2025 Compare Climate & Weather:
Mendham township, NJ vs South Portland, ME

Highlights

On average, there are 196 sunny days per year in South Portland. Mendham township averages 206 sunny days per year. The US average is 205 sunny days.

South Portland, Maine gets 49 inches of rain, on average, per year. Mendham township, New Jersey gets 50.4 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

South Portland averages 55.8 inches of snow per year. Mendham township averages 31.4 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

South Portland, Maine
Summer High: the July high is around 78.4 degrees
Winter Low: the January low is 11
Rain: averages 49 inches of rain a year
Snow: averages 55.8 inches of snow a year

Mendham township, New Jersey
Summer High: the July high is around 83 degrees
Winter Low: the January low is 18.5
Rain: averages 50.4 inches of rain a year
Snow: averages 31.4 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for South Portland is 6.6 (10=best), which means it is one of the most pleasant places in Maine.

The annual BestPlaces Comfort Index for Mendham is 7.1 (10=best), which means it is less comfortable than most places in New Jersey.

Today's Weather - Mendham township, NJ

71°F

Today's Weather - South Portland, ME

58°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Mendham township / South Portland

July is the hottest month for Mendham with an average high temperature of 83.0°, which ranks it as cooler than most places in New Jersey. In Mendham, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Mendham are June, August and September.

July is the hottest month for South Portland with an average high temperature of 78.4°, which ranks it as cooler than most places in Maine. In South Portland, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for South Portland are July, August and June.

January has the coldest nighttime temperatures for Mendham with an average of 18.5°. This is colder than most places in New Jersey.

January has the coldest nighttime temperatures for South Portland with an average of 11.0°. This is warmer than most places in Maine.

In Mendham, there are 10.3 days annually when the high temperature is over 90°, which is cooler than most places in New Jersey.

In South Portland, there are 3.7 days annually when the high temperature is over 90°, which is hotter than most places in Maine.

In Mendham, there are 127.8 days annually when the nighttime low temperature falls below freezing, which is colder than most places in New Jersey.

In South Portland, there are 155.4 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Maine.

In Mendham, there are 1.9 days annually when the nighttime low temperature falls below zero°, which is colder than most places in New Jersey.

In South Portland, there are 11.9 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Maine.

July is the wettest month in Mendham with 5.0 inches of rain, and the driest month is February with 3.0 inches. The wettest season is Autumn with 27% of yearly precipitation and 21% occurs in Spring, which is the driest season. The annual rainfall of 50.4 inches in Mendham means that it is one of the wettest places in New Jersey.


October is the wettest month in South 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 49.0 inches in South Portland means that it is wetter than most places in Maine.

May is the rainiest month in Mendham with 11.8 days of rain, and February is the driest month with only 8.4 rainy days. There are 116.4 rainy days annually in Mendham, which is about average compared to other places in New Jersey. The rainiest season is Summer when it rains 28% of the time and the driest is Winter with only a 22% chance of a rainy day.

May is the rainiest month in South Portland with 12.4 days of rain, and February is the driest month with only 9.0 rainy days. There are 128.6 rainy days annually in South 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.

An annual snowfall of 31.4 inches in Mendham means that it is one of the snowiest places in New Jersey.

An annual snowfall of 55.8 inches in South Portland means that it is less snowy than most places in Maine.

January is the snowiest month in Mendham with 9.8 inches of snow, and 6 months of the year have significant snowfall.

January is the snowiest month in South Portland with 17.2 inches of snow, and 6 months of the year have significant snowfall.