Climateby Month

Portland vs Lewiston weather

Portland, ME and Lewiston, ME · 30 mi apart

July highs: 80°F in Portland, 79°F in Lewiston (Portland is 1°F warmer). January highs: 32°F and 29°F (Portland is 3°F warmer). Portland has about 131 wet days a year, Lewiston about 140. Muggy days: about 16 a year in Portland, about 13 in Lewiston. Snow: 68.7 in a year in Portland, 77.5 in in Lewiston.

Portland, ME

0°20°40°60°80° January: normal high 32°F (0°C), low 16°F (-9°C) 32° 16° February: normal high 35°F (2°C), low 17°F (-8°C) March: normal high 42°F (6°C), low 26°F (-3°C) April: normal high 54°F (12°C), low 35°F (2°C) May: normal high 64°F (18°C), low 46°F (8°C) June: normal high 74°F (23°C), low 55°F (13°C) July: normal high 80°F (27°C), low 61°F (16°C) 80° 61° August: normal high 79°F (26°C), low 60°F (16°C) September: normal high 71°F (22°C), low 52°F (11°C) October: normal high 60°F (16°C), low 41°F (5°C) November: normal high 48°F (9°C), low 32°F (0°C) December: normal high 38°F (3°C), low 22°F (-6°C) JFMAMJJASOND

Best months: June, September

Lewiston, ME

0°20°40°60°80° January: normal high 29°F (-2°C), low 8°F (-13°C) 29° 8° February: normal high 33°F (1°C), low 9°F (-13°C) March: normal high 41°F (5°C), low 19°F (-7°C) April: normal high 54°F (12°C), low 30°F (-1°C) May: normal high 65°F (18°C), low 40°F (4°C) June: normal high 74°F (23°C), low 50°F (10°C) July: normal high 79°F (26°C), low 56°F (13°C) 79° 56° August: normal high 78°F (26°C), low 54°F (12°C) September: normal high 70°F (21°C), low 47°F (8°C) October: normal high 58°F (14°C), low 36°F (2°C) November: normal high 46°F (8°C), low 27°F (-3°C) December: normal high 35°F (2°C), low 16°F (-9°C) JFMAMJJASOND

Best months: May, June, September

Which city for what

  • Milder winters: Portland (January high 32°F vs January high 29°F)
  • Less snow: Portland (68.7 in vs 77.5 in)

Listed only where the difference is at least 3°F in highs, 10 days a year or 3 in of snow.

Season by season

SeasonAvg high PortlandAvg high LewistonWet days PortlandWet days Lewiston
Winter (Dec-Feb)35°F32°F3434
Spring (Mar-May)53°F54°F3536
Summer (Jun-Aug)77°F77°F3237
Fall (Sep-Nov)60°F58°F3133

Side by side over a year

PortlandLewiston
Hot days (90°F+)54
Freezing nights144176
Muggy days1613
Comfortable days7680
Precipitation48.1 in49.7 in
Snowfall68.7 in77.5 in
Frost dateslast Apr 26, first Oct 15last Apr 25, first Oct 19
Daylight in June / December15.4 h / 9.0 h15.4 h / 8.9 h
Best monthsJune, SeptemberMay, June, September

Day counts from each city's daily records, 1991-2020. Comfortable days: highs 65-80°F and dew point under 60°F.

Month by month

MonthHigh PortlandHigh LewistonWet days PortlandWet days Lewiston
January32°F29°F1111
February35°F33°F1010
March42°F41°F1111
April54°F54°F1112
May64°F65°F1313
June74°F74°F1214
July80°F79°F1112
August79°F78°F911
September71°F70°F910
October60°F58°F1112
November48°F46°F1111
December38°F35°F1213

Both charts use the same temperature scale.

Where the numbers come from

  • Portland, ME: temperature from Portland Intl Jetport (USW00014764), 2.4 mi WSW of the city center; precipitation from Portland Intl Jetport (USW00014764). NOAA 1991-2020 normals and daily records.
  • Lewiston, ME: temperature from Durham (USC00172048), 9.1 mi SE of the city center; precipitation from Durham (USC00172048). NOAA 1991-2020 normals and daily records.

Every station for each city, including humidity and frost, is listed on the city page. Methodology.