2025 Compare Climate & Weather:
Pierre, SD vs Portland, ME

Highlights

On average, there are 203 sunny days per year in Portland. Pierre averages 217 sunny days per year. The US average is 205 sunny days.

Portland, Maine gets 48.9 inches of rain, on average, per year. Pierre, South Dakota gets 18.4 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Portland averages 61 inches of snow per year. Pierre averages 34.5 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

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

Pierre, South Dakota
Summer High: the July high is around 89.6 degrees
Winter Low: the January low is 9.4
Rain: averages 18.4 inches of rain a year
Snow: averages 34.5 inches of snow a year

BestPlaces Comfort Index

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

The annual BestPlaces Comfort Index for Pierre is 6.9 (10=best), which means it is more comfortable than most places in South Dakota.

Today's Weather - Pierre, SD

70°F

Today's Weather - Portland, ME

38°F

Average Monthly High / Low (°F)

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

July is the hottest month for Pierre with an average high temperature of 89.6°, which ranks it as one of the hottest places in South Dakota. In Pierre, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Pierre are September, June and May.

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.

January has the coldest nighttime temperatures for Pierre with an average of 9.4°. This is warmer than most places in South Dakota.

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

In Pierre, there are 41.0 days annually when the high temperature is over 90°, which is one of the hottest places in South Dakota.

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

In Pierre, there are 159.7 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in South Dakota.

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 Pierre, there are 20.2 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in South Dakota.

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

June is the wettest month in Pierre with 3.3 inches of rain, and the driest month is January with 0.4 inches. The wettest season is Autumn with 41% of yearly precipitation and 7% occurs in Spring, which is the driest season. The annual rainfall of 18.4 inches in Pierre means that it is drier than most places in South Dakota.


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.

June is the rainiest month in Pierre with 9.8 days of rain, and February is the driest month with only 3.6 rainy days. There are 73.6 rainy days annually in Pierre, which is less rainy than most places in South Dakota. The rainiest season is Autumn when it rains 33% of the time and the driest is Spring with only a 16% chance of a rainy day.

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.

An annual snowfall of 34.5 inches in Pierre means that it is less snowy than most places in South Dakota.

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

March is the snowiest month in Pierre with 6.3 inches of snow, and 7 months of the year have significant snowfall.

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