2025 Compare Climate & Weather:
Mosier, OR vs Lewiston, ID

Highlights

On average, there are 169 sunny days per year in Lewiston. Mosier averages 176 sunny days per year. The US average is 205 sunny days.

Lewiston, Idaho gets 15.8 inches of rain, on average, per year. Mosier, Oregon gets 20.5 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Lewiston averages 12.5 inches of snow per year. Mosier averages 15.5 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Lewiston, Idaho
Summer High: the July high is around 88.3 degrees
Winter Low: the January low is 28.5
Rain: averages 15.8 inches of rain a year
Snow: averages 12.5 inches of snow a year

Mosier, Oregon
Summer High: the July high is around 85.7 degrees
Winter Low: the January low is 30.2
Rain: averages 20.5 inches of rain a year
Snow: averages 15.5 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Lewiston is 7.2 (10=best), which means it is one of the most pleasant places in Idaho.

The annual BestPlaces Comfort Index for Mosier is 7.4 (10=best), which means it is more comfortable than most places in Oregon.

Today's Weather - Mosier, OR

50°F

Today's Weather - Lewiston, ID

51°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Mosier / Lewiston

August is the hottest month for Mosier with an average high temperature of 85.9°, which ranks it as warmer than most places in Oregon. In Mosier, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Mosier are June, September and May.

July is the hottest month for Lewiston with an average high temperature of 88.3°, which ranks it as warmer than most places in Idaho. In Lewiston, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Lewiston are September, June and May.

December has the coldest nighttime temperatures for Mosier with an average of 29.5°. This is colder than most places in Oregon.

December has the coldest nighttime temperatures for Lewiston with an average of 27.1°. This is one of the warmest places in Idaho.

In Mosier, there are 30.2 days annually when the high temperature is over 90°, which is hotter than most places in Oregon.

In Lewiston, there are 36.8 days annually when the high temperature is over 90°, which is hotter than most places in Idaho.

In Mosier, there are 77.7 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Oregon.

In Lewiston, there are 88.5 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in Idaho.

In Mosier, there are 0.3 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Oregon.

In Lewiston, there are 0.9 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in Idaho.

December is the wettest month in Mosier with 4.0 inches of rain, and the driest month is July with 0.2 inches. The wettest season is Spring with 50% of yearly precipitation and 5% occurs in Autumn, which is the driest season. The annual rainfall of 20.5 inches in Mosier means that it is drier than most places in Oregon.


November is the wettest month in Lewiston with 1.8 inches of rain, and the driest month is July with 0.7 inches. The wettest season is Summer with 31% of yearly precipitation and 17% occurs in Autumn, which is the driest season. The annual rainfall of 15.8 inches in Lewiston means that it is about average compared to other places in Idaho.

November is the rainiest month in Mosier with 16.0 days of rain, and July is the driest month with only 1.8 rainy days. There are 109.9 rainy days annually in Mosier, which is less rainy than most places in Oregon. The rainiest season is Spring when it rains 40% of the time and the driest is Autumn with only a 8% chance of a rainy day.

November is the rainiest month in Lewiston with 12.8 days of rain, and August is the driest month with only 4.2 rainy days. There are 110.4 rainy days annually in Lewiston, which is rainier than most places in Idaho. The rainiest season is Spring when it rains 30% of the time and the driest is Autumn with only a 16% chance of a rainy day.

An annual snowfall of 15.5 inches in Mosier means that it is snowier than most places in Oregon.

An annual snowfall of 12.5 inches in Lewiston means that it is one of the least snowy places in Idaho.

January is the snowiest month in Mosier with 5.2 inches of snow, and 5 months of the year have significant snowfall.

December is the snowiest month in Lewiston with 4.5 inches of snow, and 5 months of the year have significant snowfall.