2025 Compare Climate & Weather:
St. Louis, MI vs Indianapolis, IN

Highlights

On average, there are 186 sunny days per year in Indianapolis. St. Louis averages 176 sunny days per year. The US average is 205 sunny days.

Indianapolis, Indiana gets 42.4 inches of rain, on average, per year. St. Louis, Michigan gets 32.9 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Indianapolis averages 21.6 inches of snow per year. St. Louis averages 42.1 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Indianapolis, Indiana
Summer High: the July high is around 84 degrees
Winter Low: the January low is 19.5
Rain: averages 42.4 inches of rain a year
Snow: averages 21.6 inches of snow a year

St. Louis, Michigan
Summer High: the July high is around 82.3 degrees
Winter Low: the January low is 14.8
Rain: averages 32.9 inches of rain a year
Snow: averages 42.1 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Indianapolis is 7.0 (10=best), which means it is about average compared to other places in Indiana.

The annual BestPlaces Comfort Index for St. Louis is 6.7 (10=best), which means it is more comfortable than most places in Michigan.

Today's Weather - St. Louis, MI

52°F

Today's Weather - Indianapolis, IN

50°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: St. Louis / Indianapolis

July is the hottest month for St. Louis with an average high temperature of 82.3°, which ranks it as warmer than most places in Michigan. In St. Louis, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for St. Louis are June, August and July.

July is the hottest month for Indianapolis with an average high temperature of 84.0°, which ranks it as about average compared to other places in Indiana. In Indianapolis, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Indianapolis are September, June and August.

January has the coldest nighttime temperatures for St. Louis with an average of 14.8°. This is about average compared to other places in Michigan.

January has the coldest nighttime temperatures for Indianapolis with an average of 19.5°. This is warmer than most places in Indiana.

In St. Louis, there are 7.7 days annually when the high temperature is over 90°, which is hotter than most places in Michigan.

In Indianapolis, there are 11.3 days annually when the high temperature is over 90°, which is cooler than most places in Indiana.

In St. Louis, there are 148.0 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Michigan.

In Indianapolis, there are 110.9 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Indiana.

In St. Louis, there are 6.4 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Michigan.

In Indianapolis, there are 4.5 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Indiana.

August is the wettest month in St. Louis with 3.4 inches of rain, and the driest month is February with 1.5 inches. The wettest season is Autumn with 29% of yearly precipitation and 16% occurs in Spring, which is the driest season. The annual rainfall of 32.9 inches in St. Louis means that it is drier than most places in Michigan.


May is the wettest month in Indianapolis with 5.1 inches of rain, and the driest month is February with 2.3 inches. The wettest season is Summer with 29% of yearly precipitation and 19% occurs in Spring, which is the driest season. The annual rainfall of 42.4 inches in Indianapolis means that it is about average compared to other places in Indiana.

April is the rainiest month in St. Louis with 10.5 days of rain, and February is the driest month with only 7.3 rainy days. There are 110.9 rainy days annually in St. Louis, which is one of the least rainy places in Michigan. The rainiest season is Winter when it rains 27% of the time and the driest is Spring with only a 23% chance of a rainy day.

May is the rainiest month in Indianapolis with 12.8 days of rain, and September is the driest month with only 7.8 rainy days. There are 122.1 rainy days annually in Indianapolis, which is rainier than most places in Indiana. The rainiest season is Summer when it rains 29% of the time and the driest is Winter with only a 22% chance of a rainy day.

An annual snowfall of 42.1 inches in St. Louis means that it is less snowy than most places in Michigan.

An annual snowfall of 21.6 inches in Indianapolis means that it is about average compared to other places in Indiana.

January is the snowiest month in St. Louis with 12.5 inches of snow, and 6 months of the year have significant snowfall.

January is the snowiest month in Indianapolis with 6.7 inches of snow, and 4 months of the year have significant snowfall.