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Lake Granby is a reservoir located in Colorado. The deepest point reaches about 221 feet, and the surface sits near 8,280 feet above sea level. It covers roughly 7,256 surface acres (about 11 square miles). Research-grade observations nearby include Brook Trout, Mackinaw (Lake Trout), Brown Trout, and Rainbow Trout. Other waters in the region include Shadow Mountain Lake, Grand Lake, and Williams Fork Reservoir. LakeRadar pulls readings from a mapped water gauge, so current water data is shown when the station reports. The page brings together an hourly and 7-day forecast, wind and gust outlook, water readings, fishing conditions, and activity scores for boating, paddling, and swimming. Current weather, wind, and activity conditions for Lake Granby are updated throughout the day.
Updated
No active alerts for this lake as of the last check (Oct 11, 11:50 AM MDT). Alerts are re-checked automatically; see the official source for updates.
Overall Good (88/100) across 4 activities. Best right now: Boating (98/100).
How the score is calculated →Best excellent fishing window, averaging 92/100 across these hours. Wind 6 mph from the southwest. Dawn hours (06:00 local). Derived from the hourly forecast; official alerts are not forecast and are checked separately.
| Metric | 5p | 6p | 7p | 8p | 9p | 10p | 11p | 12a | 1a | 2a | 3a | 4a | 5a | 6a | 7a | 8a | 9a | 10a | 11a | 12p | 1p | 2p | 3p | 4p |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp (°F) | 54° | 58° | 61° | 63° | 64° | 64° | 64° | 64° | 61° | 59° | 55° | 53° | 51° | 49° | 49° | 47° | 45° | 43° | 41° | 41° | 40° | 40° | 42° | 46° |
| Wind (kts) | 2 | 3 | 5 | 5 | 6 | 5 | 4 | 3 | 3 | 4 | 5 | 5 | 4 | 4 | 4 | 5 | 5 | 5 | 5 | 5 | 5 | 4 | 5 | 5 |
| Direction | SW | SW | SW | SW | SW | SW | S | NW | N | SE | S | S | W | W | W | W | W | W | W | SW | SW | W | W | W |
| Gusts (kts) | 3 | 12 | 15 | 18 | 18 | 16 | 13 | 9 | 8 | 9 | 10 | 10 | 8 | 8 | 8 | 8 | 8 | 7 | 7 | 8 | 9 | 9 | 13 | 15 |
| Precip % | 5% | 15% | 15% | 15% | 19% | 19% | 19% | 25% | 25% | 25% | 18% | 18% | 18% | 13% | 13% | 13% | 18% | 18% | 18% | 0% | 0% | 0% | 0% | 0% |
| Time | Temp | Wind | Gusts | Precip | Cloud | Condition |
|---|---|---|---|---|---|---|
| Sun, 11 AM MDT | 54°F | 2 mph SW (225°) | 4 mph | 5% | 71% | Mostly Cloudy |
| Sun, 12 PM MDT | 58°F | 3 mph SW (225°) | 14 mph | 15% | 69% | Slight Chance Rain Showers |
| Sun, 1 PM MDT | 61°F | 6 mph SW (225°) | 17 mph | 15% | 67% | Slight Chance Rain Showers |
| Sun, 2 PM MDT | 63°F | 6 mph SW (225°) | 21 mph | 15% | 66% | Slight Chance Rain Showers |
| Sun, 3 PM MDT | 64°F | 7 mph SW (225°) | 21 mph | 19% | 61% | Slight Chance Rain Showers |
| Sun, 4 PM MDT | 64°F | 6 mph SW (225°) | 18 mph | 19% | 62% | Slight Chance Rain Showers |
| Sun, 5 PM MDT | 64°F | 5 mph S (180°) | 15 mph | 19% | 57% | Slight Chance Rain Showers |
| Sun, 6 PM MDT | 64°F | 3 mph NW (315°) | 10 mph | 25% | 61% | Chance Rain Showers |
| Sun, 7 PM MDT | 61°F | 3 mph N (0°) | 9 mph | 25% | 70% | Chance Rain Showers |
| Sun, 8 PM MDT | 59°F | 5 mph ESE (113°) | 10 mph | 25% | 67% | Chance Rain Showers |
| Sun, 9 PM MDT | 55°F | 6 mph SSE (158°) | 12 mph | 18% | 61% | Slight Chance Rain Showers |
| Sun, 10 PM MDT | 53°F | 6 mph S (180°) | 12 mph | 18% | 48% | Slight Chance Rain Showers |
| Sun, 11 PM MDT | 51°F | 5 mph WSW (248°) | 9 mph | 18% | 43% | Slight Chance Rain Showers |
| Mon, 12 AM MDT | 49°F | 5 mph W (270°) | 9 mph | 13% | 37% | Partly Cloudy |
| Mon, 1 AM MDT | 49°F | 5 mph WSW (248°) | 9 mph | 13% | 32% | Partly Cloudy |
| Mon, 2 AM MDT | 47°F | 6 mph W (270°) | 9 mph | 13% | 20% | Mostly Clear |
| Mon, 3 AM MDT | 45°F | 6 mph W (270°) | 9 mph | 18% | 33% | Slight Chance Rain Showers |
| Mon, 4 AM MDT | 43°F | 6 mph W (270°) | 8 mph | 18% | 33% | Slight Chance Rain Showers |
| Mon, 5 AM MDT | 41°F | 6 mph W (270°) | 8 mph | 18% | 33% | Slight Chance Rain Showers |
| Mon, 6 AM MDT | 41°F | 6 mph SW (225°) | 9 mph | 0% | 36% | Mostly Sunny |
| Mon, 7 AM MDT | 40°F | 6 mph SSW (203°) | 10 mph | 0% | 33% | Mostly Sunny |
| Mon, 8 AM MDT | 40°F | 5 mph WSW (248°) | 10 mph | 0% | 29% | Mostly Sunny |
| Mon, 9 AM MDT | 42°F | 6 mph WSW (248°) | 15 mph | 0% | 22% | Sunny |
| Mon, 10 AM MDT | 46°F | 6 mph WSW (248°) | 17 mph | 0% | 27% | Mostly Sunny |
| Mon, 11 AM MDT | 50°F | 9 mph WSW (248°) | 22 mph | 0% | 41% | Mostly Sunny |
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 | Today October 11, 2026 | Tonight 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 | Thursday Night October 15, 2026 | Friday October 16, 2026 | Friday Night October 16, 2026 | Saturday October 17, 2026 | Saturday Night October 17, 2026 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp (°F) | 65° | 40° | 59° | 37° | 58° | 35° | 47° | 31° | 47° | 28° | 51° | 29° | 56° | 32° |
| Wind | SSW 1 to 7 mph | WSW 6 mph | SW 5 to 13 mph | ENE 5 mph | SSW 1 to 7 mph | ESE 6 mph | SE 5 to 10 mph | W 6 to 9 mph | WNW 2 to 7 mph | NNE 2 to 7 mph | E 0 to 5 mph | SE 3 mph | W 0 to 7 mph | WSW 5 mph |
| Gusts | 21 mph | 12 mph | 28 mph | 14 mph | 22 mph | 13 mph | 24 mph | 16 mph | 17 mph | 14 mph | 14 mph | 9 mph | 17 mph | 9 mph |
| Precip % | 19% | 25% | 0% | 22% | 39% | 60% | 77% | 72% | 39% | 27% | 11% | 9% | 4% | 9% |
| Forecast |
No active USGS or USACE telemetry gauge is currently mapped to Lake Granby. Not available from a verified source for this lake.
Good for fishing (83/100), from 5 available inputs. Supporting this: Wind 2 mph from the southwest. 5% 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 (98/100), from 4 available inputs. Supporting this: Wind 2 mph from the southwest. Gusts to 4 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 2 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 (97/100), from 5 available inputs. Supporting this: Wind 2 mph from the southwest. Gusts to 4 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 CO Parks & Wildlife Authority. Public boaters should verify seasonal launch water levels, gate hours, and daily vehicle/vessel fees before traveling.
Lake Granby serves as a key recreational and ecological freshwater reservoir in CO, overseen by state and local natural resource agencies. The waterbody supports active boating, angling, and shoreline access throughout the open season. Visitors are encouraged to verify current launch conditions, water levels, and local regulations before heading out onto the water.
Valid freshwater sport fishing license issued by Colorado Parks and Wildlife (CPW) is required for anglers age 16+. 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 Brook Trout, Mackinaw (Lake Trout), Brown Trout, Rainbow 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 8,280 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 Lake Granby 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 11, 11:50 AM MDT