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Official National Weather Service (NWS) point forecast and real-time wind conditions for Big Sandy Reservoir (Wyoming). 24-hour hour-by-hour wind timelines, peak gusts, watercraft recreation safety thresholds, and 7-day marine outlook.
Hydrologic Outlook issued October 8 at 1:47PM MDT by NWS Riverton WY
Today: High 73°F · Low 39°F
Peak gusts: 3 mph · Lake surface chop expected
Humidity: 63% · Barometer: 29.75 inHg
USGS water monitoring available for Big Sandy Reservoir.
Hydrologic Outlook issued October 8 at 1:47PM MDT by NWS Riverton WY
Fair for boating (61/100), from 4 available inputs. Supporting this: Wind 5 mph from the east. Gusts to 7 mph. The forecast mentions thunderstorms, which carries a risk penalty. 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.
Fair for fishing (66/100), from 5 available inputs. Supporting this: Wind 5 mph from the east. Morning hours (08:00 local). Working against it: Air temperature 39°F. The forecast mentions thunderstorms, which carries a risk penalty. 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.
Fair for kayaking (60/100), from 5 available inputs. Supporting this: Wind 5 mph from the east. Gusts to 7 mph. Working against it: Air temperature 39°F. The forecast mentions thunderstorms, which carries a risk penalty. 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: 0% chance of precipitation. Wind 5 mph from the east. Working against it: Air temperature 39°F. The forecast mentions thunderstorms, which carries a risk penalty. 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 | 5 mph | E | ⚡ 7 mph | 0% | Sunny |
| 9 AM | 47°F | 2 mph | E | ⚡ 6 mph | 0% | Sunny |
| 10 AM | 54°F | 3 mph | SW | ⚡ 8 mph | 0% | Sunny |
| 11 AM | 59°F | 6 mph | SW | ⚡ 12 mph | 0% | Sunny |
| 12 PM | 64°F | 12 mph | SW | ⚡ 17 mph | 0% | Sunny |
| 1 PM | 69°F | 15 mph | W | ⚡ 24 mph | 0% | Sunny |
| 2 PM | 71°F | 17 mph | W | ⚡ 28 mph | 0% | Sunny |
| 3 PM | 72°F | 18 mph | W | ⚡ 29 mph | 0% | Sunny |
| 4 PM | 73°F | 18 mph | W | ⚡ 31 mph | 0% | Mostly Sunny |
| 5 PM | 71°F | 18 mph | W | ⚡ 30 mph | 8% | Mostly Sunny |
| 6 PM | 70°F | 17 mph | SW | ⚡ 30 mph | 11% | Partly Cloudy |
| 7 PM | 67°F | 15 mph | SW | ⚡ 28 mph | 4% | Partly Cloudy |
| 8 PM | 60°F | 13 mph | SW | ⚡ 25 mph | 0% | Mostly Clear |
| 9 PM | 57°F | 12 mph | SW | ⚡ 25 mph | 0% | Mostly Clear |
| 10 PM | 54°F | 13 mph | SW | ⚡ 25 mph | 0% | Partly Cloudy |
| 11 PM | 52°F | 13 mph | SW | ⚡ 24 mph | 0% | Partly Cloudy |
| 12 AM | 50°F | 12 mph | SW | ⚡ 23 mph | 2% | Mostly Cloudy |
| 1 AM | 48°F | 9 mph | SW | ⚡ 20 mph | 2% | Mostly Cloudy |
| 2 AM | 47°F | 8 mph | SW | ⚡ 18 mph | 2% | Mostly Cloudy |
| 3 AM | 47°F | 7 mph | SW | ⚡ 16 mph | 3% | Mostly Cloudy |
| 4 AM | 45°F | 7 mph | SW | ⚡ 14 mph | 4% | Mostly Cloudy |
| 5 AM | 44°F | 6 mph | SW | ⚡ 14 mph | 4% | Mostly Cloudy |
| 6 AM | 44°F | 7 mph | SW | ⚡ 14 mph | 4% | Mostly Sunny |
| 7 AM | 42°F | 7 mph | SW | ⚡ 14 mph | 4% | Partly 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, with a high near 73. Southwest wind 2 to 18 mph, with gusts as high as 31 mph.
Partly cloudy. Low around 41, with temperatures rising to around 44 overnight. South southwest wind 6 to 17 mph, with gusts as high as 30 mph.
A slight chance of showers and thunderstorms between noon and 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 68. Southwest wind 7 to 23 mph, with gusts as high as 37 mph. Chance of precipitation is 50%.
Showers and thunderstorms. Mostly cloudy, with a low around 40. South southwest wind 9 to 14 mph, with gusts as high as 26 mph. Chance of precipitation is 80%. New rainfall amounts less than a tenth of an inch possible.
Showers and thunderstorms. Cloudy, with a high near 59. South wind around 12 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New rainfall amounts less than a tenth of an inch possible.
Showers and thunderstorms. Mostly cloudy, with a low around 37. South wind 12 to 22 mph, with gusts as high as 38 mph. Chance of precipitation is 90%.
Showers and thunderstorms. Partly sunny, with a high near 59. South southwest wind 7 to 13 mph, with gusts as high as 25 mph. Chance of precipitation is 80%.
Rain showers likely. Mostly cloudy, with a low around 32. Chance of precipitation is 70%.
A chance of rain showers. Partly sunny, with a high near 54. Chance of precipitation is 50%.
Rain showers likely before 3am, then rain and snow showers likely. Mostly cloudy, with a low around 27.
A chance of rain and snow showers before noon, then a chance of showers and thunderstorms. Partly sunny, with a high near 50.
A chance of rain showers before midnight, then a slight chance of rain and snow showers. Partly cloudy, with a low around 25.
A slight chance of rain and snow showers. Mostly sunny, with a high near 51.
Partly cloudy, with a low around 21.
Big Sandy Reservoir currently reports 38°F with wind velocity near 3 mph from the NW. 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 Big Sandy Reservoir 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 RIW) high-resolution numerical point-forecast API. LakeRadar uses the official gridpoint for Big Sandy Reservoir 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 Big Sandy Reservoir Water Level & Temperature page.
View Big Sandy Reservoir Water Level & Temperature →