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Lake Sammamish is one of the lakes LakeRadar tracks in Washington. At around 4,897 acres (about 8 square miles), it is a mid-sized waterbody. If you are planning a trip, Lake Sammamish, Lake Washington, and American Lake are also nearby. For this location, LakeRadar tracks an hourly and 7-day forecast, wind and gust outlook, and activity scores for boating, paddling, and swimming. Current weather, wind, and activity conditions for Lake Sammamish are updated throughout the day.
Updated
No active alerts for this lake as of the last check (Oct 9, 9:45 AM PDT). Alerts are re-checked automatically; see the official source for updates.
Overall Good (75/100) across 4 activities. Best right now: Fishing (77/100).
How the score is calculated →Best excellent fishing window, averaging 92/100 across these hours. Wind 5 mph from the north. Dusk hours (18:00 local). Derived from the hourly forecast; official alerts are not forecast and are checked separately.
| Metric | 4p | 5p | 6p | 7p | 8p | 9p | 10p | 11p | 12a | 1a | 2a | 3a | 4a | 5a | 6a | 7a | 8a | 9a | 10a | 11a | 12p | 1p | 2p | 3p |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp (°F) | 55° | 57° | 58° | 58° | 59° | 60° | 59° | 59° | 58° | 56° | 54° | 53° | 52° | 51° | 50° | 49° | 48° | 48° | 47° | 47° | 46° | 46° | 45° | 46° |
| Wind (kts) | 6 | 5 | 3 | 2 | 2 | 2 | 2 | 1 | 2 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 0 |
| Direction | SW | SW | N | NE | NE | NE | NE | NE | NE | E | E | E | SE | SE | SE | S | S | S | S | S | S | S | S | — |
| Gusts (kts) | 18 | 15 | 11 | 9 | 8 | 6 | 5 | 5 | 5 | 4 | 4 | 5 | 5 | 6 | 7 | 8 | 8 | 8 | 7 | 6 | 5 | 5 | 5 | 2 |
| Precip % | 70% | 45% | 60% | 66% | 59% | 32% | 30% | 32% | 46% | 37% | 36% | 43% | 42% | 32% | 16% | 14% | 15% | 19% | 21% | 22% | 9% | 10% | 7% | 6% |
| Time | Temp | Wind | Gusts | Precip | Cloud | Condition |
|---|---|---|---|---|---|---|
| Fri, 9 AM PDT | 55°F | 7 mph SW (225°) | 21 mph | 70% | 89% | Light Rain Likely |
| Fri, 10 AM PDT | 57°F | 6 mph SSW (203°) | 17 mph | 45% | 89% | Chance Light Rain |
| Fri, 11 AM PDT | 58°F | 3 mph N (0°) | 13 mph | 60% | 78% | Light Rain Likely |
| Fri, 12 PM PDT | 58°F | 2 mph NNE (23°) | 10 mph | 66% | 78% | Light Rain Likely |
| Fri, 1 PM PDT | 59°F | 2 mph NNE (23°) | 9 mph | 59% | 73% | Light Rain Likely |
| Fri, 2 PM PDT | 60°F | 2 mph NE (45°) | 7 mph | 32% | 71% | Chance Light Rain |
| Fri, 3 PM PDT | 59°F | 2 mph NNE (23°) | 6 mph | 30% | 78% | Chance Light Rain |
| Fri, 4 PM PDT | 59°F | 1 mph NE (45°) | 6 mph | 32% | 83% | Chance Light Rain |
| Fri, 5 PM PDT | 58°F | 2 mph NE (45°) | 6 mph | 46% | 82% | Chance Light Rain |
| Fri, 6 PM PDT | 56°F | 1 mph ENE (68°) | 5 mph | 37% | 80% | Chance Light Rain |
| Fri, 7 PM PDT | 54°F | 1 mph E (90°) | 5 mph | 36% | 88% | Chance Light Rain |
| Fri, 8 PM PDT | 53°F | 1 mph E (90°) | 6 mph | 43% | 90% | Chance Light Rain |
| Fri, 9 PM PDT | 52°F | 1 mph ESE (113°) | 6 mph | 42% | 80% | Chance Light Rain |
| Fri, 10 PM PDT | 51°F | 2 mph SE (135°) | 7 mph | 32% | 77% | Chance Light Rain |
| Fri, 11 PM PDT | 50°F | 2 mph SE (135°) | 8 mph | 16% | 73% | Slight Chance Light Rain |
| Sat, 12 AM PDT | 49°F | 2 mph SSE (158°) | 9 mph | 14% | 70% | Mostly Cloudy |
| Sat, 1 AM PDT | 48°F | 2 mph SSE (158°) | 9 mph | 15% | 49% | Slight Chance Light Rain |
| Sat, 2 AM PDT | 48°F | 2 mph SSE (158°) | 9 mph | 19% | 39% | Slight Chance Light Rain |
| Sat, 3 AM PDT | 47°F | 2 mph S (180°) | 8 mph | 21% | 40% | Slight Chance Light Rain |
| Sat, 4 AM PDT | 47°F | 1 mph S (180°) | 7 mph | 22% | 45% | Slight Chance Light Rain |
| Sat, 5 AM PDT | 46°F | 1 mph SSE (158°) | 6 mph | 9% | 62% | Mostly Cloudy |
| Sat, 6 AM PDT | 46°F | 1 mph SSE (158°) | 6 mph | 10% | 62% | Partly Sunny |
| Sat, 7 AM PDT | 45°F | 1 mph SSE (158°) | 6 mph | 7% | 62% | Partly Sunny |
| Sat, 8 AM PDT | 46°F | Calm | 2 mph | 6% | 69% | Partly Sunny |
| Sat, 9 AM PDT | 47°F | Calm | 2 mph | 2% | 69% | Partly Sunny |
Official National Weather Service hourly forecast. Showing 10 of 25 hours. Wind arrows point the way the wind is blowing; the compass point and degrees show where it comes from.
| Period | Today October 9, 2026 | Tonight October 9, 2026 | Saturday October 10, 2026 | Saturday Night October 10, 2026 | Sunday October 11, 2026 | Sunday Night October 11, 2026 | Columbus Day October 12, 2026 | Monday Night October 12, 2026 | Tuesday October 13, 2026 | Tuesday Night October 13, 2026 | Wednesday October 14, 2026 | Wednesday Night October 14, 2026 | Thursday October 15, 2026 | Thursday Night October 15, 2026 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp (°F) | 62° | 45° | 60° | 41° | 63° | 40° | 65° | 42° | 63° | 48° | 63° | 46° | 66° | 46° |
| Wind | NNE 1 to 7 mph | SE 2 mph | W 0 to 5 mph | N 0 to 5 mph | N 0 to 5 mph | N 0 to 3 mph | N 1 mph | 0 mph | S 1 mph | S 2 mph | SSW 1 mph | 0 mph | N 1 mph | NNE 1 mph |
| Gusts | 21 mph | 9 mph | 9 mph | 9 mph | 10 mph | 9 mph | 2 mph | 4 mph | 5 mph | 9 mph | 8 mph | 2 mph | 4 mph | 4 mph |
| Precip % | 70% | 43% | 10% | 0% | 0% | 0% | 0% | 2% | 23% | 52% | 42% | 14% | 3% | 4% |
| Forecast |
Nearby river temperature: 57.4°F at DUWAMISH RIVER AT GOLF COURSE AT TUKWILA, WA (13.8 mi away) · Oct 9, 3:45 PM UTC
Good for fishing (77/100), from 5 available inputs. Supporting this: Wind 7 mph from the southwest. Morning hours (09:00 local). Working against it: 70% chance of precipitation is likely. Not available from a verified source for this lake: pressure trend, water temperature. Confidence is moderate (74%) because some inputs are unavailable or older than ideal.
Good for boating (76/100), from 4 available inputs. Supporting this: Wind 7 mph from the southwest. No active official alerts for this lake. Working against it: 70% chance of precipitation is likely. Not available from a verified source for this lake: visibility and conditions, verified water access. Confidence is moderate (84%) because some inputs are unavailable or older than ideal.
Fair for sailing (71/100), from 4 available inputs. Supporting this: Wind 7 mph from the SW is workable but not ideal. No active official alerts for this lake. Working against it: 70% chance of precipitation is likely. Not available from a verified source for this lake: visibility. Confidence is high (88%).
Good for kayaking (76/100), from 5 available inputs. Supporting this: Wind 7 mph from the southwest. No active official alerts for this lake. Working against it: 70% chance of precipitation is likely. Confidence is high (90%).
Water temperature is not available from a verified source for this lake. No swimming score is shown without it.
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Individual boat ramp GPS coordinates are maintained under the jurisdiction of WA Parks & Wildlife Authority. Public boaters should verify seasonal launch water levels, gate hours, and daily vehicle/vessel fees before traveling.
Nestled in WA, Lake Sammamish is an attractive freshwater lake celebrated for its open water, scenic shoreline, and productive sport fishery. From spring pre-spawn fishing to peak summer watersports, the lake remains a popular regional destination. Keep watercraft clean, drained, and dry to safeguard this aquatic resource.
Valid freshwater sport fishing license issued by Washington Department of Fish and Wildlife (WDFW) is required for anglers age 15+. Digital license on mobile is accepted.
Mandatory Clean, Drain & Dry inspection. Out-of-area craft require on-site Aquatic Invasive Species (AIS Quagga/Zebra) inspection or decontamination before launch. USCG life jackets required for all.
Public shoreline and boating access managed by State & Local Authorities. Verify seasonal gate hours, launch fees, and parking rules before travel.
High-speed motorboating, pontoon cruising, wakeboarding, and water skiing across main channels. Target gamefish include Chinook Salmon, Pumpkinseed Sunfish, Coho Salmon, Common Carp. Morning hours typically provide optimal glassy conditions for kayak and stand-up paddleboard (SUP) touring.
Warm water temperatures, peak swimming, active watersports, and open full-service campgrounds. Highest weekly attendance; plan early arrivals on summer weekends.
Spring pre-spawn and fall feeding transitions create prime trophy angling conditions. Cooler air, lower boat traffic, and vibrant seasonal shoreline foliage.
Mild year-round outdoor climate. Uncrowded waters, active winter bass and crappie fishing, and open year-round boat launch access.
No external source rows are cited by the data currently shown on this page.
Updated
Scores are heuristics, not safety guarantees. LakeRadar scores summarize available conditions and are not a substitute for official warnings, local rules, or on-water judgment.
All telemetry for Lake Sammamish is synchronized directly from authorized federal and state monitoring networks (USGS, NWS, NOAA, and state environmental authorities). Observations are strictly instrumented readings — unmonitored sensors are transparently disclosed rather than synthetic estimates.
Last source audit: Oct 9, 9:45 AM PDT