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Official National Weather Service (NWS) point forecast and real-time wind conditions for Lake Merwin (Washington). 24-hour hour-by-hour wind timelines, peak gusts, watercraft recreation safety thresholds, and 7-day marine outlook.
Frost Advisory issued October 11 at 1:01AM PDT until October 11 at 9:00AM PDT by NWS Portland OR
Today: High 62°F · Low 39°F
Peak gusts: 1 mph · Lake surface chop expected
Humidity: 66% · Barometer: 30.02 inHg
USGS water monitoring available for Lake Merwin.
Frost Advisory issued October 11 at 1:01AM PDT until October 11 at 9:00AM PDT by NWS Portland OR
Good for boating (88/100), from 4 available inputs. Supporting this: Wind 2 mph from the north-northeast. Gusts to 6 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 (87/100), from 5 available inputs. Supporting this: Wind 2 mph from the north-northeast. Morning hours (08:00 local). Working against it: Air temperature 39°F. 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 kayaking (87/100), from 5 available inputs. Supporting this: Wind 2 mph from the north-northeast. Gusts to 6 mph. Working against it: Air temperature 39°F. 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: 1% chance of precipitation. Wind 2 mph from the north-northeast. Working against it: Air temperature 39°F. Not available from a verified source for this lake: water temperature.
| Time | Air Temp | Wind (mph) | Direction | Peak Gusts | Rain Chance | Sky & Conditions |
|---|---|---|---|---|---|---|
| 8 AM | 39°F | 2 mph | NE | ⚡ 6 mph | 1% | Sunny |
| 9 AM | 42°F | 1 mph | NE | ⚡ 5 mph | 1% | Sunny |
| 10 AM | 51°F | 0 mph | — | ⚡ 4 mph | 1% | Sunny |
| 11 AM | 56°F | 0 mph | — | ⚡ 4 mph | 1% | Sunny |
| 12 PM | 58°F | 1 mph | W | ⚡ 5 mph | 1% | Sunny |
| 1 PM | 60°F | 2 mph | NW | ⚡ 6 mph | 1% | Sunny |
| 2 PM | 62°F | 3 mph | N | ⚡ 7 mph | 1% | Sunny |
| 3 PM | 62°F | 3 mph | N | ⚡ 8 mph | 1% | Sunny |
| 4 PM | 62°F | 5 mph | N | ⚡ 10 mph | 1% | Sunny |
| 5 PM | 60°F | 5 mph | N | ⚡ 10 mph | 1% | Sunny |
| 6 PM | 58°F | 2 mph | N | ⚡ 8 mph | 0% | Clear |
| 7 PM | 56°F | 2 mph | N | ⚡ 7 mph | 0% | Clear |
| 8 PM | 51°F | 1 mph | NE | ⚡ 6 mph | 0% | Mostly Clear |
| 9 PM | 49°F | 1 mph | NE | ⚡ 5 mph | 0% | Clear |
| 10 PM | 47°F | 1 mph | NE | ⚡ 4 mph | 0% | Mostly Clear |
| 11 PM | 46°F | 1 mph | NE | ⚡ 4 mph | 0% | Clear |
| 12 AM | 45°F | 1 mph | NE | ⚡ 4 mph | 0% | Mostly Clear |
| 1 AM | 44°F | 1 mph | NE | ⚡ 4 mph | 0% | Clear |
| 2 AM | 44°F | 1 mph | NE | ⚡ 4 mph | 0% | Mostly Clear |
| 3 AM | 43°F | 1 mph | NE | ⚡ 4 mph | 0% | Clear |
| 4 AM | 43°F | 0 mph | — | ⚡ 2 mph | 0% | Clear |
| 5 AM | 41°F | 1 mph | E | ⚡ 4 mph | 0% | Mostly Clear |
| 6 AM | 41°F | 1 mph | E | ⚡ 4 mph | 0% | Sunny |
| 7 AM | 40°F | 1 mph | E | ⚡ 4 mph | 0% | Sunny |
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.
Sunny. High near 62, with temperatures falling to around 60 in the afternoon. North northwest wind 0 to 5 mph.
Mostly clear. Low around 39, with temperatures rising to around 41 overnight. North northeast wind around 2 mph.
Sunny. High near 64, with temperatures falling to around 62 in the afternoon. West northwest wind around 2 mph.
Mostly clear, with a low around 39. North northwest wind around 2 mph.
Mostly sunny, with a high near 63. West wind around 1 mph.
Mostly cloudy, with a low around 45.
Partly sunny, with a high near 67.
Partly cloudy, with a low around 47.
Mostly sunny, with a high near 74.
Mostly clear, with a low around 52.
Sunny, with a high near 74.
A slight chance of rain after 11pm. Partly cloudy, with a low around 49.
A slight chance of rain before 5pm. Partly sunny, with a high near 65.
Mostly cloudy, with a low around 46.
Lake Merwin currently reports 42°F with wind velocity near 1 mph from the E. 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 Merwin 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 PQR) high-resolution numerical point-forecast API. LakeRadar uses the official gridpoint for Lake Merwin 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 Merwin Water Level & Temperature page.
View Lake Merwin Water Level & Temperature →