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Trinity Lake sits in California and is classified as a reservoir. It covers roughly 16,535 surface acres (about 26 square miles). Nearby alternatives include Shasta Lake. The page brings together an hourly and 7-day forecast, wind and gust outlook, and activity scores for boating, paddling, and swimming. Current weather, wind, and activity conditions for Trinity Lake are updated throughout the day.
Updated
No active alerts for this lake as of the last check (Oct 9, 7:28 AM PDT). Alerts are re-checked automatically; see the official source for updates.
Best good fishing window, averaging 83/100 across these hours. Wind 6 mph from the northeast. Dusk hours (18:00 local). Derived from the hourly forecast; official alerts are not forecast and are checked separately.
| Metric | 2p | 3p | 4p | 5p | 6p | 7p | 8p | 9p | 10p | 11p | 12a | 1a | 2a | 3a | 4a | 5a | 6a | 7a | 8a | 9a | 10a | 11a | 12p | 1p |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp (°F) | 60° | 61° | 65° | 71° | 76° | 82° | 84° | 85° | 86° | 84° | 82° | 80° | 73° | 69° | 66° | 63° | 60° | 58° | 57° | 55° | 54° | 52° | 51° | 49° |
| Wind (kts) | 2 | 3 | 3 | 3 | 9 | 9 | 9 | 12 | 12 | 12 | 9 | 9 | 9 | 8 | 8 | 8 | 8 | 8 | 8 | 5 | 5 | 5 | 4 | 4 |
| Direction | SW | SW | SW | SW | W | W | W | W | W | W | W | W | W | S | S | S | S | S | S | S | S | S | SW | SW |
| Gusts (kts) | 2 | 4 | 4 | 4 | 14 | 14 | 14 | 19 | 19 | 19 | 15 | 15 | 15 | 12 | 12 | 12 | 12 | 12 | 12 | 8 | 8 | 8 | 6 | 6 |
| Precip % | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 1% | 1% | 1% | 1% | 1% | 1% | 1% | 1% |
| Time | Temp | Wind | Gusts | Precip | Cloud | Condition |
|---|---|---|---|---|---|---|
| Fri, 7 AM PDT | 60°F | 2 mph SSW (203°) | 2 mph | 0% | 5% | Sunny |
| Fri, 8 AM PDT | 61°F | 3 mph SW (225°) | 5 mph | 0% | 18% | Sunny |
| Fri, 9 AM PDT | 65°F | 3 mph SW (225°) | 5 mph | 0% | 18% | Sunny |
| Fri, 10 AM PDT | 71°F | 3 mph SW (225°) | 5 mph | 0% | 18% | Sunny |
| Fri, 11 AM PDT | 76°F | 10 mph WSW (248°) | 16 mph | 0% | 3% | Sunny |
| Fri, 12 PM PDT | 82°F | 10 mph WSW (248°) | 16 mph | 0% | 3% | Sunny |
| Fri, 1 PM PDT | 84°F | 10 mph WSW (248°) | 16 mph | 0% | 3% | Sunny |
| Fri, 2 PM PDT | 85°F | 14 mph WSW (248°) | 22 mph | 0% | 1% | Sunny |
| Fri, 3 PM PDT | 86°F | 14 mph WSW (248°) | 22 mph | 0% | 1% | Sunny |
| Fri, 4 PM PDT | 84°F | 14 mph WSW (248°) | 22 mph | 0% | 1% | Sunny |
| Fri, 5 PM PDT | 82°F | 10 mph WSW (248°) | 17 mph | 0% | 3% | Sunny |
| Fri, 6 PM PDT | 80°F | 10 mph WSW (248°) | 17 mph | 0% | 3% | Clear |
| Fri, 7 PM PDT | 73°F | 10 mph WSW (248°) | 17 mph | 0% | 3% | Clear |
| Fri, 8 PM PDT | 69°F | 9 mph S (180°) | 14 mph | 0% | 2% | Clear |
| Fri, 9 PM PDT | 66°F | 9 mph S (180°) | 14 mph | 0% | 2% | Clear |
| Fri, 10 PM PDT | 63°F | 9 mph S (180°) | 14 mph | 0% | 2% | Clear |
| Fri, 11 PM PDT | 60°F | 9 mph S (180°) | 14 mph | 1% | 2% | Clear |
| Sat, 12 AM PDT | 58°F | 9 mph S (180°) | 14 mph | 1% | 2% | Clear |
| Sat, 1 AM PDT | 57°F | 9 mph S (180°) | 14 mph | 1% | 2% | Clear |
| Sat, 2 AM PDT | 55°F | 6 mph S (180°) | 9 mph | 1% | 4% | Clear |
| Sat, 3 AM PDT | 54°F | 6 mph S (180°) | 9 mph | 1% | 4% | Clear |
| Sat, 4 AM PDT | 52°F | 6 mph S (180°) | 9 mph | 1% | 4% | Clear |
| Sat, 5 AM PDT | 51°F | 5 mph SSW (203°) | 7 mph | 1% | 8% | Mostly Clear |
| Sat, 6 AM PDT | 49°F | 5 mph SSW (203°) | 7 mph | 1% | 8% | Sunny |
| Sat, 7 AM PDT | 48°F | 5 mph SSW (203°) | 7 mph | 1% | 8% | 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 | Overnight October 9, 2026 | Friday October 9, 2026 | Today October 9, 2026 | Tonight 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp (°F) | 60° | 86° | 86° | 48° | 67° | 43° | 60° | 41° | 62° | 41° | 68° | 44° | 72° | 48° |
| Wind | SW 2 mph | SW 2 to 10 mph | SW 2 to 14 mph | SSW 5 to 10 mph | S 1 to 6 mph | NNE 5 to 10 mph | NNE 5 to 9 mph | NNE 2 to 7 mph | ESE 3 mph | NNE 1 mph | W 2 mph | 0 mph | NNW 1 mph | NNW 0 to 3 mph |
| Gusts | 4 mph | 16 mph | 22 mph | 17 mph | 9 mph | 15 mph | 14 mph | 10 mph | 8 mph | 7 mph | 8 mph | 7 mph | 6 mph | 8 mph |
| Precip % | 1% | 1% | 0% | 1% | 27% | 49% | 5% | 4% | 5% | 5% | 1% | 1% | 1% | 0% |
| Forecast |
No active USGS or USACE telemetry gauge is currently mapped to Trinity Lake. Not available from a verified source for this lake.
TRINITY R A LEWISTON CA · Oct 9, 2:15 PM UTC
Good for fishing (79/100), from 6 available inputs. Supporting this: Wind 2 mph from the south-southwest. 0% chance of precipitation. Not available from a verified source for this lake: pressure trend. Confidence is moderate (82%) 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 south-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%).
Fair for kayaking (74/100), from 5 available inputs. Supporting this: Wind 2 mph from the south-southwest. Gusts to 4 mph. Water temperature is 51°F (combined air+water: 119°F). Cold shock hazard: sudden immersion below 55°F poses serious risk. Confidence is high (90%).
Surface water measured at 51°F. Cold shock reflex presents an immediate drowning risk.
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Individual boat ramp GPS coordinates are maintained under the jurisdiction of CA Parks & Wildlife Authority. Public boaters should verify seasonal launch water levels, gate hours, and daily vehicle/vessel fees before traveling.
Trinity Lake offers an inviting freshwater retreat in CA, overseen by state and local natural resource agencies. Its waters provide ample room for watersports, pontoon cruising, and quiet morning paddle trips along sheltered bays. Staying updated on real-time streamflow and meteorological conditions ensures a smooth trip on the water.
Valid freshwater sport fishing license issued by California Department of Fish and Wildlife (CDFW) 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, Rainbow Trout, Spotted Bass, Chinook Salmon. 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.
Mild year-round outdoor climate. Uncrowded waters, active winter bass and crappie fishing, and open year-round boat launch access.
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 Trinity 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, 7:32 AM PDT