News | Washington State Climate Office

Oct 7, 2025 | Climate Matters, Climate Variability, El Niño/La Niña and Global Climate Oscillations, October 2025 Newsletter

Climate Matters: Haven’t there been a lot of La Niña winters lately?

Many regular readers of this column are aware of the effects of La Niña, and variations in the El Niño-Southern Oscillation (ENSO) in general, on the overall weather of the Pacific Northwest during the cool season.

Oct 7, 2025 | Climate Outlook, October 2025 Newsletter

Early October Climate Outlook

A La Niña Advisory was issued by the Climate Prediction Center on October 9 indicating that La Niña conditions are currently in place. La Niña conditions are the most likely scenario now through December-January-February.

Oct 7, 2025 | Climate Summary, October 2025 Newsletter

September 2025 Climate Summary

September 2025 was the warmest September on record in Washington back to 1895. Temperatures were +5.2°F warmer than the 1991-2020 normal when averaged statewide. Much warmer than normal temperatures observed across the eastern slopes of the Cascades and across much of eastern Washington.

Oct 7, 2025 | Announcements, October 2025 Newsletter

Join us for the PNW Water Summit

WHEN: November 4, 2025 7:30 am-4 pm PT (8:30 am to 5 pm MT)
WHERE: In person at Boise State University or Limited Virtual
Please register by October 30 to ensure an accurate catering count.

Oct 7, 2025 | Announcements, October 2025 Newsletter

The Annual PNW Water Year Impacts Survey Is Now Live!

Happy 2026 Water Year! Now that water year 2025 is complete, we want to hear from you! How was the Pacific Northwest (Washington, Oregon, and Idaho) impacted?
We encourage you to fill out the PNW Water Year 2025 Impacts Survey.

Oct 7, 2025 | Drought and Streamflow Update, October 2025 Newsletter

September 2025 Drought and Streamflow Update

Streamflow deteriorated during September as a result of warmer than normal temperatures and a relatively slow start to the rainy season. A map of September streamflow percentiles by watershed reveals that the vast majority of watersheds are below normal or much below normal, seen in orange and brick red shading.

Oct 7, 2025 | Notable Weather Events, October 2025 Newsletter

September 2025 Notable Weather Events

September was once again a warmer than average month statewide. This was especially true across eastern Washington where prolonged warm spells with particularly warm overnight temperatures led to anomalies of around 5-8°F above normal.