Aurora Borealis in Mercer Island
United States · 47.57°, -122.22° · geomagnetic 53.1° · needs Kp 7
Tonight's aurora forecast for Mercer Island
1%
Peak chance of a visible display tonight, from the same model the Revon app runs. Mercer Island needs Kp 7 to see anything at all, and tonight the forecast peaks at Kp 4.7. Short of the threshold, which is what most nights look like here.
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Updated 2026-09-08 10:36 UTC
Local aurora guide for Mercer Island
Aurora activity is measured by the Kp index, with Kp 7 considered a threshold for viewing. Mercer Island is at 53.1° geomagnetic latitude. On average, there are 3.2 nights per year with conditions suitable for aurora viewing.
These viewing opportunities are based on historical data spanning from April 2, 2016, to March 30, 2026.
The best months for aurora viewing near Mercer Island are May, September, and August. These months align with periods of darker skies, increasing the chances of observing the aurora.
Mercer Island experiences a Bortle 8 light pollution level. However, areas with darker skies, such as near King County, offer Bortle 4 conditions.
Local viewpoints include Burrows Landing Park, Faben Point, Bellefields Nature Park, Groat Point, and Whalers Cove, offering varied horizons.
Geographic features near Mercer Island that may offer viewing opportunities include Burrows Landing Park to the north-north-east, Faben Point to the north-west, and Bellefields Nature Park to the north-east.
Additional locations to consider are Groat Point to the north and Whalers Cove to the north-north-east.
Historical records show 60 verified aurora sightings within 300 km of Mercer Island between January 1, 2015, and December 31, 2016.
The period from 2016 to 2026 includes several nights with significant aurora activity, such as March 20, 2026 (Kp 7.0), January 20, 2026 (Kp 7.67), and January 19, 2026 (Kp 8.67).
Other notable nights within this span include November 12, 2025 (Kp 7.33) and November 11, 2025 (Kp 8.67).
Sources: Revon analysis of NOAA planetary Kp · Revon location dataset · Falchi 2016 World Atlas of artificial night sky brightness · GeoNames (CC BY 4.0) · Aurorasaurus verified positive reports
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Forecasts for places within reach of Mercer Island.