SPOKANE, Wash — A gradual warming trend has taken place around the Inland Northwest since Bloomsday and it only amps up toward Mother's Day as some parts of Central Washington could make it to 90 degrees for an afternoon high.

Most areas will see temperatures between 10 and 20 degrees above average. The cause of this is a growing ridge of high pressure. When high pressure is overhead, it typically brings along with it clearer skies and warmer afternoon temperatures which is exactly the case going into the weekend. 

Here are forecast high temperatures for this Sunday, Mother's Day:

  • Moses Lake: 90°
  • Colville: 90°
  • Grand Coulee: 89°
  • Lewiston: 88°
  • Ritzville: 86°

The seasonal average for this time of year across Central Washington is in the low 70s and even as low as the upper 60s in some cases. These afternoon highs bring us very well above that average. 

90 degree highs

By Monday of next week, temperatures begin to cool down. We'll see mostly 70s for the work-week and no chance of showers comes around until about Wednesday of next week.