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Official National Weather Service (NWS) point forecast and real-time wind conditions for Harrison Slough (Idaho). 24-hour hour-by-hour wind timelines, peak gusts, watercraft recreation safety thresholds, and 7-day marine outlook.
Today: High 49°F · Low 36°F
Peak gusts: 29 mph · Lake surface chop expected
Humidity: 53% · Barometer: 29.96 inHg
USGS water monitoring available for Harrison Slough.
Good for boating (83/100), from 4 available inputs. Supporting this: No active official alerts for this lake. Wind 10 mph from the northeast. 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 (77/100), from 5 available inputs. Supporting this: Wind 10 mph from the northeast. 16% 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.
Good for kayaking (81/100), from 5 available inputs. Supporting this: Wind 10 mph from the northeast. No active official alerts for this lake. 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 10 mph from the northeast. Working against it: Air temperature 47°F. Not available from a verified source for this lake: water temperature.
| Time | Air Temp | Wind (mph) | Direction | Peak Gusts | Rain Chance | Sky & Conditions |
|---|---|---|---|---|---|---|
| 3 PM | 47°F | 10 mph | NE | ⚡ 18 mph | 16% | Slight Chance Rain Showers |
| 4 PM | 48°F | 10 mph | NE | ⚡ 18 mph | 16% | Slight Chance Rain Showers |
| 5 PM | 48°F | 9 mph | NE | ⚡ 17 mph | 0% | Mostly Cloudy |
| 6 PM | 49°F | 8 mph | NE | ⚡ 17 mph | 0% | Mostly Cloudy |
| 7 PM | 48°F | 8 mph | NE | ⚡ 17 mph | 0% | Mostly Cloudy |
| 8 PM | 47°F | 7 mph | NE | ⚡ 16 mph | 0% | Mostly Cloudy |
| 9 PM | 45°F | 7 mph | NE | ⚡ 16 mph | 0% | Partly Cloudy |
| 10 PM | 44°F | 6 mph | NE | ⚡ 21 mph | 0% | Mostly Cloudy |
| 11 PM | 43°F | 6 mph | NE | ⚡ 13 mph | 2% | Mostly Cloudy |
| 12 AM | 42°F | 6 mph | NE | ⚡ 10 mph | 2% | Mostly Cloudy |
| 1 AM | 42°F | 6 mph | NE | ⚡ 9 mph | 2% | Mostly Cloudy |
| 2 AM | 41°F | 5 mph | NE | ⚡ 9 mph | 2% | Partly Cloudy |
| 3 AM | 40°F | 5 mph | NE | ⚡ 8 mph | 2% | Mostly Cloudy |
| 4 AM | 40°F | 5 mph | NE | ⚡ 7 mph | 2% | Partly Cloudy |
| 5 AM | 38°F | 3 mph | NE | ⚡ 7 mph | 3% | Areas Of Frost |
| 6 AM | 37°F | 3 mph | NE | ⚡ 6 mph | 3% | Widespread Frost |
| 7 AM | 37°F | 2 mph | NE | ⚡ 6 mph | 3% | Widespread Frost |
| 8 AM | 36°F | 2 mph | NE | ⚡ 7 mph | 3% | Widespread Frost |
| 9 AM | 39°F | 3 mph | NE | ⚡ 8 mph | 3% | Areas Of Frost |
| 10 AM | 43°F | 2 mph | NE | ⚡ 8 mph | 3% | Mostly Sunny |
| 11 AM | 47°F | 2 mph | NE | ⚡ 8 mph | 1% | Mostly Sunny |
| 12 PM | 50°F | 2 mph | NE | ⚡ 7 mph | 1% | Sunny |
| 1 PM | 51°F | 2 mph | NE | ⚡ 7 mph | 1% | Sunny |
| 2 PM | 54°F | 2 mph | NW | ⚡ 7 mph | 1% | 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.
A slight chance of rain showers before 5pm. Mostly cloudy, with a high near 49. Northeast wind around 10 mph, with gusts as high as 18 mph. Chance of precipitation is 20%.
Areas of frost after 5am. Mostly cloudy. Low around 36, with temperatures rising to around 38 overnight. Northeast wind 3 to 8 mph, with gusts as high as 21 mph.
Widespread frost before 10am. Mostly sunny, with a high near 55. North wind around 3 mph.
Widespread frost after 2am. Mostly clear, with a low around 31. South wind around 1 mph.
Widespread frost before 10am. Sunny, with a high near 58. South wind around 2 mph.
Areas of frost after 5am. Mostly clear, with a low around 35.
Areas of frost before 9am. Mostly sunny, with a high near 60.
Mostly clear, with a low around 38.
Sunny, with a high near 67.
Mostly clear, with a low around 39.
Sunny, with a high near 71.
Mostly clear, with a low around 44.
Mostly sunny, with a high near 67.
Partly cloudy, with a low around 42.
Harrison Slough currently reports 44°F with wind velocity near 10 mph from the NE. 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 Harrison Slough 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 OTX) high-resolution numerical point-forecast API. LakeRadar uses the official gridpoint for Harrison Slough 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 Harrison Slough Water Level & Temperature page.
View Harrison Slough Water Level & Temperature →