Aurora in Portland on October 4, 2025

October 4, 2025

Portland change region

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Probability of aurora in Portland

Probability of aurora as of end of day, October 4, 2025, Portland time

1 % Portland

Aurora intensity index

Auroral intensity index and estimated minimum latitude of auroral observations at zenith as of the end of October 4, 2025, Portland time

Aurora over North America

Changes in the auroral oval on October 4, 2025 in United States from the beginning to the end of the day, Coordinated Universal Time (UTC)

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Aurora in the northern hemisphere

Changes in the auroral oval on October 4, 2025 in the northern hemisphere from the beginning to the end of the day, Coordinated Universal Time (UTC)

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Probability of aurora in cities of United States

Estimated probabilities of aurora observations at zenith for cities in United States as of end of day October 4, 2025.

0 % Washington

0 % New York

0 % Chicago

0 % Philadelphia

2 % Seattle

0 % Detroit

1 % Portland

0 % Boston

0 % Madison

5 % Bismarck

1 % Olympia

3 % Helena

2 % Saint Paul

33 % Fairbanks

15 % Anchorage

18 % Juneau

7 % Hooper Bay

16 % Nome

26 % Kotzebue

31 % Utqiagvik

7 % Bethel

18 % Cordova

Aurora intensity over 2 days

Changes in the auroral intensity index from October 3 to 4, 2025 in the northern hemisphere, Portland time

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