Lewiston climate
Dry air and long warm seasons support outdoor life, while heat, smoke, and winter roads shape the home choice
NOAA 1991 through 2020 normals for Lewiston Nez Perce County Airport show an annual mean temperature of 53.8 degrees Fahrenheit, annual precipitation of 12.87 inches, annual snowfall of 12.7 inches, a July mean of 75.8 degrees, a January mean of 36.2 degrees, and about 44 days each year at or above 90 degrees. The airport station is a regional reference, while river elevations and hills can create local differences.
A separate 2025 annual summary recorded a mean temperature of 56.1 degrees, 10.06 inches of precipitation, 11.6 inches of snow, 63 days at 90 degrees or higher, and a high of 104 degrees. That was one warmer and drier year, not a replacement for the 30 year normals. Plan for cooling, shade, air filtration, smoke alerts, wildfire preparation, dry landscaping, winter footing, drainage, and power interruptions.
A retiree who enjoys dry weather may appreciate river walks, parks, trails, and long outdoor seasons. Someone sensitive to heat, smoke, or winter roads may prefer a home near daily services with strong cooling, clean indoor air, covered parking, gentle access, indoor arts and library options, and a plan that does not depend on one route.
Living through the seasons
Summers are the easier season. Winter comfort deserves a closer look.
- Overall Comfort
- Moderate
2.4 / 5
- Average Summer High
- 83°F
- Days Above 90°F
- 27 days/year
- Summer Feel
- Very Good
Mild · 83°F
Excellent
4.1 / 5
- Average Winter Low
- 25°F / -4°C
- Days Below Freezing
- 138 days/year
- Winter Feel
- Poor
Fair
Poor
1 / 5
The shape of the year
Humidity, comfortable months, and sunshine show how the seasons differ.
- Humidity
- 67%
- Comfortable Months
- 5 months
- Solar Exposure
- 1455 peak sun hrs/yr
Good
Fair
Poor
Air, allergies, and weather
Air quality and allergies shape day to day comfort. The best months and weather risks help with timing.
Air and allergies
- Air Quality
- Excellent
- Allergy Levels
- Poor
4.7 / 5
Current AQI
Checking…
Current PM2.5
Checking…
Timing and weather
- Long Term Fine Particle Pollution
- 5.2 µg/m³ 2021-2025 modeled average
- Best Months
- May, Jun, Jul, Aug, Sep
- Toughest Months
- Feb, Jan, Dec
- Heat Risk
- Moderate
- Drought Risk
- Low
- Weather Volatility
- Moderate
Good · 5.2 µg/m³ 2021-2025 modeled average
Good
2.9 / 5
Lewiston in everyday life
Could Lewiston work for you?
What may work well
- Dry conditions and long warm seasons support parks, river outings, trails, and outdoor programs for much of the year.
- NOAA normals, the NWS annual summary, and county hazards provide concrete questions for heat, smoke, rain, snow, and power.
- A well-maintained home can pair comfortable indoor air with flexible outdoor and cultural plans.
What to think about
- Heat, wildfire smoke, dry conditions, heavy rain, flooding, snow, wind, and power interruptions can alter plans.
- The home needs dependable cooling, filtration, drainage, roof, trees, insurance, protected utilities, and power planning.
- A mild winter or spring visit does not answer summer indoor air, smoke exposure, heat, or the full care route.
Make Lewiston weather part of the housing decision
Inspect cooling and filtration
Review air conditioning, HVAC filters, insulation, windows, shade, utility history, roof, gutters, smoke response, and backup power.
Check rain and drainage
Review flood maps, lot grade, culverts, crawlspace or basement, sump, gutters, downspouts, roof, trees, insurance, and the route to the street.
Plan smoke and heat mobility
Add alerts, clean indoor air, filters, cooling, medicines, power planning, fuel, backup rides, and extra travel time during wildfire smoke or extreme heat.
Visit in more than one season
Compare a hot period, a smoke period, heavy rain, and a winter visit if possible. Notice indoor comfort, walking, errands, care travel, and the return.
Questions retirees ask
What is Lewiston, Idaho weather like?
Lewiston normals show dry conditions, warm summers, about 12.7 inches of annual snow, 12.87 inches of annual precipitation, and about 44 days at or above 90 degrees. Use normals, annual summaries, visits, and inspection to judge comfort.
Does Lewiston get wildfire smoke?
The county hazard plan identifies wildfire and smoke as important seasonal concerns and notes that smoke can travel many miles. Review alerts, clean indoor air, cooling, filters, medicines, power, and an indoor plan.
What should I inspect in a Lewiston home?
Check cooling, air filtration, insulation, windows, roof, gutters, drainage, flood maps, slope, crawlspace or basement, sump, trees, insurance, utility history, parking, and the hospital route.
Can I enjoy outdoor life across the year?
Parks, rivers, Hells Gate, trails, and regional history offer choices, but heat, smoke, dry conditions, rain, snow, winter grades, surfaces, and closures will change which outing feels comfortable.
How should a retiree prepare for a smoke event?
Confirm alerts, clean indoor air, replacement filters, cooling, food, water, medicines, power backup, communication, insurance, transportation, and a care route that remains usable during poor air quality.
Lewiston's climate can suit someone who enjoys dry air and long warm seasons and accepts a serious cooling, filtration, wildfire smoke, drainage, and winter road plan. Choose a home with dependable indoor air, sound site drainage, safe access, reliable power, and a care route that remains usable when valley weather changes.
Sources
Climate comfort helps estimate how practical daily life may feel across the year, especially for heat, humidity, cold, and seasonal constraints.
Seasonal timing, health conditions, air conditioning, air quality, and elevation can change the lived experience.
- NASA POWER
Used for Overall Comfort, Summer Feel, Average Summer High, Days Above 90°F, Winter Feel, Average Winter Low, Days Below Freezing, Humidity, Comfortable Months, Solar Exposure, Best Months, Toughest Months, Allergy Levels, Heat Risk, Weather Volatility
- Open-Meteo / Copernicus CAMS
Used for Air Quality, Long-Term Fine-Particle Pollution
Checked 2026-05-18
- Federal Emergency Management Agency National Risk Index
Used for Drought Risk
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Partner with Retirement ListsResearch and writing byGrant Gibson
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