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Official National Weather Service (NWS) point forecast and real-time wind conditions for Little Grassy Lake (Illinois). 24-hour hour-by-hour wind timelines, peak gusts, watercraft recreation safety thresholds, and 7-day marine outlook.
Today: High 80°F · Low 60°F
Peak gusts: 8 mph · Lake surface chop expected
Humidity: 27% · Barometer: 29.99 inHg
USGS water monitoring available for Little Grassy Lake.
Excellent for boating (98/100), from 4 available inputs. Supporting this: Wind 3 mph from the southeast. 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.
Excellent for fishing (96/100), from 5 available inputs. Supporting this: Wind 3 mph from the southeast. Dusk hours (18:00 local). 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 (98/100), from 5 available inputs. Supporting this: Wind 3 mph from the southeast. Gusts to 6 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. Air temperature 80°F. Not available from a verified source for this lake: water temperature.
| Time | Air Temp | Wind (mph) | Direction | Peak Gusts | Rain Chance | Sky & Conditions |
|---|---|---|---|---|---|---|
| 6 PM | 80°F | 3 mph | SE | ⚡ 6 mph | 0% | Partly Cloudy |
| 7 PM | 73°F | 2 mph | SE | ⚡ 5 mph | 0% | Partly Cloudy |
| 8 PM | 69°F | 2 mph | SE | ⚡ 6 mph | 0% | Mostly Cloudy |
| 9 PM | 67°F | 3 mph | SE | ⚡ 7 mph | 0% | Mostly Cloudy |
| 10 PM | 66°F | 3 mph | SE | ⚡ 8 mph | 0% | Mostly Cloudy |
| 11 PM | 65°F | 3 mph | SE | ⚡ 8 mph | 0% | Mostly Cloudy |
| 12 AM | 66°F | 3 mph | SE | ⚡ 9 mph | 0% | Mostly Cloudy |
| 1 AM | 64°F | 3 mph | SE | ⚡ 8 mph | 1% | Mostly Cloudy |
| 2 AM | 63°F | 3 mph | SE | ⚡ 8 mph | 1% | Mostly Cloudy |
| 3 AM | 62°F | 3 mph | SE | ⚡ 7 mph | 1% | Mostly Cloudy |
| 4 AM | 62°F | 2 mph | SE | ⚡ 6 mph | 1% | Mostly Cloudy |
| 5 AM | 61°F | 2 mph | SE | ⚡ 6 mph | 1% | Mostly Cloudy |
| 6 AM | 61°F | 2 mph | SE | ⚡ 6 mph | 1% | Mostly Cloudy |
| 7 AM | 60°F | 2 mph | SE | ⚡ 6 mph | 2% | Mostly Cloudy |
| 8 AM | 61°F | 3 mph | E | ⚡ 7 mph | 3% | Mostly Cloudy |
| 9 AM | 63°F | 5 mph | E | ⚡ 8 mph | 3% | Cloudy |
| 10 AM | 67°F | 5 mph | SE | ⚡ 8 mph | 4% | Cloudy |
| 11 AM | 69°F | 5 mph | SE | ⚡ 9 mph | 5% | Cloudy |
| 12 PM | 70°F | 5 mph | SE | ⚡ 9 mph | 9% | Cloudy |
| 1 PM | 70°F | 6 mph | SE | ⚡ 10 mph | 20% | Slight Chance Rain Showers |
| 2 PM | 70°F | 6 mph | SE | ⚡ 12 mph | 21% | Slight Chance Rain Showers |
| 3 PM | 71°F | 7 mph | E | ⚡ 14 mph | 41% | Chance Rain Showers |
| 4 PM | 69°F | 8 mph | E | ⚡ 16 mph | 49% | Chance Rain Showers |
| 5 PM | 69°F | 10 mph | NE | ⚡ 20 mph | 51% | 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.
Sunny. High near 88, with temperatures falling to around 85 in the afternoon. South southeast wind around 3 mph.
Mostly cloudy, with a low around 60. Southeast wind around 3 mph.
A chance of rain showers after 1pm. Cloudy. High near 72, with temperatures falling to around 69 in the afternoon. East wind 2 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 50%.
Rain showers likely before 7pm, then showers and thunderstorms between 7pm and 5am. Cloudy, with a low around 58. North northeast wind 5 to 12 mph, with gusts as high as 22 mph. Chance of precipitation is 80%.
Partly sunny, with a high near 78. Northwest wind 3 to 7 mph.
Mostly clear, with a low around 60. Southwest wind 0 to 5 mph.
Sunny, with a high near 87. Southwest wind 5 to 10 mph, with gusts as high as 18 mph.
Clear, with a low around 66. South southwest wind around 9 mph.
Sunny, with a high near 88. Southwest wind around 8 mph.
Mostly clear, with a low around 64. South wind around 7 mph.
A chance of showers and thunderstorms after 7am. Mostly sunny, with a high near 80. Southeast wind around 8 mph.
A chance of showers and thunderstorms. Mostly cloudy, with a low around 63. South southeast wind around 7 mph.
A chance of rain showers before 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 79. South southwest wind 7 to 10 mph.
A chance of showers and thunderstorms before 1am, then a slight chance of showers and thunderstorms. Mostly cloudy, with a low around 58. West southwest wind around 7 mph.
Little Grassy Lake currently reports 80°F with wind velocity near 4 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 Little Grassy 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 PAH) high-resolution numerical point-forecast API. LakeRadar uses the official gridpoint for Little Grassy 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 Little Grassy Lake Water Level & Temperature page.
View Little Grassy Lake Water Level & Temperature →