Updated September 14, 2022
As the state's lead agency for water supplies, we pay close attention to multiple data sources and monitor them closely. The Office of the Washington State Climatologist serves as a credible and expert source of climate and weather information for the state. Their monthly newsletter reviews the previous month’s data and provides an outlook for the coming weeks.
August in Washington is typically both hot and dry, but last month was the warmest on record since 1895 with three separate heat waves and numerous daily records. Tolt South Fork Reservoir, Renton, Seattle Weather Forecasting Office, and Olympia also set high minimum temperature records for the entire month of August. August precipitation was below normal for most of the state, despite widespread thunder storms on the 10th, and tied 1974 as the 16th driest on record.
La Nina conditions are expected to persist through the fall and winter. September is predicted to have above normal temperatures and normal to below normal precipitation, but the three month outlook is likely near normal to slightly above normal for both temperatures and rain statewide.
Find details in the September State Climatologist’s Newsletter, including information on the Oregon/Washington Water Year 2022 Recap and 2023 Outlook meeting scheduled for October 25 and 26, for which registration is open.