Lewiston (ID) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Lewiston.
Climate overview of Lewiston
Temperatures in Lewiston, Idaho, United States of America, vary greatly throughout the year. July is the hottest month at 34°C (93°F), while December is the coldest at 5°C (41°F).
The city tends toward dry conditions, with around 341 mm (13 in) of rain/snowfall per year. It does, however, have a distinct dry season from April to February.
Lewiston Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Lewiston — and find the best time to visit.
Monthly Temperature in Lewiston
The climate in Lewiston is known for significant temperature differences throughout the year, making the weather dynamic. Typically, average maximum daytime temperatures range from a very warm 34°C (93°F) in July to a chilly 5°C (41°F) in the coolest month, December.
Nights vary from 16°C (61°F) in July to around -1°C (30°F) during the colder months.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Lewiston
Lewiston has a relatively dry climate with low precipitation, averaging 341 mm (13 in) of rain/snowfall annually. The climate in Lewiston shows significant variation throughout the year. Expect moderate rainfall in March, the wettest month, with an average of 44 mm (1.7 in) of precipitation over 17 rainy days.
In contrast, the driest month July offers drier and sunnier days, with around 11 mm (0.4 in) of rainfall over 4 rainy days. For more details, please visit our Lewiston Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Best Time to Visit Lewiston
Frequently asked questions about the climate in Lewiston
What is the best time to visit Lewiston?
May, June, September and October typically offer the most optimal weather in Lewiston. In contrast, January, July, November and December tend to have less optimal conditions. Lewiston has a distinct dry season from April to February.
What temperatures can I expect in Lewiston?
Daytime highs range from 5°C (41°F) in December to 34°C (93°F) in July. Nighttime lows range from -1°C (30°F) to 16°C (61°F). Temperatures vary considerably through the year.
How much rain does Lewiston get?
Annual rainfall is around 341 mm (13 in). March is the wettest month with 44 mm (1.7 in), while July is the driest with 11 mm (0.4 in).
Lewiston 3-Day Forecast
Lewiston (ID) 3-Day Forecast
Lewiston on the map
Lewiston is highlighted — select any city to see its climate.
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