South Portland, ME Weather Forecast for 5-Days

Updated: Sun May 10th 2026 7:00 AM EDT

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South Portland, ME Weather – 5-10 – Scattered Showers
58° / 46°
Scattered Showers
South Portland may see passing showers, with daytime highs of 58°F and overnight lows near 46°F. The chance of rain is 87% with an estimated 0.02in. Wind will be moderate, blowing around 14mph on average and gusts of 19.7mph at 8 AM. High humidity with average of 92% is anticipated, the maximum being 98% at 10 AM and 67% being its lowest at 10 PM. Barometric pressure is its highest of 29.99inHg at 11 PM, a lowest point of 29.89inHg at 3 PM with an avg 29.92inHg.
South Portland, ME Weather – 5-11 – Scattered Showers
53° / 48°

Weather Tomorrow

Scattered Showers
In South Portland, on and off showers are set to occur with highs near 53°F and lows around 48°F. The chance of rain is 89% with an estimated 0.03in. Wind will be moderate, blowing around 12mph on average and gusts of 17.4mph at 11 PM. The humidity will be on the higher side, averaging about 76%, the maximum being 92% at 2 AM and 61% being its lowest at 12 PM. Barometric pressure is its highest of 30.03inHg at 11 PM, a lowest point of 29.95inHg at 6 PM with an avg 29.99inHg.
South Portland, ME Weather – 5-12 – Sunny
57° / 42°
Sunny
In South Portland, a sunny day is likely with a high near 57°F and a low around 42°F. Wind will be moderate, blowing around 12mph on average and gusts of 18.3mph at 12 AM. Humidity levels should be comfortable, sitting around 53% on average, the maximum being 68% at 5 AM and 38% being its lowest at 2 PM. Barometric pressure is its highest of 30.15inHg at 10 PM, a lowest point of 30.03inHg at 4 PM with an avg 30.07inHg.
South Portland, ME Weather – 5-13 – Partly Cloudy
52° / 43°
Partly Cloudy
Cloudy skies are in the forecast for South Portland, with a high of 52°F and a low of 43°F. Wind will be moderate, blowing around 19mph on average and gusts of 29.3mph at 10 PM. Humidity levels should be comfortable, sitting around 59% on average, the maximum being 77% at 11 PM and 48% being its lowest at 10 AM. Barometric pressure is its highest of 30.25inHg at 10 AM, a lowest point of 30.06inHg at 9 PM with an avg 30.19inHg.
South Portland, ME Weather – 5-14 – Moderate Rain
52° / 48°
Moderate Rain
Daytime highs will reach 52°F with lows dropping to 48°F in South Portland, where it will rain at times. The chance of rain is 86% with an estimated 0.33in. Wind will be moderate, blowing around 17mph on average and gusts of 26.2mph at 12 AM. High humidity with average of 89% is anticipated, the maximum being 98% at 10 PM and 73% being its lowest at 11 AM. Barometric pressure is its highest of 30.18inHg at 8 AM, a lowest point of 29.93inHg at 1 PM with an avg 30.06inHg.
South Portland, ME Weather – 5-15 – Scattered Showers
52° / 48°
Scattered Showers
Showers likely at times in South Portland, with a high of 52°F and a low of 48°F. Rainfall predicted to have a 74% chance with an estimated 0.05in. Winds will be light at 9mph and gusts of 13.2mph at 12 AM. High humidity with average of 97% is anticipated, the maximum being 99% at 9 AM and 93% being its lowest at 5 PM. Barometric pressure is its highest of 30.03inHg at 12 AM, a lowest point of 29.85inHg at 8 PM with an avg 29.91inHg.

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