National Weather Service Forecast for: Richland WA
Issued by: National Weather Service Pendleton, OR
Updated: 11:46 pm PDT Aug 19, 2026
 
Overnight

Overnight: Mostly clear, with a low around 63. Calm wind.
Mostly Clear
 Thursday

Thursday: Sunny, with a high near 97. Calm wind.
Sunny
 Thursday
Night
Thursday Night: Increasing clouds, with a low around 67. Calm wind.
Increasing
Clouds
 Friday

Friday: Mostly cloudy and hot, with a high near 99. Calm wind becoming northwest around 6 mph in the afternoon.
Hot
 Friday
Night
Friday Night: A 20 percent chance of showers after 11pm. Cloudy, with a low around 70. Northwest wind around 6 mph becoming light and variable in the evening.
Slight Chance
Showers
 Saturday

Saturday: Mostly sunny, with a high near 95.
Mostly Sunny
 Saturday
Night
Saturday Night: Mostly clear, with a low around 61.
Mostly Clear
 Sunday

Sunday: Sunny, with a high near 86.
Sunny
 Sunday
Night
Sunday Night: Mostly clear, with a low around 59.
Mostly Clear
Lo 63 °F Hi 97 °F Lo 67 °F Hi 99 °F Lo 70 °F Hi 95 °F Lo 61 °F Hi 86 °F Lo 59 °F

 

Overnight
 
 Mostly clear, with a low around 63. Calm wind.
Thursday
 
 Sunny, with a high near 97. Calm wind.
Thursday Night
 
 Increasing clouds, with a low around 67. Calm wind.
Friday
 
 Mostly cloudy and hot, with a high near 99. Calm wind becoming northwest around 6 mph in the afternoon.
Friday Night
 
 A 20 percent chance of showers after 11pm. Cloudy, with a low around 70. Northwest wind around 6 mph becoming light and variable in the evening.
Saturday
 
 Mostly sunny, with a high near 95.
Saturday Night
 
 Mostly clear, with a low around 61.
Sunday
 
 Sunny, with a high near 86.
Sunday Night
 
 Mostly clear, with a low around 59.
Monday
 
 Sunny, with a high near 90.
Monday Night
 
 Partly cloudy, with a low around 63.
Tuesday
 
 Sunny, with a high near 93.
Tuesday Night
 
 Mostly clear, with a low around 63.
Wednesday
 
 Sunny, with a high near 91.

 

Forecast from NOAA-NWS for Richland WA.