby?lat=48.1&lon=11.5Find nearest city by coordinates
/weather/{country}//weather/germany/Country index — all cities by region

Country and city names use lowercase slugs with hyphens (e.g. united-states, san-francisco). Arbitrary city names are supported — if not in our database, we geocode the name and serve the forecast for that location.

For programmatic access, use theWindBorne Forecast APIwhich returns structured JSON for any coordinates worldwide.

Coordinates: 43.6415°N, 70.2409°W·Elevation: 7m·Timezone: America/New_York·Population: 25,556