Home / Local Weather & Traffic / Washington / Onalaska / Weather Forecast

Onalaska, WA Weather Tomorrow

For a complete weather outlook, review tomorrow's Onalaska forecast and the following 5 days with precipitation potential, daytime and nighttime forecasts, temperature highs and lows in Fahrenheit and Celsius, sunrise and sunset times, cloud cover, wind chill, wind speed, and wind direction for the Onalaska area and around Lewis county, Washington.
Updated: Sat Aug 29th 2026 9:00 AM PDT
Onalaska, WA Weather – 8-29 – Scattered Showers
66° / 50°
Scattered Showers
On and off showers are set to occur in Onalaska, with a high of 66°F and a low of 50°F. The chance of rain is 86% with an estimated 0.47in. Winds will be light at 5mph and gusts of 9.7mph at 2 PM. The humidity will be on the higher side, averaging about 80%, the maximum being 98% at 11 PM and 53% being its lowest at 1 PM. Barometric pressure is its highest of 30.09inHg at 10 PM, a lowest point of 30.02inHg at 4 PM with an avg 30.05inHg.
Onalaska, WA Weather – 8-30 – Cloudy
65° / 50°

Weather Tomorrow

Cloudy
Highs will reach 65°F with lows near 50°F in Onalaska, where overcast conditions are. There's a moderate 32% chance of rainfall with an estimated 0.01in. Winds will be light at 5mph and gusts of 13mph at 2 AM. The humidity will be on the higher side, averaging about 77%, the maximum being 98% at 12 AM and 50% being its lowest at 2 PM. Barometric pressure is its highest of 30.1inHg at 12 PM, a lowest point of 30.01inHg at 6 PM with an avg 30.06inHg.
Onalaska, WA Weather – 8-31 – Overcast
74° / 49°
Overcast
Daytime highs will reach 74°F with lows dropping to 49°F in Onalaska, where skies will be overcast. There might be light rainfall having a 15% chance. Winds will be light at 7mph and gusts of 17mph at 3 PM. The humidity will be on the higher side, averaging about 71%, the maximum being 97% at 1 AM and 38% being its lowest at 4 PM. Barometric pressure is its highest of 30.02inHg at 12 AM, a lowest point of 29.82inHg at 6 PM with an avg 29.92inHg.
Onalaska, WA Weather – 9-1 – Overcast
73° / 52°
Overcast
Onalaska may see cloud-filled skies, with daytime highs of 73°F and overnight lows near 52°F. There might be light rainfall having a 22% chance with an estimated 0.01in. Winds will be light at 9mph and gusts of 14.8mph at 5 PM. The humidity will be on the higher side, averaging about 70%, the maximum being 94% at 6 AM and 35% being its lowest at 3 PM. Barometric pressure is its highest of 29.87inHg at 2 AM, a lowest point of 29.76inHg at 5 PM with an avg 29.83inHg.
Onalaska, WA Weather – 9-2 – Light Rain Shower
57° / 51°
Light Rain Shower
Daytime highs will reach 57°F with lows dropping to 51°F in Onalaska, where it will rain at times. The chance of rain is 93% with an estimated 0.63in. Winds will be light at 10mph and gusts of 27.3mph at 2 PM. High humidity with average of 92% is anticipated, the maximum being 97% at 8 AM and 77% being its lowest at 4 AM. Barometric pressure is its highest of 29.87inHg at 2 PM, a lowest point of 29.79inHg at 6 AM with an avg 29.84inHg.
Onalaska, WA Weather – 9-3 – Light Rain Shower
60° / 49°
Light Rain Shower
Daytime highs will reach 60°F with lows dropping to 49°F in Onalaska, where periods of rain are likely. The chance of rain is 86% with an estimated 0.23in. Winds will be light at 5mph and gusts of 12.5mph at 11 PM. High humidity with average of 88% is anticipated, the maximum being 96% at 6 AM and 74% being its lowest at 5 PM. Barometric pressure is its highest of 30inHg at 11 PM, a lowest point of 29.87inHg at 4 AM with an avg 29.91inHg.

Currently

Light Rain 57°F
30.07 inHg.
Barometer
82%
Humidity
SSW 4.3 mph
Wind
Light Rain

5 Day Forecast Nearby

More Local Information

Bookmark and Share

Get the LocalConditions.com App on Google Play
Sign up for a membership to go Ad free

Onalaska Community Weather Reports

Write your own Onalaska, WA report, forecast, or traffic update:


Will not be posted, shared or used for marketing!

Please note by clicking on "Post" you acknowledge that you have read our Privacy Policy and Terms of Service and the Onalaska, WA report and/or forecast you are posting is in compliance with such terms. If you are under 18, do not submit this form. Be respectful! Inappropriate content will be removed by a moderator.