2025 Compare Climate & Weather:
Portland, ME vs Mystic, CT

Highlights

On average, there are 203 sunny days per year in Mystic. Portland averages 203 sunny days per year. The US average is 205 sunny days.

Mystic, Connecticut gets 47.9 inches of rain, on average, per year. Portland, Maine gets 48.9 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Mystic averages 26.7 inches of snow per year. Portland averages 61 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Mystic, Connecticut
Summer High: the July high is around 79.6 degrees
Winter Low: the January low is 21.7
Rain: averages 47.9 inches of rain a year
Snow: averages 26.7 inches of snow a year

Portland, Maine
Summer High: the July high is around 78.8 degrees
Winter Low: the January low is 10.8
Rain: averages 48.9 inches of rain a year
Snow: averages 61 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Mystic is 7.1 (10=best), which means it is more comfortable than most places in Connecticut.

The annual BestPlaces Comfort Index for Portland is 6.5 (10=best), which means it is more comfortable than most places in Maine.

Today's Weather - Portland, ME

47°F

Today's Weather - Mystic, CT

55°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Portland / Mystic

July is the hottest month for Portland with an average high temperature of 78.8°, which ranks it as about average compared to other places in Maine. In Portland, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Portland are August, July and June.

July is the hottest month for Mystic with an average high temperature of 79.6°, which ranks it as one of the coolest places in Connecticut. In Mystic, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Mystic are August, July and June.

January has the coldest nighttime temperatures for Portland with an average of 10.8°. This is warmer than most places in Maine.

January has the coldest nighttime temperatures for Mystic with an average of 21.7°. This is one of the warmest places in Connecticut.

In Portland, there are 3.8 days annually when the high temperature is over 90°, which is hotter than most places in Maine.

In Mystic, there are 1.7 days annually when the high temperature is over 90°, which is one of the coolest places in Connecticut.

In Portland, there are 154.5 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Maine.

In Mystic, there are 106.4 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Connecticut.

In Portland, there are 12.2 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Maine.

In Mystic, there are 0.9 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Connecticut.

November is the wettest month in Portland with 5.0 inches of rain, and the driest month is August with 3.3 inches. The wettest season is Winter with 28% of yearly precipitation and 22% occurs in Spring, which is the driest season. The annual rainfall of 48.9 inches in Portland means that it is about average compared to other places in Maine.


March is the wettest month in Mystic with 4.7 inches of rain, and the driest month is February with 3.1 inches. The wettest season is Summer with 27% of yearly precipitation and 22% occurs in Spring, which is the driest season. The annual rainfall of 47.9 inches in Mystic means that it is drier than most places in Connecticut.

May is the rainiest month in Portland with 12.4 days of rain, and February is the driest month with only 9.2 rainy days. There are 128.3 rainy days annually in Portland, which is about average compared to other places in Maine. The rainiest season is Summer when it rains 27% of the time and the driest is Spring with only a 24% chance of a rainy day.

May is the rainiest month in Mystic with 11.7 days of rain, and February is the driest month with only 9.0 rainy days. There are 120.5 rainy days annually in Mystic, which is rainier than most places in Connecticut. The rainiest season is Summer when it rains 28% of the time and the driest is Autumn with only a 24% chance of a rainy day.

An annual snowfall of 61.0 inches in Portland means that it is less snowy than most places in Maine.

An annual snowfall of 26.7 inches in Mystic means that it is less snowy than most places in Connecticut.

January is the snowiest month in Portland with 18.1 inches of snow, and 6 months of the year have significant snowfall.

February is the snowiest month in Mystic with 7.8 inches of snow, and 6 months of the year have significant snowfall.