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Henrys Lake sits in Idaho and is classified as a reservoir. The water surface spans about 6,500 acres, making it a mid-sized body of water. The deepest point reaches about 22 feet, and the surface sits near 6,473 feet above sea level. Fish documented in the area include Rainbow Trout and Brook Trout. Water data on this page comes from a mapped monitoring station near the lake. Other waters in the region include Henrys Lake, Hebgen Lake, and Island Park Reservoir. Coverage here includes an hourly and 7-day forecast, wind and gust outlook, water readings, fishing conditions, and activity scores for boating, paddling, and swimming. Forecasts for Henrys Lake come from the National Weather Service and refresh several times a day.
Updated
Latest source update is older than expected. Use caution and check the official source.
The last automated check (Oct 9, 3:04 AM MDT) found no active alerts for this lake, but that check is older than LakeRadar's alert freshness window, so the current alert status could not be confirmed.
Confirm before heading out: official alerts for this area or weather.gov/alerts. LakeRadar scores summarize available conditions and are not a substitute for official warnings, local rules, or on-water judgment.
Overall Good (89/100) across 4 activities. Best right now: Boating (99/100).
How the score is calculated →Best excellent fishing window, averaging 90/100 across these hours. Wind 3 mph from the east-southeast. Dawn hours (07:00 local). Derived from the hourly forecast; official alerts are not forecast and are checked separately.
| Metric | 10a | 11a | 12p | 1p | 2p | 3p | 4p | 5p | 6p | 7p | 8p | 9p | 10p | 11p | 12a | 1a | 2a | 3a | 4a | 5a | 6a | 7a | 8a | 9a |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp (°F) | 47° | 46° | 45° | 45° | 44° | 46° | 52° | 57° | 61° | 62° | 64° | 65° | 65° | 66° | 64° | 62° | 61° | 57° | 55° | 53° | 51° | 50° | 50° | 50° |
| Wind (kts) | 2 | 3 | 3 | 3 | 3 | 4 | 5 | 7 | 8 | 11 | 14 | 15 | 16 | 15 | 12 | 12 | 13 | 12 | 10 | 9 | 7 | 6 | 5 | 4 |
| Direction | SE | SE | SE | SE | SE | SE | SE | S | S | SW | SW | SW | SW | SW | SW | SW | SW | W | W | SW | SE | S | SW | S |
| Gusts (kts) | 4 | 4 | 4 | 4 | 4 | 7 | 9 | 13 | 16 | 20 | 23 | 24 | 25 | 24 | 23 | 25 | 26 | 24 | 21 | 16 | 12 | 10 | 8 | 7 |
| Precip % | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 1% | 1% | 6% | 11% | 15% |
| Time | Temp | Wind | Gusts | Precip | Cloud | Condition |
|---|---|---|---|---|---|---|
| Fri, 4 AM MDT | 47°F | 2 mph ESE (113°) | 5 mph | 0% | 28% | Partly Cloudy |
| Fri, 5 AM MDT | 46°F | 3 mph ESE (113°) | 5 mph | 0% | 18% | Mostly Clear |
| Fri, 6 AM MDT | 45°F | 3 mph ESE (113°) | 5 mph | 0% | 19% | Sunny |
| Fri, 7 AM MDT | 45°F | 3 mph ESE (113°) | 5 mph | 0% | 22% | Sunny |
| Fri, 8 AM MDT | 44°F | 3 mph ESE (113°) | 5 mph | 0% | 21% | Sunny |
| Fri, 9 AM MDT | 46°F | 5 mph ESE (113°) | 8 mph | 0% | 6% | Sunny |
| Fri, 10 AM MDT | 52°F | 6 mph SE (135°) | 10 mph | 0% | 2% | Sunny |
| Fri, 11 AM MDT | 57°F | 8 mph SSE (158°) | 15 mph | 0% | 0% | Sunny |
| Fri, 12 PM MDT | 61°F | 9 mph S (180°) | 18 mph | 0% | 6% | Sunny |
| Fri, 1 PM MDT | 62°F | 13 mph SSW (203°) | 23 mph | 0% | 10% | Sunny |
| Fri, 2 PM MDT | 64°F | 16 mph SSW (203°) | 27 mph | 0% | 4% | Sunny |
| Fri, 3 PM MDT | 65°F | 17 mph SSW (203°) | 28 mph | 0% | 9% | Sunny |
| Fri, 4 PM MDT | 65°F | 18 mph SW (225°) | 29 mph | 0% | 4% | Sunny |
| Fri, 5 PM MDT | 66°F | 17 mph SW (225°) | 28 mph | 0% | 5% | Sunny |
| Fri, 6 PM MDT | 64°F | 14 mph SSW (203°) | 27 mph | 0% | 8% | Mostly Clear |
| Fri, 7 PM MDT | 62°F | 14 mph SSW (203°) | 29 mph | 0% | 37% | Partly Cloudy |
| Fri, 8 PM MDT | 61°F | 15 mph SW (225°) | 30 mph | 0% | 38% | Partly Cloudy |
| Fri, 9 PM MDT | 57°F | 14 mph WSW (248°) | 28 mph | 0% | 37% | Partly Cloudy |
| Fri, 10 PM MDT | 55°F | 12 mph W (270°) | 24 mph | 0% | 43% | Partly Cloudy |
| Fri, 11 PM MDT | 53°F | 10 mph SSW (203°) | 18 mph | 1% | 67% | Mostly Cloudy |
| Sat, 12 AM MDT | 51°F | 8 mph SE (135°) | 14 mph | 1% | 56% | Mostly Cloudy |
| Sat, 1 AM MDT | 50°F | 7 mph S (180°) | 12 mph | 6% | 67% | Mostly Cloudy |
| Sat, 2 AM MDT | 50°F | 6 mph SW (225°) | 9 mph | 11% | 76% | Mostly Cloudy |
| Sat, 3 AM MDT | 50°F | 5 mph SSE (158°) | 8 mph | 15% | 80% | Isolated Rain Showers |
| Sat, 4 AM MDT | 50°F | 5 mph SW (225°) | 8 mph | 19% | 67% | Isolated Rain Showers |
Official National Weather Service hourly forecast. Showing 10 of 25 hours. Wind arrows point the way the wind is blowing; the compass point and degrees show where it comes from.
| Period | Overnight October 9, 2026 | Friday October 9, 2026 | Friday Night October 9, 2026 | Saturday October 10, 2026 | Saturday Night October 10, 2026 | Sunday October 11, 2026 | Sunday Night October 11, 2026 | Columbus Day October 12, 2026 | Monday Night October 12, 2026 | Tuesday October 13, 2026 | Tuesday Night October 13, 2026 | Wednesday October 14, 2026 | Wednesday Night October 14, 2026 | Thursday October 15, 2026 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp (°F) | 44° | 67° | 46° | 57° | 42° | 44° | 38° | 48° | 38° | 51° | 35° | 48° | 33° | 47° |
| Wind | ESE 3 mph | S 3 to 18 mph | SSW 5 to 15 mph | S 6 to 15 mph | E 8 mph | ENE 1 to 6 mph | N 2 to 12 mph | NNW 1 to 8 mph | SE 3 mph | S 3 mph | W 3 to 7 mph | W 6 mph | W 8 mph | NNW 6 mph |
| Gusts | 5 mph | 29 mph | 30 mph | 25 mph | 17 mph | 10 mph | 20 mph | 13 mph | 9 mph | 10 mph | 14 mph | 15 mph | 16 mph | 10 mph |
| Precip % | 0% | 0% | 22% | 80% | 99% | 100% | 97% | 90% | 55% | 48% | 46% | 27% | 41% | 18% |
| Forecast |
Good for fishing (86/100), from 5 available inputs. Supporting this: Wind 2 mph from the east-southeast. 0% chance of precipitation. 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 boating (99/100), from 4 available inputs. Supporting this: Wind 2 mph from the east-southeast. Gusts to 5 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.
Fair for sailing (71/100), from 4 available inputs. Supporting this: Gusts are within 3 mph of sustained wind, so the breeze is steady. No active official alerts for this lake. Working against it: Wind 2 mph is light; expect limited sailing. Not available from a verified source for this lake: visibility. Confidence is high (88%).
Excellent for kayaking (96/100), from 5 available inputs. Supporting this: Wind 2 mph from the east-southeast. Gusts to 5 mph. Confidence is high (90%).
Water temperature is not available from a verified source for this lake. No swimming score is shown without it.
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Individual boat ramp GPS coordinates are maintained under the jurisdiction of ID Parks & Wildlife Authority. Public boaters should verify seasonal launch water levels, gate hours, and daily vehicle/vessel fees before traveling.
Nestled in ID, Henrys Lake is an attractive freshwater reservoir celebrated for its open water, scenic shoreline, and productive sport fishery. From spring pre-spawn fishing to peak summer watersports, the lake remains a popular regional destination. Keep watercraft clean, drained, and dry to safeguard this aquatic resource.
Valid freshwater sport fishing license issued by Idaho Department of Fish and Game (IDFG) is required for anglers age 14+. Digital license on mobile is accepted.
Mandatory Clean, Drain & Dry inspection. Out-of-area craft require on-site Aquatic Invasive Species (AIS Quagga/Zebra) inspection or decontamination before launch. USCG life jackets required for all.
Public shoreline and boating access managed by State & Local Authorities. Verify seasonal gate hours, launch fees, and parking rules before travel.
High-speed motorboating, pontoon cruising, wakeboarding, and water skiing across main channels. Target gamefish include Rainbow Trout, Brook Trout. Morning hours typically provide optimal glassy conditions for kayak and stand-up paddleboard (SUP) touring.
Warm water temperatures, peak swimming, active watersports, and open full-service campgrounds. Highest weekly attendance; plan early arrivals on summer weekends.
Spring pre-spawn and fall feeding transitions create prime trophy angling conditions. Cooler air, lower boat traffic, and vibrant seasonal shoreline foliage.
High-altitude mountain winter climate (elevation 6,473 ft MSL). Freezing temperatures, potential snowpack or ice cover, and reduced seasonal amenities. Winter safety caution advised.
No external source rows are cited by the data currently shown on this page.
Updated
Scores are heuristics, not safety guarantees. LakeRadar scores summarize available conditions and are not a substitute for official warnings, local rules, or on-water judgment.
All telemetry for Henrys Lake is synchronized directly from authorized federal and state monitoring networks (USGS, NWS, NOAA, and state environmental authorities). Observations are strictly instrumented readings — unmonitored sensors are transparently disclosed rather than synthetic estimates.
Last source audit: Oct 9, 4:53 AM MDT