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Official National Weather Service (NWS) point forecast and real-time wind conditions for Sylvan Lake (South Dakota). 24-hour hour-by-hour wind timelines, peak gusts, watercraft recreation safety thresholds, and 7-day marine outlook.
Today: High 61°F · Low 51°F
Peak gusts: 22 mph · Lake surface chop expected
Humidity: 25% · Barometer: 30.05 inHg
USGS water monitoring available for Sylvan Lake.
Excellent for boating (95/100), from 4 available inputs. Supporting this: Wind 6 mph from the west. Gusts to 7 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.
Excellent for fishing (92/100), from 5 available inputs. Supporting this: Wind 6 mph from the west. Sky is mostly cloudy (46% cloud cover). 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 (95/100), from 5 available inputs. Supporting this: Wind 6 mph from the west. Gusts to 7 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 6 mph from the west. Not available from a verified source for this lake: water temperature.
| Time | Air Temp | Wind (mph) | Direction | Peak Gusts | Rain Chance | Sky & Conditions |
|---|---|---|---|---|---|---|
| 9 PM | 59°F | 6 mph | W | ⚡ 7 mph | 14% | Partly Cloudy |
| 10 PM | 58°F | 7 mph | SW | ⚡ 22 mph | 14% | Partly Cloudy |
| 11 PM | 59°F | 8 mph | SW | ⚡ 20 mph | 14% | Partly Cloudy |
| 12 AM | 58°F | 8 mph | W | ⚡ 13 mph | 7% | Partly Cloudy |
| 1 AM | 58°F | 8 mph | W | ⚡ 17 mph | 7% | Mostly Cloudy |
| 2 AM | 57°F | 8 mph | W | ⚡ 15 mph | 7% | Mostly Cloudy |
| 3 AM | 56°F | 7 mph | W | ⚡ 14 mph | 3% | Mostly Cloudy |
| 4 AM | 55°F | 6 mph | W | ⚡ 15 mph | 3% | Mostly Cloudy |
| 5 AM | 53°F | 3 mph | W | ⚡ 14 mph | 3% | Mostly Cloudy |
| 6 AM | 52°F | 6 mph | W | ⚡ 14 mph | 5% | Mostly Cloudy |
| 7 AM | 51°F | 5 mph | W | ⚡ 13 mph | 5% | Cloudy |
| 8 AM | 52°F | 3 mph | W | ⚡ 13 mph | 5% | Mostly Cloudy |
| 9 AM | 55°F | 3 mph | W | ⚡ 13 mph | 4% | Partly Sunny |
| 10 AM | 58°F | 3 mph | SW | ⚡ 13 mph | 4% | Partly Sunny |
| 11 AM | 59°F | 3 mph | SW | ⚡ 14 mph | 4% | Partly Sunny |
| 12 PM | 60°F | 3 mph | SW | ⚡ 15 mph | 3% | Partly Sunny |
| 1 PM | 61°F | 3 mph | SW | ⚡ 16 mph | 3% | Partly Sunny |
| 2 PM | 61°F | 3 mph | SW | ⚡ 17 mph | 3% | Partly Sunny |
| 3 PM | 61°F | 5 mph | SW | ⚡ 17 mph | 5% | Partly Sunny |
| 4 PM | 59°F | 5 mph | S | ⚡ 17 mph | 5% | Partly Sunny |
| 5 PM | 54°F | 5 mph | SE | ⚡ 17 mph | 5% | Mostly Sunny |
| 6 PM | 50°F | 6 mph | E | ⚡ 16 mph | 30% | Chance Rain Showers |
| 7 PM | 47°F | 6 mph | E | ⚡ 16 mph | 30% | Chance Rain Showers |
| 8 PM | 45°F | 6 mph | E | ⚡ 16 mph | 30% | Chance Rain Showers |
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 cloudy. Low around 51, with temperatures rising to around 53 overnight. West wind 3 to 8 mph, with gusts as high as 22 mph.
Partly sunny. High near 62, with temperatures falling to around 54 in the afternoon. Southwest wind around 6 mph, with gusts as high as 17 mph.
A chance of rain showers. Mostly cloudy. Low around 41, with temperatures rising to around 43 overnight. Southeast wind around 6 mph, with gusts as high as 16 mph. Chance of precipitation is 40%.
Mostly sunny. High near 59, with temperatures falling to around 53 in the afternoon. Southwest wind around 6 mph, with gusts as high as 22 mph.
A chance of rain. Mostly cloudy, with a low around 37. West wind around 5 mph, with gusts as high as 16 mph. Chance of precipitation is 40%.
A chance of rain. Partly sunny. High near 50, with temperatures falling to around 47 in the afternoon. Southeast wind around 3 mph, with gusts as high as 16 mph. Chance of precipitation is 30%.
A chance of rain. Mostly cloudy, with a low around 35.
Rain likely. Mostly cloudy, with a high near 46.
Rain likely. Mostly cloudy, with a low around 35.
A chance of rain. Partly sunny, with a high near 50.
A slight chance of rain before 9pm, then a slight chance of rain and snow between 9pm and midnight. Partly cloudy, with a low around 33.
Mostly sunny, with a high near 50.
Mostly clear, with a low around 33.
Sunny, with a high near 59.
Sylvan Lake currently reports 72°F with wind velocity near 12 mph from the W. 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 Sylvan Lake 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 UNR) high-resolution numerical point-forecast API. LakeRadar uses the official gridpoint for Sylvan Lake 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 Sylvan Lake Water Level & Temperature page.
View Sylvan Lake Water Level & Temperature →