The best times to visit Lewiston for ideal weather are

May 7th to July 8th


August 13th to October 21st

based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Read below for more weather and travel details.



Other Lewiston Travel Info

Weather in Lewiston


Average temperatures in Lewiston vary drastically. Considering humidity, temperatures feel cold for about half of the year and otherwise nice with a very low chance of rain or snow throughout the year. The area is somewhat temperate — in the 41st percentile for pleasant weather — compared to tourist destinations worldwide. Weeks with ideal weather are listed above. If you’re looking for the very warmest time to visit Lewiston, the hottest months are July, August, and then June. See average monthly temperatures below. The warmest time of year is generally early August where highs are regularly around 96.8°F (36°C) with temperatures rarely dropping below 61.6°F (16.4°C) at night.

Lewiston Temperatures (Fahrenheit)


Lewiston Temperatures (Celsius)


“Feels-Like” Temperatures

The way we experience weather isn’t all about temperature. Higher temperatures affect us much more at higher humidity, and colder temperatures feel piercing with high winds. Our perceived temperatures factor in humidity and wind chill to better represent how hot or cold the day feels to a person.

Lewiston Perceived Temperature (F)


Lewiston Perceived Temperature (C)



Average Lewiston Temperatures by Month

Daily highs (averaged for the month) usually give the best indication of the weather. A significantly lower mean and low generally just means it gets colder at night.

Show Fahrenheit

Month Avg. High (°F) Avg. Mean (°F) Avg. Low (°F)
Jan 43.5 35.5 28.2
Feb 49.1 39.3 31.1
Mar 57.2 45 34.3
Apr 64 50.3 37.9
May 74.3 59.5 45.5
Jun 81.9 66.9 52.8
Jul 94.5 77.3 60
Aug 92.9 75.6 59.6
Sep 83.3 66.4 51.9
Oct 66.4 53 41.7
Nov 50.8 41.1 33
Dec 42.6 34.4 27.3

Show Celsius

Month Avg. High (°C) Avg. Mean (°C) Avg. Low (°C)
Jan 6.4 1.9 -2.1
Feb 9.5 4.1 -0.5
Mar 14 7.2 1.3
Apr 17.8 10.2 3.3
May 23.5 15.3 7.5
Jun 27.7 19.4 11.6
Jul 34.7 25.2 15.6
Aug 33.8 24.2 15.3
Sep 28.5 19.1 11.1
Oct 19.1 11.7 5.4
Nov 10.4 5.1 0.6
Dec 5.9 1.3 -2.6



Precipitation (Rain or Snow)

If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Lewiston are July, August, and then September. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around early July. For example, on the week of July 2nd there are no days of precipitation on average. By contrast, it’s most likely to rain or snow in late March with an average of 2 days of significant precipitation the week of March 26th.

When can you find snow in Lewiston? Weather stations report a good amount of seasonal snow likely to be deepest around February, especially close to early February. The best time to ski (if at all) in Lewiston is often around around December 17th when fresh powder is deepest. Please note that a value of 0 for snow in the graph below may either mean there was no snow, or that snow is unreported.

Chance of Precipitation

The graph below shows the % chance of rainy and snowy days in Lewiston.

Days with precipitation

Snow on the Ground

The graph below shows the average snow on the ground in Lewiston (in).

Snow depth

Average Rain and Snow by Month

Show Inches

Month Daily Chance of Rain Average Snow Depth (in) Total Precipitation (in)
Jan 9% 2 1.1
Feb 13% 2.5 1
Mar 15% 1.2 1.5
Apr 13% 0 1.1
May 14% 0 1.3
Jun 14% 0 1.3
Jul 2% 0 0.2
Aug 4% 0 0.5
Sep 5% 0 0.5
Oct 10% 0 0.9
Nov 14% 2 1.1
Dec 12% 2.4 1.2

Show Centimeters

Month Daily Chance of Rain Average Snow Depth (cm) Total Precipitation (cm)
Jan 9 5.1 2.8
Feb 13 6.4 2.5
Mar 15 3 3.8
Apr 13 0 2.8
May 14 0 3.3
Jun 14 0 3.3
Jul 2 0 0.5
Aug 4 0 1.3
Sep 5 0 1.3
Oct 10 0 2.3
Nov 14 5.1 2.8
Dec 12 6.1 3


Humidity and Wind

Lewiston has some humid months, and dry months in the opposite season. The least humid month is July (23.9% relative humidity), and the most humid month is December (65.7%).

Wind in Lewiston is usually calm. The windiest month is April, followed by January and March. April’s average wind speed of around 5.3 knots (6.1 MPH or 9.8 KPH) is considered “a light breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in early to mid April where average top sustained speeds reach 14.8 knots, which is considered a moderate breeze.

Relative Humidity (%)

The graph below shows the average % humidity by month in Lewiston.

Avg. Relative Humidity


The graph below shows wind speed (max and average) in knots.

Max Sustained Wind
Average Daily Wind

Average Wind Speeds

Show Wind Speeds

All wind speeds are in knots. 1 knot = 1.15 MPH or 1.85 KPH.

Month Avg. Wind Avg. Wind Feel Sustained High Wind High Wind Feel
Jan 5.1 Light breeze 12.2 Significant breeze
Feb 4.5 Light breeze 11.3 Significant breeze
Mar 4.9 Light breeze 13 Significant breeze
Apr 5.3 Light breeze 13.5 Significant breeze
May 4.6 Light breeze 11.9 Significant breeze
Jun 4.5 Light breeze 12.2 Significant breeze
Jul 4.4 Light breeze 12.3 Significant breeze
Aug 4.1 Light breeze 12 Significant breeze
Sep 3.8 Barely noticeable 10.6 Significant breeze
Oct 3.8 Barely noticeable 10.3 Gentle breeze
Nov 4.5 Light breeze 11.5 Significant breeze
Dec 4.6 Light breeze 11.8 Significant breeze

Show Relative Humidity by Month

Month Avg. Relative Humidity
Jan 63.2%
Feb 60.4%
Mar 51.4%
Apr 42.9%
May 39%
Jun 37.7%
Jul 23.9%
Aug 24.4%
Sep 30.9%
Oct 49.6%
Nov 62.8%
Dec 65.7%


Is it Safe to Travel to Lewiston?

Our best data indicates this area is generally safe. As of Oct 07, 2019 there are no travel advisories or warnings for the United States; exercise normal security precautions. Check this page for any recent changes or regions to avoid: Travel Advice and Advisories. This advisory was last updated on Sep 23, 2019.


The Busiest and Least Crowded Months

The busiest month for tourism in Lewiston, ID, US is July, followed by August and May. Prices for hotels and flights will be most expensive during these months, though you can save if you purchase well in advance. Tourists are unlikely to visit Lewiston in September. Those willing to visit at these times will likely find it the least expensive month.

Estimated Tourism by Month


Most Popular Months to Visit

Tourists Seeking Accommodations

Tourism graph is based on Google searches for services used by tourists relative to the rest of the year. Tourism data for this area is extrapolated based on nearby areas. Displayed data is calculated relative to the peak, so a score of 36.1 in September means 36.1% of the tourists vs. July.



Overall Lewiston Travel Experience by Season

Spring (March through May)

Humidity and temperatures combine to make this season feel moderately cold. Highs range from 78.9°F (26.1°C) and 51.2°F (10.7°C) with warmer temperatures in the later months. Rain is somewhat common with 4 to 5 days of significant precipitation per month. Spring is the second busiest for tourism, which makes it a good time for those looking for things to do.

Summer (June through August)

The middle-year months have very comfortable weather with high temperatures that are quite warm. These months see the least precipitation with 1 to 4 days of precipitation per month. June – August is the busiest season for tourism in Lewiston, so lodging and other accommodations may cost more than usual.

Fall (September through November)

Fall daily highs range from 87.7°F (30.9°C) and 44.3°F (6.8°C), which will feel chilly given the humidity and wind. It rains or snows a normal amount: 1 to 4 days per month. Tourism is the slowest during these months due to the weather, so hotels may be affordably priced.

Winter (December through February)

Weather is too cold this time of year in Lewiston to be enjoyable for warm weather travelers. The average high during this season is between 53°F (11.7°C) and 42°F (5.6°C). On average, it rains or snows a smalll amount: 3 to 4 times per month. These times of year are fairly slow with tourists.


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