Cumberland County · Maine
Portland, ME weather averages
NOAA climate normals for 1991-2020, measured at Portland Jetport, 4.2 km from the city centre — month by month temperature, rain and snow.
Quick answer
Portland averages a daily high of 55.8°F and a daily low of 37.2°F across the year, with 47.25 inches of precipitation. July is the warmest month at 78.8°F and January the coldest at 13.4°F.
- Average annual high
- 55.8°FWarmest month July
- Average annual low
- 37.2°FColdest month January
- Precipitation per year
- 47.25 inWettest month November
- Snowfall per year
- 61.9 in142.2 days at or below 32°F
Portland weather month by month
Normal daily high and low, precipitation and snowfall for each month, 1991-2020.
| Month | High °F | Low °F | Precip in | Snow in | Range |
|---|---|---|---|---|---|
| January | 31.2 | 13.4 | 3.38 | 19.2 | 13.4 to 31.2 degrees |
| February | 34.6 | 16.4 | 3.25 | 12.1 | 16.4 to 34.6 degrees |
| March | 42.1 | 24.9 | 4.24 | 12.7 | 24.9 to 42.1 degrees |
| April | 53.3 | 34.7 | 4.32 | 2.8 | 34.7 to 53.3 degrees |
| May | 63.5 | 44.2 | 4.01 | 0 | 44.2 to 63.5 degrees |
| June | 73.2 | 53.6 | 3.79 | 0 | 53.6 to 73.2 degrees |
| July | 78.8 | 59.4 | 3.61 | 0 | 59.4 to 78.8 degrees |
| August | 77.7 | 58.2 | 3.14 | 0 | 58.2 to 77.7 degrees |
| September | 70 | 50.3 | 3.69 | 0 | 50.3 to 70 degrees |
| October | 58.7 | 38.9 | 4.87 | 0 | 38.9 to 58.7 degrees |
| November | 48 | 30.9 | 4.93 | 1.9 | 30.9 to 48 degrees |
| December | 37.3 | 20.4 | 4.02 | 13.2 | 20.4 to 37.3 degrees |
Source: NOAA NCEI, U.S. Climate Normals 1991-2020 — station USW00014764, Portland Jetport · rates as published for 1991-2020 normals
How to read Portland climate normals
What a climate normal is, and what it is not.
A normal is the average of thirty years of daily observations at one station — here Portland Jetport, 4.2 km from the centre of Portland. It describes a typical year, so any single year will run warmer, cooler, wetter or drier. Readings taken at an airport on the edge of town usually sit a degree or two below a dense downtown on summer nights. Portland sees about 3.8 days a year at or above 90°F and about 79.5 days with a tenth of an inch of precipitation or more.
Keep going
Other Portland data on this site.