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Lewiston

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Lewiston Weather, Climate and Best Time to Visit

Data source：Meteostat
Update date：2025-09

Lewiston year round climate

  • Spring (March–May): Average 34–56°F, with fluctuating temperatures and relatively high rainfall, particularly in March and April. Common activities: Outdoor walks (be mindful of changing weather), flower viewing (if available). Recommended clothing: Warm jacket, waterproof clothing, layers.
  • Summer (June–August): Average 63–71°F, warm and humid, with relatively high rainfall; August is the rainiest month. Common activities: Outdoor picnics, hiking (sun and rain protection needed), lakeside activities. Recommended clothing: Lightweight and breathable clothing, rain gear, sun hat.
  • Autumn (September–November): Average 60–39°F, gradually decreasing temperatures and relatively even rainfall. Common activities: Fall foliage viewing (if available), hiking. Recommended clothing: Light jacket, warm clothing, comfortable shoes.
  • Winter (December–February): Average -4.6–-33.6°F, cold and dry, with a higher probability of snowfall; some months have higher rainfall. Common activities: Skiing (if snow conditions allow), indoor activities. Recommended clothing: Heavy coat, warm clothing, waterproof boots.

Lewiston climatological average

Annual average temperature: approx. 47.5°F / Annual rainfall: approx. 1320 mm / Summer humidity: 65%–75% / Rainiest month: August

Lewiston monthly average temperature and precipitation

Month
Air temperature (°F)
Precipitation (mm)
January
23.7°F
131
February
26.1°F
49.8
March
34.9°F
149.3
April
44.1°F
118.5
May
56.1°F
70.5
June
63.9°F
97.9
July
71.8°F
123.5
August
67.8°F
151
September
60.8°F
100.5
October
50.7°F
102.3
November
39.6°F
82.8
December
30.4°F
143.6

Lewiston weather for the next seven days

2/1
Sunday
Sunny
27.3°F/-5.1°F
2/2
Monday
Sunny
33.3°F/2.4°F
2/3
Tuesday
Sunny
29.5°F/5.5°F
2/4
Wednesday
Cloudy
30.7°F/14.2°F
2/5
Thursday
Mist
23.1°F/1°F
2/6
Friday
Mist
23.1°F/-1.9°F
2/7
Saturday
Overcast
4.5°F/-1.6°F

Lewiston Frequently Asked Questions and Useful Information for Travel

Is Lewiston worth visiting?

Lewiston offers a vibrant experience with its numerous annual festivals and events, including the Liberty Festival, Riverfest, Great Falls Balloon Festival, BrewFest, Greek Festival, World Refugee Day, and Holiday at the Plaza. The city is also known for its diverse dining options, recreational access to the Androscoggin River, scenic walking trails, and historic sites.

How do ships get to Lewiston, Idaho?

Ships reach Lewiston, Idaho, via the Columbia-Snake River System. This waterway features eight dams and navigation locks, four on the Columbia River and four on the Snake River. These locks enable vessels to transition between different water levels as they travel between Portland/Vancouver and Lewiston.

What is the main industry in Lewiston, Idaho?

The primary industries in Lewiston, Idaho, are agriculture, paper and timber products, and light manufacturing.

What is there to do in the Lewis Clark Valley?

The Lewis Clark Valley, affectionately called The Banana Belt of the Pacific Northwest, is an outdoor enthusiast's paradise. Its warm and dry climate provides year-round recreational activities such as boating, sailing, whitewater rafting, fishing, swimming, golfing, hiking, biking, hunting, and camping.

What are the main attractions in Lewiston?

Lewiston boasts a variety of attractions, from its lively annual festivals like the Great Falls Balloon Festival and Riverfest to its abundant natural beauty along the Androscoggin River. Visitors can enjoy exploring the city's historic areas, diverse culinary scene, and extensive network of walking trails and parks.