Clear Skies, Possible Aurora Activity Forecast In Washington

SEATTLE, WA — The last days of September are poised to be sunny and warm, as the remaining clouds clear out and temperatures build well beyond seasonal normals, according to the latest forecasts.

The first day of October could see afternoon highs above 80 in the Seattle region — a rare feat for a month that has only seen such temperatures seven times in the last 75 years.

Forecasters expect the last of the clouds to dissipate by Sunday afternoon, leaving clear skies that should stick around into next weekend. Monday could begin with some patchy fog in some areas, with abundant sunshine by the afternoon and temperatures in the mid-60s to mid-70s. Tuesday is likely to be a "carbon copy" of the day before, with temperatures a few degrees warmer, before afternoon highs climb into the lower 80s Wednesday.

NOAA issues moderate geomagnetic storm watch; potential for Northern Lights in Washington

The cloudless conditions are well-timed for a moderate geomagnetic storm, which may allow for a visible aurora over Western Washington, particularly late Monday and early Tuesday.

According to the Space Weather Prediction Center's planetary K index — a measure of a geomagnetic storm's strength — the levels reached during peak hours would potentially allow for visibility near Seattle. As usual, the best chance for viewing the lights will be in areas away from city lights and with a clear view of the northern sky.

Find current space weather conditions and learn more about the best viewing strategies on the SWPC website.