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Lake Tapps is a reservoir in Washington. The water surface spans about 2,566 acres, making it a mid-sized body of water. The page brings together an hourly and 7-day forecast, wind and gust outlook, and activity scores for boating, paddling, and swimming. Other waters in the region include American Lake, Lake Sammamish, and Lake Washington. Use the conditions and forecast on this page to decide when to go boating, fishing, or paddling at Lake Tapps.
Updated
Latest source update is older than expected. Use caution and check the official source.
The last automated check (Oct 9, 2:16 AM PDT) 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 (84/100) across 5 activities. Best right now: Boating (95/100).
How the score is calculated →Best excellent fishing window, averaging 92/100 across these hours. Measured water temperature 61°F. Provisional data. Wind 5 mph from the north. 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) | 53° | 53° | 54° | 54° | 52° | 54° | 53° | 55° | 56° | 57° | 58° | 60° | 59° | 59° | 59° | 56° | 54° | 52° | 50° | 49° | 49° | 48° | 47° | 46° |
| Wind (kts) | 6 | 7 | 8 | 8 | 7 | 7 | 8 | 9 | 9 | 8 | 8 | 8 | 7 | 6 | 5 | 5 | 5 | 6 | 6 | 6 | 6 | 6 | 5 | 5 |
| Direction | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | W | SW | S | S | S | S | S | S | S | S | S | S |
| Gusts (kts) | 14 | 17 | 18 | 18 | 17 | 17 | 18 | 20 | 20 | 20 | 19 | 18 | 16 | 15 | 13 | 12 | 12 | 13 | 14 | 15 | 15 | 14 | 14 | 12 |
| Precip % | 0% | 1% | 20% | 24% | 60% | 76% | 56% | 22% | 29% | 26% | 28% | 14% | 13% | 15% | 15% | 12% | 10% | 15% | 10% | 7% | 9% | 9% | 8% | 7% |
| Time | Temp | Wind | Gusts | Precip | Cloud | Condition |
|---|---|---|---|---|---|---|
| Fri, 3 AM PDT | 53°F | 7 mph SSW (203°) | 16 mph | 0% | 82% | Mostly Cloudy |
| Fri, 4 AM PDT | 53°F | 8 mph SSW (203°) | 20 mph | 1% | 85% | Mostly Cloudy |
| Fri, 5 AM PDT | 54°F | 9 mph SSW (203°) | 21 mph | 20% | 91% | Slight Chance Light Rain |
| Fri, 6 AM PDT | 54°F | 9 mph SSW (203°) | 21 mph | 24% | 87% | Slight Chance Light Rain |
| Fri, 7 AM PDT | 52°F | 8 mph SSW (203°) | 20 mph | 60% | 94% | Light Rain Likely |
| Fri, 8 AM PDT | 54°F | 8 mph SW (225°) | 20 mph | 76% | 96% | Light Rain |
| Fri, 9 AM PDT | 53°F | 9 mph SW (225°) | 21 mph | 56% | 97% | Light Rain Likely |
| Fri, 10 AM PDT | 55°F | 10 mph SW (225°) | 23 mph | 22% | 75% | Slight Chance Light Rain |
| Fri, 11 AM PDT | 56°F | 10 mph SW (225°) | 23 mph | 29% | 53% | Chance Light Rain |
| Fri, 12 PM PDT | 57°F | 9 mph SW (225°) | 23 mph | 26% | 51% | Chance Light Rain |
| Fri, 1 PM PDT | 58°F | 9 mph SW (225°) | 22 mph | 28% | 71% | Chance Light Rain |
| Fri, 2 PM PDT | 60°F | 9 mph SW (225°) | 21 mph | 14% | 81% | Mostly Cloudy |
| Fri, 3 PM PDT | 59°F | 8 mph WSW (248°) | 18 mph | 13% | 74% | Mostly Cloudy |
| Fri, 4 PM PDT | 59°F | 7 mph SW (225°) | 17 mph | 15% | 65% | Slight Chance Light Rain |
| Fri, 5 PM PDT | 59°F | 6 mph S (180°) | 15 mph | 15% | 74% | Slight Chance Light Rain |
| Fri, 6 PM PDT | 56°F | 6 mph SSE (158°) | 14 mph | 12% | 70% | Mostly Cloudy |
| Fri, 7 PM PDT | 54°F | 6 mph S (180°) | 14 mph | 10% | 77% | Mostly Cloudy |
| Fri, 8 PM PDT | 52°F | 7 mph S (180°) | 15 mph | 15% | 72% | Slight Chance Light Rain |
| Fri, 9 PM PDT | 50°F | 7 mph S (180°) | 16 mph | 10% | 79% | Mostly Cloudy |
| Fri, 10 PM PDT | 49°F | 7 mph S (180°) | 17 mph | 7% | 74% | Mostly Cloudy |
| Fri, 11 PM PDT | 49°F | 7 mph S (180°) | 17 mph | 9% | 68% | Mostly Cloudy |
| Sat, 12 AM PDT | 48°F | 7 mph S (180°) | 16 mph | 9% | 70% | Mostly Cloudy |
| Sat, 1 AM PDT | 47°F | 6 mph S (180°) | 16 mph | 8% | 64% | Mostly Cloudy |
| Sat, 2 AM PDT | 46°F | 6 mph S (180°) | 14 mph | 7% | 64% | Mostly Cloudy |
| Sat, 3 AM PDT | 46°F | 6 mph S (180°) | 13 mph | 12% | 68% | Mostly 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) | 51° | 61° | 43° | 57° | 39° | 60° | 38° | 62° | 40° | 60° | 47° | 61° | 44° | 63° |
| Wind | SSW 5 to 9 mph | SW 6 to 10 mph | S 2 to 7 mph | S 0 to 5 mph | NE 5 mph | NE 2 to 6 mph | ENE 1 to 5 mph | N 1 mph | E 1 mph | S 1 mph | S 0 to 3 mph | SW 3 mph | SSE 1 mph | NNE 1 mph |
| Gusts | 21 mph | 23 mph | 17 mph | 12 mph | 12 mph | 14 mph | 10 mph | 4 mph | 4 mph | 4 mph | 12 mph | 12 mph | 4 mph | 4 mph |
| Precip % | 20% | 76% | 15% | 12% | 0% | 0% | 0% | 0% | 2% | 28% | 50% | 39% | 12% | 2% |
| Forecast |
LAKE TAPPS DIVERSION AT DIERINGER, WA · Oct 9, 4:45 AM UTC
Good for fishing (85/100), from 6 available inputs. Supporting this: Measured water temperature 61°F. Provisional data. Wind 5 mph from the south-southwest. Not available from a verified source for this lake: pressure trend. Confidence is moderate (73%) because some inputs are unavailable or older than ideal.
Excellent for boating (95/100), from 4 available inputs. Supporting this: Wind 5 mph from the south-southwest. 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.
Good for sailing (82/100), from 4 available inputs. Supporting this: No active official alerts for this lake. Gusts exceed sustained wind by 7 mph, making the breeze puffy. Not available from a verified source for this lake: visibility. Confidence is high (88%).
Good for kayaking (78/100), from 5 available inputs. Supporting this: Wind 5 mph from the south-southwest. Gusts to 12 mph. Combined air and water temperature is 113°F (below the 120°F safety guideline). Thermal protection recommended for paddle craft. Confidence is high (90%).
Surface water measured at 61°F. Air and water contrast evaluate recreational immersion comfort.
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Individual boat ramp GPS coordinates are maintained under the jurisdiction of WA Parks & Wildlife Authority. Public boaters should verify seasonal launch water levels, gate hours, and daily vehicle/vessel fees before traveling.
Offering scenic natural surroundings in WA, Lake Tapps is a vibrant freshwater reservoir that attracts powerboaters, sailors, and bank fishermen alike. The lake's aquatic ecosystem supports rich gamefish populations and scenic wetland areas. Remember to clean and drain all watercraft to prevent the spread of invasive species.
Valid freshwater sport fishing license issued by Washington Department of Fish and Wildlife (WDFW) is required for anglers age 15+. 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 Yellow Perch, Lahontan Cutthroat Trout, Coho Salmon, 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.
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 Tapps 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, 3:18 AM PDT