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In Washington, Lake Sammamish is a lake used for time on and around the water. At around 4,897 acres (about 8 square miles), it is a mid-sized waterbody. Sitting at around 30 feet of elevation, it drops to a maximum depth near 105 feet. Fish documented in the area include Common Carp, Chinook Salmon, Yellow Perch, and Pumpkinseed Sunfish. LakeRadar pulls readings from a mapped water gauge, so current water data is shown when the station reports. Nearby alternatives include Lake Sammamish, Lake Washington, and Lake Tapps. For this location, LakeRadar tracks an hourly and 7-day forecast, wind and gust outlook, water readings, fishing conditions, 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, 1:13 AM PDT). Alerts are re-checked automatically; see the official source for updates.
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 | 8a | 9a | 10a | 11a | 12p | 1p | 2p | 3p | 4p | 5p | 6p | 7p | 8p | 9p | 10p | 11p | 12a | 1a | 2a | 3a | 4a | 5a | 6a | 7a |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp (°F) | 54° | 54° | 54° | 55° | 55° | 55° | 54° | 56° | 55° | 56° | 57° | 57° | 58° | 59° | 58° | 58° | 57° | 55° | 53° | 53° | 51° | 51° | 50° | 49° |
| Wind (kts) | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 7 | 7 | 5 | 3 | 3 | 2 | 2 | 2 | 2 | 2 | 1 | 1 | 2 | 2 | 2 | 2 | 3 |
| Direction | SE | S | S | S | S | S | SW | SW | SW | SW | N | N | N | NE | NE | NE | NE | E | E | E | SE | SE | SE | S |
| Gusts (kts) | 3 | 5 | 9 | 13 | 16 | 17 | 19 | 19 | 18 | 14 | 11 | 9 | 8 | 6 | 5 | 5 | 5 | 4 | 4 | 5 | 6 | 6 | 7 | 8 |
| Precip % | 0% | 0% | 1% | 2% | 20% | 37% | 84% | 81% | 69% | 45% | 59% | 65% | 58% | 31% | 30% | 32% | 46% | 38% | 36% | 44% | 43% | 34% | 17% | 15% |
| Time | Temp | Wind | Gusts | Precip | Cloud | Condition |
|---|---|---|---|---|---|---|
| Fri, 1 AM PDT | 54°F | 1 mph ESE (113°) | 4 mph | 0% | 60% | Mostly Cloudy |
| Fri, 2 AM PDT | 54°F | 2 mph SSE (158°) | 6 mph | 0% | 66% | Mostly Cloudy |
| Fri, 3 AM PDT | 54°F | 3 mph SSE (158°) | 10 mph | 1% | 73% | Mostly Cloudy |
| Fri, 4 AM PDT | 55°F | 5 mph S (180°) | 15 mph | 2% | 85% | Mostly Cloudy |
| Fri, 5 AM PDT | 55°F | 6 mph S (180°) | 18 mph | 20% | 88% | Slight Chance Light Rain |
| Fri, 6 AM PDT | 55°F | 7 mph S (180°) | 20 mph | 37% | 89% | Chance Light Rain |
| Fri, 7 AM PDT | 54°F | 8 mph SSW (203°) | 22 mph | 84% | 95% | Light Rain |
| Fri, 8 AM PDT | 56°F | 8 mph SSW (203°) | 22 mph | 81% | 93% | Light Rain |
| Fri, 9 AM PDT | 55°F | 8 mph SW (225°) | 21 mph | 69% | 89% | Light Rain Likely |
| Fri, 10 AM PDT | 56°F | 6 mph SSW (203°) | 16 mph | 45% | 87% | Chance Light Rain |
| Fri, 11 AM PDT | 57°F | 3 mph N (0°) | 13 mph | 59% | 77% | Light Rain Likely |
| Fri, 12 PM PDT | 57°F | 3 mph N (0°) | 10 mph | 65% | 77% | Light Rain Likely |
| Fri, 1 PM PDT | 58°F | 2 mph N (0°) | 9 mph | 58% | 72% | Light Rain Likely |
| Fri, 2 PM PDT | 59°F | 2 mph NNE (23°) | 7 mph | 31% | 69% | Chance Light Rain |
| Fri, 3 PM PDT | 58°F | 2 mph NNE (23°) | 6 mph | 30% | 83% | Chance Light Rain |
| Fri, 4 PM PDT | 58°F | 2 mph NE (45°) | 6 mph | 32% | 83% | Chance Light Rain |
| Fri, 5 PM PDT | 57°F | 2 mph NE (45°) | 6 mph | 46% | 81% | Chance Light Rain |
| Fri, 6 PM PDT | 55°F | 1 mph ENE (68°) | 5 mph | 38% | 81% | Chance Light Rain |
| Fri, 7 PM PDT | 53°F | 1 mph E (90°) | 5 mph | 36% | 88% | Chance Light Rain |
| Fri, 8 PM PDT | 53°F | 2 mph E (90°) | 6 mph | 44% | 88% | Chance Light Rain |
| Fri, 9 PM PDT | 51°F | 2 mph ESE (113°) | 7 mph | 43% | 82% | Chance Light Rain |
| Fri, 10 PM PDT | 51°F | 2 mph SE (135°) | 7 mph | 34% | 75% | Chance Light Rain |
| Fri, 11 PM PDT | 50°F | 2 mph SE (135°) | 8 mph | 17% | 72% | Slight Chance Light Rain |
| Sat, 12 AM PDT | 49°F | 3 mph SSE (158°) | 9 mph | 15% | 71% | Slight Chance Light Rain |
| Sat, 1 AM PDT | 48°F | 3 mph SSE (158°) | 9 mph | 17% | 48% | Slight Chance Light Rain |
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 | Overnight October 9, 2026 | Friday October 9, 2026 | Friday Night 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp (°F) | 53° | 60° | 45° | 59° | 41° | 61° | 40° | 63° | 42° | 61° | 48° | 62° | 45° | 65° |
| Wind | SSE 1 to 6 mph | SW 2 to 8 mph | SE 3 mph | W 0 to 5 mph | NNE 0 to 5 mph | N 0 to 5 mph | N 0 to 5 mph | N 1 mph | 0 mph | S 1 mph | S 2 mph | SSW 2 mph | 0 mph | N 1 mph |
| Gusts | 18 mph | 22 mph | 9 mph | 9 mph | 9 mph | 10 mph | 9 mph | 2 mph | 4 mph | 5 mph | 10 mph | 9 mph | 4 mph | 4 mph |
| Precip % | 20% | 84% | 44% | 10% | 0% | 0% | 0% | 0% | 2% | 23% | 52% | 42% | 14% | 3% |
| Forecast |
Nearby river temperature: 55.0°F at CEDAR RIVER AT RENTON, WA (12.1 mi away) · Oct 9, 7:15 AM UTC
Good for fishing (85/100), from 6 available inputs. Supporting this: Wind 0 mph from the north-northeast. Dawn hours (06:00 local). Not available from a verified source for this lake: pressure trend. Confidence is moderate (81%) because some inputs are unavailable or older than ideal.
Excellent for boating (100/100), from 4 available inputs. Supporting this: Wind 0 mph from the north-northeast. Gusts to 1 mph. 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 (64/100), from 4 available inputs. Supporting this: Gusts are within 1 mph of sustained wind, so the breeze is steady. No active official alerts for this lake. Working against it: Wind 0 mph is light; expect limited sailing. Not available from a verified source for this lake: visibility. Confidence is high (88%).
Fair for kayaking (73/100), from 5 available inputs. Supporting this: Wind 0 mph from the north-northeast. Gusts to 1 mph. Water temperature is 53°F (combined air+water: 104°F). Cold shock hazard: sudden immersion below 55°F poses serious risk. Confidence is high (90%).
No verified water temperature source exists for this lake, so a swimming comfort score is not shown.
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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.
Surrounded by the natural landscapes of WA, Lake Sammamish is an appealing freshwater lake welcoming outdoor recreation across all seasons. The lake provides critical habitat for native fish species and serves as a focal point for regional boating. Visitors should review current access fees, ramp operational status, and state licensing rules.
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 Common Carp, Chinook Salmon, Yellow Perch, Pumpkinseed Sunfish. 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, 1:13 AM PDT