Aurora Borealis in Sammamish
United States · 47.64°, -122.08° · geomagnetic 53.2° · needs Kp 7
Tonight's aurora forecast for Sammamish
1%
Peak chance of a visible display tonight, from the same model the Revon app runs. Sammamish 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.
Get the full 30-night forecast in Revon
Updated 2026-09-08 10:36 UTC
Local aurora guide for Sammamish
Sammamish is at a geomagnetic latitude of 53.2°.
Auroras visible at Kp 7 occur about 3.2 nights per year.
The record span for these observations is from April 2, 2016, to March 30, 2026.
The best months for aurora viewing in Sammamish are May, September, and August.
Sammamish has a Bortle scale rating of 6.
Areas with a Bortle rating of 4 are located 27 km east-north-east near King County.
Nearby terrain includes Arthur Johnson Park to the north, Westside Park to the west-north-west, and Union Hill to the east-north-east.
Arthur Johnson Park is located 3.6 km north of Sammamish.
Westside Park is situated 4.3 km west-north-west of Sammamish.
Union Hill is a mountain 7.0 km east-north-east of Sammamish.
There are 60 verified aurora reports within 300 km of Sammamish between January 1, 2015, and December 31, 2016.
The average number of viable aurora nights per year is 3.2.
Notable qualifying nights include March 20, 2026 (Kp 7.0), January 20, 2026 (Kp 7.67), January 19, 2026 (Kp 8.67), November 12, 2025 (Kp 7.33), and November 11, 2025 (Kp 8.67).
Sources: Revon location dataset · Revon analysis of NOAA planetary Kp · Falchi 2016 World Atlas of artificial night sky brightness · GeoNames (CC BY 4.0) · Aurorasaurus verified positive reports
Know when it is worth going outside
Revon watches the Sammamish forecast and pushes an alert when the odds for tonight clear your threshold — no checking, no guessing.
Nearby towns
Forecasts for places within reach of Sammamish.