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Official National Weather Service (NWS) point forecast and real-time wind conditions for Lake Sammamish (Washington). 24-hour hour-by-hour wind timelines, peak gusts, watercraft recreation safety thresholds, and 7-day marine outlook.
Today: High 59°F · Low 41°F
Peak gusts: 3 mph · Lake surface chop expected
Humidity: 84% · Barometer: 30.05 inHg
USGS water monitoring available for Lake Sammamish.
Excellent for boating (99/100), from 4 available inputs. Supporting this: Wind 1 mph from the east. Gusts to 4 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.
Good for fishing (79/100), from 5 available inputs. Supporting this: Wind 1 mph from the east. 2% chance of precipitation. 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.
Excellent for kayaking (96/100), from 5 available inputs. Supporting this: Wind 1 mph from the east. Gusts to 4 mph. Confidence is high (90%).
Water temperature is not available from a verified source for this lake. No swimming score is shown without it. Supporting this: No active official alerts for this lake. Wind 1 mph from the east. Working against it: Air temperature 44°F. Not available from a verified source for this lake: water temperature.
| Time | Air Temp | Wind (mph) | Direction | Peak Gusts | Rain Chance | Sky & Conditions |
|---|---|---|---|---|---|---|
| 2 AM | 44°F | 1 mph | E | ⚡ 4 mph | 2% | Mostly Clear |
| 3 AM | 43°F | 1 mph | E | ⚡ 5 mph | 2% | Clear |
| 4 AM | 42°F | 1 mph | E | ⚡ 4 mph | 2% | Clear |
| 5 AM | 41°F | 1 mph | E | ⚡ 4 mph | 2% | Clear |
| 6 AM | 41°F | 1 mph | E | ⚡ 4 mph | 2% | Sunny |
| 7 AM | 41°F | 1 mph | E | ⚡ 4 mph | 1% | Sunny |
| 8 AM | 41°F | 1 mph | E | ⚡ 5 mph | 1% | Sunny |
| 9 AM | 43°F | 1 mph | E | ⚡ 5 mph | 1% | Sunny |
| 10 AM | 48°F | 1 mph | N | ⚡ 2 mph | 1% | Sunny |
| 11 AM | 51°F | 1 mph | N | ⚡ 4 mph | 1% | Sunny |
| 12 PM | 54°F | 2 mph | N | ⚡ 6 mph | 0% | Sunny |
| 1 PM | 57°F | 3 mph | N | ⚡ 8 mph | 0% | Sunny |
| 2 PM | 59°F | 5 mph | N | ⚡ 10 mph | 0% | Sunny |
| 3 PM | 59°F | 5 mph | N | ⚡ 10 mph | 0% | Sunny |
| 4 PM | 59°F | 5 mph | N | ⚡ 9 mph | 0% | Sunny |
| 5 PM | 57°F | 3 mph | N | ⚡ 8 mph | 0% | Sunny |
| 6 PM | 56°F | 2 mph | N | ⚡ 5 mph | 0% | Clear |
| 7 PM | 53°F | 1 mph | N | ⚡ 4 mph | 0% | Clear |
| 8 PM | 49°F | 1 mph | NE | ⚡ 2 mph | 0% | Mostly Clear |
| 9 PM | 48°F | 0 mph | — | ⚡ 1 mph | 0% | Mostly Clear |
| 10 PM | 47°F | 0 mph | — | ⚡ 1 mph | 0% | Mostly Clear |
| 11 PM | 46°F | 0 mph | — | ⚡ 2 mph | 0% | Clear |
| 12 AM | 45°F | 0 mph | — | ⚡ 2 mph | 0% | Clear |
| 1 AM | 44°F | 0 mph | — | ⚡ 2 mph | 0% | Clear |
Mirror-like to gentle rippled water. Optimal conditions for paddleboarding, kayaking, swimming, and beginner water skiing or wakeboarding.
Pleasant breeze with small wavelets. Great for sailing, pleasure cruising, pontoon boats, and trolling for trout and bass.
Moderate waves with whitecaps likely. Requires skilled boat handling; kayaks, canoes, and stand-up paddleboards should stay close to sheltered bays.
Steep waves, cold spray, and hazardous open water. Avoid small craft voyages. Always check official National Weather Service lake wind advisories.
Mostly clear, with a low around 41. East wind around 1 mph.
Sunny. High near 59, with temperatures falling to around 57 in the afternoon. North northeast wind 1 to 5 mph.
Clear, with a low around 40. Northeast wind around 2 mph.
Sunny, with a high near 61. North wind around 1 mph.
Mostly clear, with a low around 42. East southeast wind around 1 mph.
Partly sunny, with a high near 62.
Mostly cloudy, with a low around 48.
Partly sunny, with a high near 64.
Mostly cloudy, with a low around 46.
Mostly sunny, with a high near 68.
Partly cloudy, with a low around 48.
Mostly sunny, with a high near 71.
A chance of rain after 11pm. Partly cloudy, with a low around 51.
A chance of rain. Partly sunny, with a high near 64.
Lake Sammamish currently reports 51°F with wind velocity near 3 mph from the SE. Atmospheric forecasts and 24-hour hour-by-hour wind timelines are updated hourly from the National Weather Service gridpoint matching the lake's coordinates.
At Lake Sammamish and surrounding mountain valleys, diurnal heating of the surrounding terrain causes strong thermal pressure differentials known locally as afternoon breezes (such as the Washoe Zephyr at Lake Tahoe). Wind speeds typically peak between 1:00 PM and 5:00 PM before calming near sunset.
For stand-up paddleboarding (SUP), canoeing, and light kayaks, winds under 7 mph (light breeze) offer the safest, glassiest surface conditions. Between 8–14 mph, small wavelets develop, suitable for sailboats and powerboats. Winds exceeding 15 mph create steep whitecaps and rapid drift; winds over 21 mph warrant small craft warnings.
All weather and wind telemetry is fetched directly from the National Weather Service (NOAA - WFO SEW) high-resolution numerical point-forecast API. LakeRadar uses the official gridpoint for Lake Sammamish without artificial smoothing or third-party estimates.
Yes. Live hydrological sensor readings, 30-day elevation histories, full-pool benchmarks, and USGS station provenance are available on our dedicated Lake Sammamish Water Level & Temperature page.
View Lake Sammamish Water Level & Temperature →