Aurora Borealis in West Lake Sammamish
United States · 47.58°, -122.10° · geomagnetic 53.1° · needs Kp 7
Tonight in West Lake Sammamish
1%
Peak chance of a visible display tonight, from the same model the Revon app runs. West Lake 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.
Updated 2026-08-02 20:20 UTC
The next 30 nights in West Lake Sammamish
Every night to come, scored the same way as tonight. The best of the open week is Sunday 2 Aug at 1%. Not one of the seven reaches the Kp 7 that West Lake Sammamish needs, which is normal rather than unlucky — it averages 3.2 viable nights a year. The 23 nights past the seven-day window move with the 27-day solar rotation and are updated daily in the app.
Nights 8–30 unlock in the Revon app
See all 30 nights for West Lake Sammamish
Revon aurora model over the NOAA Kp forecast and 27-day outlook
How often the aurora borealis reaches West Lake Sammamish
3.2 nights a year, averaged across 10.0 years of records
| Storm level | Nights / year |
|---|---|
| Kp 4 | 83.4 |
| Kp 5 | 28.7 |
| Kp 6 | 9.3 |
| Kp 7 | 3.2 |
| Kp 8 | 1.2 |
NOAA planetary Kp, 2016-04-02 to 2026-03-30
Wait for an alert; do not book a week
At Kp 7, West Lake Sammamish needs a severe geomagnetic storm before anything shows above the northern horizon. Storms that size arrive a handful of times per solar cycle and announce themselves a day or two ahead. Watching for one beats picking dates and hoping.
Hours of true darkness, month by month
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 11.5 | 10.3 | 8.8 | 6.6 | 4.1 | 1.9 | 3.0 | 5.7 | 8.0 | 9.9 | 11.2 | 11.8 |
Solar declination and hour angle at −18°
Getting clear of the light
The sky over West Lake Sammamish reads Bortle 6. Getting clear of the built-up area makes a visible difference on a marginal night.
- 28 km east-south-east — around King County → Bortle 4
- 28 km east-south-east — around King County → Bortle 4
Falchi 2016 World Atlas (DOI: 10.5880/GFZ.1.4.2016.001)
The months that actually deliver
Counting only nights that were both stormy enough and dark enough, May, September and August came out ahead in West Lake Sammamish. That is storm season and darkness overlapping — the equinoxes tend to be geomagnetically active, and the nights are already long by then.
Darkest nights of the coming year
A bright moon washes out a weak display as effectively as street lighting. These new moons fall inside the West Lake Sammamish viewing season.
- 13 Aug 2026
- 11 Sep 2026
- 11 Oct 2026
- 09 Nov 2026
- 09 Dec 2026
- 07 Jan 2027
- 06 Feb 2027
Where it is close to a certainty
If you would rather plan a trip than wait for a storm, the nearest place with genuinely frequent aurora is Juneau, 1,445 km north-north-west in United States.
| West Lake Sammamish | Juneau | |
|---|---|---|
| Kp needed | 7 | 5 |
| Nights per year | 3.2 | 28.7 |
| Geomagnetic latitude | 53.1° | 61.6° |
Confirmed reports from this area
60 verified sightings were logged within 300 km of West Lake Sammamish between 2015-01-01 and 2016-12-31. Rare is not the same as impossible.
Aurorasaurus verified positive reports
Where the horizon opens up near West Lake Sammamish
The display sits low on the northern horizon, so what beats a better forecast is open ground facing that way. Height gets you above the town glow; water gives you an unbroken skyline. These are within a short drive of West Lake Sammamish.
- Robinswood Park — park3.1 km west-north-west
- Lake Hills Green Belt Park — park3.6 km north-west
- Larsen Lake — lake4.2 km north-west
- Pine Lake — lake4.4 km east-north-east
- Rosemont Beach — beach4.8 km north
- Weber Point — cape7.3 km north
Places from GeoNames (CC BY 4.0)
What to do with the daylight
Aurora watching is a night job, and in winter that leaves a short, bright day to fill. Close to West Lake Sammamish you will find KBCS-FM (Bellevue), KIXI-AM (Mercer Island) and KIXI-AM (Mercer Island-Seattle), and for a day when the cloud sits low, Bellevue Art Museum and Rosalie Whyel Museum of Doll Art are indoors and near by.
Keep the daylight loose: the sky decides the evening, and the forecast can turn within a few hours.
Places from GeoNames (CC BY 4.0)
Where to stay
Anywhere on the outskirts of West Lake Sammamish will do; what matters is being able to step outside and check the sky without a drive first.
- Embassy Suites Seattle - Bellevue 2.2 km from the centre
- Embassy Suites Bellevue 2.4 km from the centre
- Days Inn Bellevue Seattle 2.6 km from the centre
- Silver Cloud Inn - Bellevue Eastgate 3.3 km from the centre
- Homestead Seattle-Bellevue 4.7 km from the centre
- Extended Stay America Seattle Bellevue Factoria 4.7 km from the centre
Places from GeoNames (CC BY 4.0) — confirm before booking
The last nights it was visible here
Nights in the last decade when the storm was strong enough for West Lake Sammamish and the sky was dark enough to show it.
| Date | Peak |
|---|---|
| 2026-03-20 | Kp 7.0 |
| 2026-01-20 | Kp 7.67 |
| 2026-01-19 | Kp 8.67 |
| 2025-11-12 | Kp 7.33 |
| 2025-11-11 | Kp 8.67 |
NOAA planetary Kp
Know when it is worth going outside
Revon watches the West Lake Sammamish forecast and pushes an alert when the odds for tonight clear your threshold — no checking, no guessing.
Common questions about the aurora borealis in West Lake Sammamish
Can you see the aurora borealis from West Lake Sammamish?
Yes. On the last 10.0 years of NOAA Kp records, West Lake Sammamish had about 3.2 nights a year when the storm was strong enough and the sky dark enough at the same time.
What Kp index do you need to see the aurora borealis in West Lake Sammamish?
Kp 7. West Lake Sammamish sits at geomagnetic latitude 53.1°, and the auroral oval only reaches that far from the pole once activity hits Kp 7. Storms that size occur about 3.2 nights a year.
When is the best time of year to see the aurora borealis in West Lake Sammamish?
May, September and August. Those months scored highest once both conditions are counted together: geomagnetic activity and enough hours of real darkness.
Where can you escape the light pollution near West Lake Sammamish?
The centre of West Lake Sammamish reads Bortle 6. The nearest sky at Bortle 4 is about 28 km east-south-east around King County. On a marginal night that drive matters more than the forecast does.
Where is the nearest place to West Lake Sammamish with reliable aurora borealis?
Juneau, United States — 1,445 km north-north-west. It needs only Kp 5 and averages 28.7 viable nights a year against 3.2 in West Lake Sammamish.
Nearby towns
Forecasts for places within reach of West Lake Sammamish.