Loading page content…
Loading page content…
Loading lake conditions…
Official National Weather Service (NWS) point forecast and real-time wind conditions for Arrowrock Reservoir (Idaho). 24-hour hour-by-hour wind timelines, peak gusts, watercraft recreation safety thresholds, and 7-day marine outlook.
Today: High 81°F · Low 47°F
Peak gusts: 8 mph · Lake surface chop expected
Humidity: 24% · Barometer: 29.81 inHg
USGS water monitoring available for Arrowrock Reservoir.
Excellent for boating (92/100), from 4 available inputs. Supporting this: Wind 8 mph from the east. 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.
Excellent for fishing (91/100), from 5 available inputs. Supporting this: Wind 8 mph from the east. Dawn hours (07:00 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 (90/100), from 5 available inputs. Supporting this: Wind 8 mph from the east. Gusts to 12 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. 1% chance of precipitation. Working against it: Air temperature 49°F. Not available from a verified source for this lake: water temperature.
| Time | Air Temp | Wind (mph) | Direction | Peak Gusts | Rain Chance | Sky & Conditions |
|---|---|---|---|---|---|---|
| 7 AM | 49°F | 8 mph | E | ⚡ 12 mph | 1% | Sunny |
| 8 AM | 47°F | 7 mph | E | ⚡ 12 mph | 1% | Sunny |
| 9 AM | 50°F | 7 mph | E | ⚡ 12 mph | 1% | Sunny |
| 10 AM | 58°F | 8 mph | E | ⚡ 13 mph | 0% | Sunny |
| 11 AM | 66°F | 7 mph | SE | ⚡ 13 mph | 2% | Sunny |
| 12 PM | 73°F | 8 mph | W | ⚡ 15 mph | 0% | Sunny |
| 1 PM | 78°F | 10 mph | W | ⚡ 17 mph | 0% | Sunny |
| 2 PM | 79°F | 9 mph | W | ⚡ 16 mph | 0% | Sunny |
| 3 PM | 80°F | 9 mph | W | ⚡ 16 mph | 0% | Sunny |
| 4 PM | 81°F | 9 mph | NW | ⚡ 16 mph | 0% | Sunny |
| 5 PM | 80°F | 10 mph | NW | ⚡ 17 mph | 0% | Sunny |
| 6 PM | 78°F | 8 mph | NW | ⚡ 15 mph | 6% | Partly Cloudy |
| 7 PM | 74°F | 5 mph | NW | ⚡ 13 mph | 12% | Partly Cloudy |
| 8 PM | 69°F | 6 mph | W | ⚡ 12 mph | 28% | Chance Rain Showers |
| 9 PM | 67°F | 5 mph | W | ⚡ 10 mph | 36% | Chance Rain Showers |
| 10 PM | 66°F | 5 mph | W | ⚡ 9 mph | 28% | Chance Rain Showers |
| 11 PM | 64°F | 3 mph | SE | ⚡ 9 mph | 21% | Slight Chance Rain Showers |
| 12 AM | 62°F | 7 mph | W | ⚡ 16 mph | 2% | Mostly Cloudy |
| 1 AM | 59°F | 6 mph | W | ⚡ 10 mph | 4% | Mostly Cloudy |
| 2 AM | 57°F | 5 mph | W | ⚡ 8 mph | 7% | Mostly Cloudy |
| 3 AM | 54°F | 7 mph | W | ⚡ 10 mph | 2% | Partly Cloudy |
| 4 AM | 52°F | 7 mph | W | ⚡ 10 mph | 2% | Partly Cloudy |
| 5 AM | 50°F | 6 mph | W | ⚡ 12 mph | 3% | Mostly Cloudy |
| 6 AM | 48°F | 7 mph | W | ⚡ 10 mph | 6% | Mostly Cloudy |
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 81. West wind 7 to 10 mph.
A chance of rain showers between 8pm and midnight. Mostly cloudy. Low around 45, with temperatures rising to around 50 overnight. West wind 3 to 8 mph. Chance of precipitation is 40%.
Mostly cloudy, with a high near 62. West wind 7 to 12 mph.
Rain showers likely. Mostly cloudy, with a low around 40. Northwest wind 2 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 60%.
Rain showers likely. Mostly cloudy, with a high near 55. West northwest wind 1 to 5 mph. Chance of precipitation is 60%.
Rain showers likely. Mostly cloudy, with a low around 40. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.
Rain showers likely before 7am, then rain showers likely and patchy fog. Mostly cloudy, with a high near 54. Chance of precipitation is 70%.
A chance of rain showers before 5am, then a chance of rain showers and patchy fog. Mostly cloudy, with a low around 37. Chance of precipitation is 40%.
Areas of fog and a chance of rain showers. Mostly sunny, with a high near 56. Chance of precipitation is 30%.
Partly cloudy, with a low around 36.
Mostly sunny, with a high near 58.
Mostly clear, with a low around 36.
Sunny, with a high near 61.
Mostly clear, with a low around 36.
Arrowrock Reservoir currently reports 59°F with wind velocity near 8 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 Arrowrock 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 BOI) high-resolution numerical point-forecast API. LakeRadar uses the official gridpoint for Arrowrock 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 Arrowrock Reservoir Water Level & Temperature page.
View Arrowrock Reservoir Water Level & Temperature →