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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 1.6–13.4°C, 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 17.7–22.1°C, 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 16.0–4.2°C, 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–-0.9°C, 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. 8.6°C / Annual rainfall: approx. 1320 mm / Summer humidity: 65%–75% / Rainiest month: August

Lewiston monthly average temperature and precipitation

Month
Air temperature (°C)
Precipitation (mm)
January
-4.6°C
131
February
-3.3°C
49.8
March
1.6°C
149.3
April
6.7°C
118.5
May
13.4°C
70.5
June
17.7°C
97.9
July
22.1°C
123.5
August
19.9°C
151
September
16°C
100.5
October
10.4°C
102.3
November
4.2°C
82.8
December
-0.9°C
143.6

Lewiston weather for the next seven days

12/18
Thursday
Sunny
5.4°C/-7°C
12/19
Friday
Heavy rain
10.1°C/0.5°C
12/20
Saturday
Partly Cloudy
-3.1°C/-7.4°C
12/21
Sunday
Moderate or heavy snow showers
4.2°C/-3.4°C
12/22
Monday
Sunny
-4.9°C/-8.1°C
12/23
Tuesday
Partly Cloudy
-3.7°C/-9.9°C
12/24
Wednesday
Heavy snow
-0.6°C/-5.5°C

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.