South Portland, ME Weather & Climate Normals
South Portland's real weather, in one number
South Portland, ME scores 43/100 on this site's reading of NOAA's own 30-year normals: strongly seasonal. Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. 4 of the year's 12 months average between 55 and 75°F, the range this site counts as mild.
South Portland's hottest and coldest months
South Portland's hottest month is Jul, averaging 70°F; its coldest is Jan, averaging 20°F, a 50.1°F swing across the year, one of the widest gaps in this dataset.
South Portland's weather across the year
| Month | Avg high | Avg low | Precip |
|---|---|---|---|
| Jan | 31°F | 8°F | 3.47in |
| Feb | 34°F | 10°F | 3.36in |
| Mar | 43°F | 20°F | 4.25in |
| Apr | 56°F | 31°F | 4.69in |
| May | 67°F | 43°F | 3.8in |
| Jun | 76°F | 52°F | 4.34in |
| Jul | 82°F | 58°F | 3.97in |
| Aug | 81°F | 56°F | 3.49in |
| Sep | 73°F | 48°F | 3.92in |
| Oct | 60°F | 36°F | 5.51in |
| Nov | 48°F | 26°F | 4.39in |
| Dec | 37°F | 16°F | 4.39in |
Jun, Jul, Aug, and Sep are the best time to see South Portland at its mildest; the rest of the year, plan around Jan's cold.
Rain and snow in South Portland
Over a typical year, South Portland sees about 49.58in of precipitation a year across roughly 125 days with measurable rain or snow. That station has no snowfall reading, so none is shown rather than assumed.
Where South Portland ranks
South Portland ranks 3992 of 4876 US cities in this dataset for comfort score, and 4 of 20 within ME. About 26,994 people live there.
If you need tomorrow's forecast, not the 30-year average
Everything above is a 30-year average from West Buxton 2 Nnw, ME US, 16.8 miles from South Portland, not a prediction for any specific day.
More on how this is worked out
Why some cities show no snow or rain figure · What a 30-year climate normal actually is