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Official National Weather Service (NWS) point forecast and real-time wind conditions for Union Valley Reservoir (California). 24-hour hour-by-hour wind timelines, peak gusts, watercraft recreation safety thresholds, and 7-day marine outlook.
Today: High 77°F · Low 50°F
Peak gusts: 16 mph · Lake surface chop expected
Humidity: 23% · Barometer: 29.84 inHg
Live hydrological sensor reading for Union Valley Reservoir.
Good for boating (87/100), from 4 available inputs. Supporting this: Wind 7 mph from the west-southwest. No active official alerts for this lake. 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 (83/100), from 6 available inputs. Supporting this: Wind 7 mph from the west-southwest. 0% chance of precipitation. Not available from a verified source for this lake: pressure trend. Confidence is moderate (72%) because some inputs are unavailable or older than ideal.
Fair for kayaking (62/100), from 5 available inputs. Supporting this: Wind 7 mph from the west-southwest. No active official alerts for this lake. Water temperature is 52°F (combined air+water: 129°F). Cold shock hazard: sudden immersion below 55°F poses serious risk. Confidence is high (90%).
Very Poor / Avoid for swimming (31/100), from 5 available inputs. Supporting this: No active official alerts for this lake. Air temperature 77°F. Working against it: Measured water temperature 52°F from a representative gauge 25.2 mi away. Provisional data. Immersion shock hazard: water below 55°F poses severe cold shock and rapid hypothermia risk. Water temperature is 52°F (below 55°F). Severe cold shock and hypothermia hazard upon immersion. Confidence is moderate (75%) because some inputs are unavailable or older than ideal.
| Time | Air Temp | Wind (mph) | Direction | Peak Gusts | Rain Chance | Sky & Conditions |
|---|---|---|---|---|---|---|
| 4 PM | 77°F | 7 mph | W | ⚡ 18 mph | 0% | Sunny |
| 5 PM | 75°F | 7 mph | W | ⚡ 16 mph | 1% | Sunny |
| 6 PM | 73°F | 5 mph | W | ⚡ 9 mph | 1% | Clear |
| 7 PM | 64°F | 2 mph | SW | ⚡ 6 mph | 1% | Clear |
| 8 PM | 59°F | 3 mph | S | ⚡ 8 mph | 1% | Clear |
| 9 PM | 57°F | 5 mph | S | ⚡ 9 mph | 1% | Mostly Clear |
| 10 PM | 57°F | 3 mph | S | ⚡ 7 mph | 1% | Mostly Clear |
| 11 PM | 57°F | 2 mph | SE | ⚡ 6 mph | 2% | Clear |
| 12 AM | 56°F | 2 mph | SE | ⚡ 6 mph | 2% | Mostly Clear |
| 1 AM | 56°F | 1 mph | S | ⚡ 6 mph | 2% | Mostly Clear |
| 2 AM | 55°F | 1 mph | S | ⚡ 7 mph | 2% | Mostly Clear |
| 3 AM | 55°F | 1 mph | S | ⚡ 7 mph | 2% | Mostly Clear |
| 4 AM | 53°F | 1 mph | S | ⚡ 7 mph | 2% | Mostly Clear |
| 5 AM | 52°F | 1 mph | S | ⚡ 8 mph | 4% | Mostly Clear |
| 6 AM | 51°F | 2 mph | S | ⚡ 9 mph | 4% | Sunny |
| 7 AM | 50°F | 2 mph | S | ⚡ 10 mph | 3% | Sunny |
| 8 AM | 50°F | 5 mph | S | ⚡ 14 mph | 4% | Sunny |
| 9 AM | 52°F | 8 mph | S | ⚡ 20 mph | 4% | Sunny |
| 10 AM | 56°F | 12 mph | SW | ⚡ 24 mph | 3% | Sunny |
| 11 AM | 61°F | 13 mph | SW | ⚡ 25 mph | 3% | Sunny |
| 12 PM | 63°F | 12 mph | SW | ⚡ 27 mph | 3% | Sunny |
| 1 PM | 64°F | 12 mph | SW | ⚡ 27 mph | 3% | Sunny |
| 2 PM | 64°F | 10 mph | SW | ⚡ 27 mph | 3% | Sunny |
| 3 PM | 65°F | 10 mph | SW | ⚡ 25 mph | 3% | 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. High near 79, with temperatures falling to around 75 in the afternoon. West southwest wind around 7 mph, with gusts as high as 18 mph.
Mostly clear. Low around 50, with temperatures rising to around 52 overnight. South wind 1 to 5 mph.
Sunny. High near 66, with temperatures falling to around 61 in the afternoon. South southwest wind 2 to 13 mph, with gusts as high as 26 mph.
Mostly clear, with a low around 42. South southwest wind 0 to 9 mph, with gusts as high as 25 mph.
A chance of rain after 11am. Mostly sunny, with a high near 58. South southwest wind 0 to 7 mph, with gusts as high as 18 mph. Chance of precipitation is 30%.
A chance of rain. Mostly cloudy, with a low around 37. Chance of precipitation is 50%.
Rain likely. Mostly cloudy, with a high near 51.
A chance of rain before 5am. Partly cloudy, with a low around 34.
Sunny, with a high near 59.
Mostly clear, with a low around 37.
Sunny, with a high near 66.
Mostly clear, with a low around 43.
Sunny, with a high near 71.
Clear, with a low around 46.
Union Valley Reservoir currently reports 78°F with wind velocity near 13 mph from the SW. 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 Union Valley 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 STO) high-resolution numerical point-forecast API. LakeRadar uses the official gridpoint for Union Valley 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 Union Valley Reservoir Water Level & Temperature page.
View Union Valley Reservoir Water Level & Temperature →