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Lake Sonoma is a reservoir in California. At around 2,700 acres (about 4 square miles), it is a mid-sized waterbody. Other waters in the region include Clear Lake and Lake Berryessa. For this location, LakeRadar tracks an hourly and 7-day forecast, wind and gust outlook, and activity scores for boating, paddling, and swimming. Use the conditions and forecast on this page to decide when to go boating, fishing, or paddling at Lake Sonoma.
Updated
Alerts are published by official agencies and shown verbatim. View the official alert source.
Coastal Flood Advisory issued October 8 at 9:45PM PDT until October 14 at 4:00PM PDT by NWS San Francisco CA
Overall Good (76/100) across 5 activities. Best right now: Kayaking (90/100).
How the score is calculated →Best good fishing window, averaging 89/100 across these hours. Measured water temperature 57°F from a representative gauge 6.9 mi away. Provisional data. Wind 3 mph from the northwest. Derived from the hourly forecast; official alerts are not forecast and are checked separately.
| Metric | 9a | 10a | 11a | 12p | 1p | 2p | 3p | 4p | 5p | 6p | 7p | 8p | 9p | 10p | 11p | 12a | 1a | 2a | 3a | 4a | 5a | 6a | 7a | 8a |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp (°F) | 72° | 69° | 68° | 66° | 64° | 65° | 66° | 69° | 75° | 79° | 85° | 88° | 90° | 91° | 90° | 88° | 85° | 76° | 71° | 67° | 64° | 62° | 60° | 59° |
| Wind (kts) | 3 | 3 | 3 | 3 | 3 | 2 | 2 | 2 | 2 | 2 | 2 | 3 | 4 | 4 | 3 | 3 | 2 | 2 | 2 | 2 | 2 | 2 | 3 | 4 |
| Direction | NW | NW | NW | NW | NW | NW | S | SE | SE | SE | SE | SE | SE | S | SE | SE | SE | SE | SE | E | NW | NW | NW | NW |
| Gusts (kts) | 6 | 5 | 5 | 5 | 5 | 5 | 5 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 10 | 10 | 7 | 6 | 4 | 4 | 4 | 5 | 6 | 9 |
| Precip % | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 1% | 1% | 1% | 1% | 1% | 1% | 1% | 0% | 0% | 0% | 0% | 0% | 0% | 0% |
| Time | Temp | Wind | Gusts | Precip | Cloud | Condition |
|---|---|---|---|---|---|---|
| Fri, 2 AM PDT | 72°F | 3 mph NW (315°) | 7 mph | 0% | 8% | Mostly Clear |
| Fri, 3 AM PDT | 69°F | 3 mph NW (315°) | 6 mph | 0% | 7% | Mostly Clear |
| Fri, 4 AM PDT | 68°F | 3 mph NW (315°) | 6 mph | 0% | 9% | Mostly Clear |
| Fri, 5 AM PDT | 66°F | 3 mph NW (315°) | 6 mph | 0% | 11% | Mostly Clear |
| Fri, 6 AM PDT | 64°F | 3 mph NW (315°) | 6 mph | 0% | 21% | Sunny |
| Fri, 7 AM PDT | 65°F | 2 mph NW (315°) | 6 mph | 0% | 18% | Sunny |
| Fri, 8 AM PDT | 66°F | 2 mph S (180°) | 6 mph | 0% | 8% | Sunny |
| Fri, 9 AM PDT | 69°F | 2 mph ESE (113°) | 5 mph | 0% | 14% | Sunny |
| Fri, 10 AM PDT | 75°F | 2 mph ESE (113°) | 6 mph | 0% | 9% | Sunny |
| Fri, 11 AM PDT | 79°F | 2 mph SE (135°) | 7 mph | 0% | 6% | Sunny |
| Fri, 12 PM PDT | 85°F | 2 mph SE (135°) | 8 mph | 1% | 8% | Sunny |
| Fri, 1 PM PDT | 88°F | 3 mph SE (135°) | 9 mph | 1% | 1% | Sunny |
| Fri, 2 PM PDT | 90°F | 5 mph SE (135°) | 10 mph | 1% | 0% | Sunny |
| Fri, 3 PM PDT | 91°F | 5 mph SSE (158°) | 12 mph | 1% | 1% | Sunny |
| Fri, 4 PM PDT | 90°F | 3 mph SE (135°) | 12 mph | 1% | 2% | Sunny |
| Fri, 5 PM PDT | 88°F | 3 mph SE (135°) | 12 mph | 1% | 1% | Sunny |
| Fri, 6 PM PDT | 85°F | 2 mph ESE (113°) | 8 mph | 1% | 1% | Clear |
| Fri, 7 PM PDT | 76°F | 2 mph SE (135°) | 7 mph | 0% | 3% | Clear |
| Fri, 8 PM PDT | 71°F | 2 mph SE (135°) | 5 mph | 0% | 7% | Mostly Clear |
| Fri, 9 PM PDT | 67°F | 2 mph E (90°) | 5 mph | 0% | 20% | Mostly Clear |
| Fri, 10 PM PDT | 64°F | 2 mph NW (315°) | 5 mph | 0% | 27% | Partly Cloudy |
| Fri, 11 PM PDT | 62°F | 2 mph WNW (293°) | 6 mph | 0% | 28% | Partly Cloudy |
| Sat, 12 AM PDT | 60°F | 3 mph NW (315°) | 7 mph | 0% | 37% | Partly Cloudy |
| Sat, 1 AM PDT | 59°F | 5 mph NW (315°) | 10 mph | 0% | 36% | Partly Cloudy |
| Sat, 2 AM PDT | 58°F | 6 mph WNW (293°) | 13 mph | 0% | 38% | Partly Cloudy |
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) | 64° | 92° | 50° | 72° | 46° | 69° | 46° | 70° | 46° | 73° | 48° | 78° | 52° | 86° |
| Wind | NW 3 mph | SE 5 mph | NNW 2 to 8 mph | WNW 5 to 8 mph | NW 6 to 9 mph | NW 2 to 6 mph | N 3 mph | E 5 mph | NNW 5 mph | WSW 1 to 5 mph | NW 5 mph | NW 0 to 3 mph | NW 5 mph | NW 0 to 3 mph |
| Gusts | 7 mph | 12 mph | 17 mph | 18 mph | 22 mph | 13 mph | 9 mph | 12 mph | 12 mph | 12 mph | 12 mph | 12 mph | 12 mph | 6 mph |
| Precip % | 0% | 1% | 1% | 1% | 3% | 12% | 12% | 12% | 1% | 0% | 0% | 0% | 0% | 0% |
| Forecast |
DRY C BLW LAMBERT BR NR GEYSERVILLE CA · Oct 9, 8:00 AM UTC
Good for fishing (84/100), from 6 available inputs. Supporting this: Wind 3 mph from the northwest. Measured water temperature 57°F from a representative gauge 6.9 mi away. Provisional data. Not available from a verified source for this lake: pressure trend. Confidence is moderate (76%) because some inputs are unavailable or older than ideal.
Good for boating (88/100), from 4 available inputs. Supporting this: Wind 3 mph from the northwest. Gusts to 7 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 (65/100), from 4 available inputs. Supporting this: Gusts are within 4 mph of sustained wind, so the breeze is steady. 0% chance of precipitation. Not available from a verified source for this lake: visibility. Confidence is high (88%).
Excellent for kayaking (90/100), from 5 available inputs. Supporting this: Wind 3 mph from the northwest. Gusts to 7 mph. Confidence is high (90%).
Surface water measured at 57°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.
As a core recreational asset in CA, Lake Sonoma draws water enthusiasts for angling, paddling, and watersports throughout the season. Its diverse shoreline features public parks, boat launches, and scenic day-use areas overseen by state and local natural resource agencies. Please respect designated no-wake zones and wildlife preservation areas.
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 Rainbow Trout, Chinook Salmon, Largemouth Bass, Smallmouth Bass. 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 Lake Sonoma 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, 2:33 AM PDT