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Official National Weather Service (NWS) point forecast and real-time wind conditions for Lake Hartwell (South Carolina). 24-hour hour-by-hour wind timelines, peak gusts, watercraft recreation safety thresholds, and 7-day marine outlook.
Wind Advisory issued October 9 at 5:19PM EDT until October 11 at 8:00AM EDT by NWS Greenville-Spartanburg SC
Today: High 74°F · Low 63°F
Peak gusts: 18 mph · Lake surface chop expected
Humidity: 30% · Barometer: 30.09 inHg
Live hydrological sensor reading for Lake Hartwell.
Wind Advisory issued October 9 at 5:19PM EDT until October 11 at 8:00AM EDT by NWS Greenville-Spartanburg SC
Very Poor / Avoid for boating (30/100), from 4 available inputs. Supporting this: Wind 14 mph from the east-northeast. 1% chance of precipitation. Working against it: Active moderate alert: Wind Advisory. Wind Advisory is in effect for this lake. Boating scores are capped at 30. 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 (81/100), from 6 available inputs. Supporting this: Measured water temperature 77°F. Provisional data. 1% chance of precipitation. Not available from a verified source for this lake: pressure trend. Confidence is moderate (73%) because some inputs are unavailable or older than ideal.
Very Poor / Avoid for kayaking (30/100), from 5 available inputs. Supporting this: Wind 14 mph from the east-northeast. 1% chance of precipitation. Working against it: Active moderate alert: Wind Advisory. Wind Advisory is in effect for this lake. Kayaking scores are capped at 30. Confidence is high (90%).
Fair for swimming (68/100), from 5 available inputs. Supporting this: Measured water temperature 77°F. Provisional data. 1% chance of precipitation. Working against it: Active moderate alert: Wind Advisory. Confidence is moderate (77%) because some inputs are unavailable or older than ideal.
| Time | Air Temp | Wind (mph) | Direction | Peak Gusts | Rain Chance | Sky & Conditions |
|---|---|---|---|---|---|---|
| 6 PM | 74°F | 12 mph | E | ⚡ 21 mph | 3% | Cloudy |
| 7 PM | 74°F | 13 mph | E | ⚡ 20 mph | 3% | Cloudy |
| 8 PM | 72°F | 14 mph | NE | ⚡ 23 mph | 9% | Cloudy |
| 9 PM | 71°F | 15 mph | E | ⚡ 23 mph | 11% | Cloudy |
| 10 PM | 71°F | 15 mph | E | ⚡ 23 mph | 16% | Slight Chance Rain Showers |
| 11 PM | 70°F | 15 mph | NE | ⚡ 24 mph | 24% | Slight Chance Rain Showers |
| 12 AM | 68°F | 17 mph | E | ⚡ 25 mph | 23% | Slight Chance Rain Showers |
| 1 AM | 67°F | 17 mph | E | ⚡ 28 mph | 27% | Chance Rain Showers |
| 2 AM | 66°F | 18 mph | NE | ⚡ 30 mph | 35% | Chance Rain Showers |
| 3 AM | 65°F | 20 mph | NE | ⚡ 31 mph | 45% | Chance Rain Showers |
| 4 AM | 64°F | 21 mph | NE | ⚡ 32 mph | 54% | Chance Rain Showers |
| 5 AM | 64°F | 21 mph | NE | ⚡ 33 mph | 62% | Rain Showers Likely |
| 6 AM | 63°F | 22 mph | NE | ⚡ 35 mph | 67% | Rain Showers Likely |
| 7 AM | 63°F | 22 mph | E | ⚡ 35 mph | 84% | Rain Showers |
| 8 AM | 63°F | 23 mph | E | ⚡ 33 mph | 87% | Showers And Thunderstorms |
| 9 AM | 63°F | 23 mph | E | ⚡ 37 mph | 90% | Patchy Fog |
| 10 AM | 63°F | 23 mph | E | ⚡ 38 mph | 93% | Patchy Fog |
| 11 AM | 63°F | 22 mph | E | ⚡ 37 mph | 97% | Patchy Fog |
| 12 PM | 64°F | 24 mph | E | ⚡ 39 mph | 87% | Patchy Fog |
| 1 PM | 64°F | 23 mph | E | ⚡ 39 mph | 85% | Patchy Fog |
| 2 PM | 66°F | 22 mph | E | ⚡ 38 mph | 98% | Patchy Fog |
| 3 PM | 66°F | 22 mph | E | ⚡ 38 mph | 98% | Patchy Fog |
| 4 PM | 67°F | 22 mph | E | ⚡ 37 mph | 89% | Patchy Fog |
| 5 PM | 69°F | 21 mph | E | ⚡ 36 mph | 85% | Patchy Fog |
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 chance of rain showers between 10pm and 4am, then rain showers likely and patchy fog. Cloudy, with a low around 62. Northeast wind 12 to 21 mph, with gusts as high as 33 mph. Chance of precipitation is 60%. New rainfall amounts between a half and three quarters of an inch possible.
Rain showers and patchy fog before 8am, then showers and thunderstorms between 8am and 9am, then patchy fog and showers and thunderstorms between 9am and 5pm, then patchy fog and showers and thunderstorms. Cloudy, with a high near 70. East northeast wind 21 to 24 mph, with gusts as high as 39 mph. Chance of precipitation is 100%. New rainfall amounts between 2 and 3 inches possible.
Patchy fog and showers and thunderstorms. Cloudy, with a low around 67. East wind 14 to 23 mph, with gusts as high as 37 mph. Chance of precipitation is 100%. New rainfall amounts between 2 and 3 inches possible.
Rain showers likely before 2pm. Partly sunny, with a high near 73. South southwest wind 12 to 15 mph, with gusts as high as 22 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Mostly clear, with a low around 64. West southwest wind around 14 mph, with gusts as high as 21 mph.
Sunny, with a high near 82.
Clear, with a low around 62.
Sunny, with a high near 84.
Clear, with a low around 65.
Sunny, with a high near 83.
Mostly clear, with a low around 64.
Sunny, with a high near 79.
Mostly clear, with a low around 63.
Mostly sunny, with a high near 78.
Lake Hartwell currently reports 79°F with wind velocity near 11 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 Lake Hartwell 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 GSP) high-resolution numerical point-forecast API. LakeRadar uses the official gridpoint for Lake Hartwell 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 Hartwell Water Level & Temperature page.
View Lake Hartwell Water Level & Temperature →