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Blue Marsh Lake is one of the reservoirs LakeRadar tracks in Pennsylvania. Its recorded surface area is approximately 1,147 acres. Fish documented in the area include Brown Trout, Brook Trout, Largemouth Bass, and Green Sunfish. Sitting at around 290 feet of elevation, it drops to a maximum depth near 53 feet. 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. If you are planning a trip, Marsh Creek Lake, Memorial Lake, and Mauch Chunk Lake are also nearby. Water data on this page comes from a mapped monitoring station near the lake. This page combines the live forecast, wind, and conditions for Blue Marsh Lake so you can plan a visit.
Updated
No active alerts for this lake as of the last check (Oct 9, 5:18 PM EDT). Alerts are re-checked automatically; see the official source for updates.
Best excellent fishing window, averaging 94/100 across these hours. Measured water temperature 65°F from a representative gauge 0.8 mi away. Provisional data. Wind 5 mph from the east. Derived from the hourly forecast; official alerts are not forecast and are checked separately.
| Metric | 9p | 10p | 11p | 12a | 1a | 2a | 3a | 4a | 5a | 6a | 7a | 8a | 9a | 10a | 11a | 12p | 1p | 2p | 3p | 4p | 5p | 6p | 7p | 8p |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp (°F) | 69° | 67° | 64° | 57° | 55° | 52° | 51° | 50° | 48° | 48° | 46° | 46° | 45° | 45° | 44° | 46° | 51° | 58° | 63° | 67° | 68° | 69° | 70° | 69° |
| Wind (kts) | 4 | 4 | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| Direction | NW | W | NW | — | — | — | — | — | — | — | — | — | — | — | — | — | — | NE | E | E | E | E | E | E |
| Gusts (kts) | 14 | 9 | 7 | 4 | 3 | 3 | 3 | 2 | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 4 | 4 | 5 | 7 | 6 | 6 | 7 | 7 | 7 |
| Precip % | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 1% | 1% | 1% |
| Time | Temp | Wind | Gusts | Precip | Cloud | Condition |
|---|---|---|---|---|---|---|
| Fri, 5 PM EDT | 69°F | 5 mph NW (315°) | 16 mph | 0% | 53% | Partly Sunny |
| Fri, 6 PM EDT | 67°F | 5 mph W (270°) | 10 mph | 0% | 59% | Mostly Cloudy |
| Fri, 7 PM EDT | 64°F | 5 mph NW (315°) | 8 mph | 0% | 74% | Mostly Cloudy |
| Fri, 8 PM EDT | 57°F | Calm | 5 mph | 0% | 78% | Mostly Cloudy |
| Fri, 9 PM EDT | 55°F | Calm | 4 mph | 0% | 78% | Mostly Cloudy |
| Fri, 10 PM EDT | 52°F | Calm | 4 mph | 0% | 72% | Mostly Cloudy |
| Fri, 11 PM EDT | 51°F | Calm | 4 mph | 0% | 74% | Mostly Cloudy |
| Sat, 12 AM EDT | 50°F | Calm | 2 mph | 0% | 68% | Mostly Cloudy |
| Sat, 1 AM EDT | 48°F | Calm | 2 mph | 0% | 43% | Partly Cloudy |
| Sat, 2 AM EDT | 48°F | Calm | 2 mph | 0% | 42% | Partly Cloudy |
| Sat, 3 AM EDT | 46°F | Calm | 2 mph | 0% | 52% | Mostly Cloudy |
| Sat, 4 AM EDT | 46°F | Calm | 2 mph | 0% | 41% | Partly Cloudy |
| Sat, 5 AM EDT | 45°F | Calm | 4 mph | 0% | 50% | Partly Cloudy |
| Sat, 6 AM EDT | 45°F | Calm | 4 mph | 0% | 38% | Mostly Sunny |
| Sat, 7 AM EDT | 44°F | Calm | 4 mph | 0% | 52% | Partly Sunny |
| Sat, 8 AM EDT | 46°F | Calm | 5 mph | 0% | 50% | Mostly Sunny |
| Sat, 9 AM EDT | 51°F | Calm | 5 mph | 0% | 47% | Mostly Sunny |
| Sat, 10 AM EDT | 58°F | 5 mph NE (45°) | 6 mph | 0% | 61% | Partly Sunny |
| Sat, 11 AM EDT | 63°F | 5 mph E (90°) | 8 mph | 0% | 59% | Partly Sunny |
| Sat, 12 PM EDT | 67°F | 5 mph E (90°) | 7 mph | 0% | 53% | Partly Sunny |
| Sat, 1 PM EDT | 68°F | 5 mph E (90°) | 7 mph | 0% | 58% | Partly Sunny |
| Sat, 2 PM EDT | 69°F | 5 mph E (90°) | 8 mph | 1% | 60% | Partly Sunny |
| Sat, 3 PM EDT | 70°F | 5 mph E (90°) | 8 mph | 1% | 60% | Partly Sunny |
| Sat, 4 PM EDT | 69°F | 5 mph E (90°) | 8 mph | 1% | 53% | Partly Sunny |
| Sat, 5 PM EDT | 69°F | 5 mph SE (135°) | 8 mph | 1% | 61% | Partly 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 | This Afternoon 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 | Thursday October 15, 2026 | Thursday Night October 15, 2026 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp (°F) | 71° | 44° | 70° | 53° | 63° | 61° | 73° | 57° | 75° | 54° | 66° | 47° | 63° | 49° |
| Wind | NW 5 mph | NW 0 to 5 mph | NE 0 to 5 mph | E 5 mph | E 5 to 15 mph | NE 5 to 15 mph | NW 5 to 10 mph | NW 0 to 10 mph | SW 0 to 10 mph | W 10 to 15 mph | NW 10 to 15 mph | N 5 to 10 mph | NE 5 mph | SE 5 mph |
| Gusts | 16 mph | 10 mph | 8 mph | 13 mph | 30 mph | 28 mph | 20 mph | 13 mph | 18 mph | 21 mph | 21 mph | 16 mph | 12 mph | 10 mph |
| Precip % | 0% | 0% | 1% | 1% | 100% | 100% | 54% | 2% | 35% | 35% | 8% | 15% | 24% | 35% |
| Forecast |
Tulpehocken Cr at Blue Marsh Damsite near Reading · Oct 9, 1:15 AM UTC
Good for fishing (82/100), from 6 available inputs. Supporting this: Measured water temperature 65°F from a representative gauge 0.8 mi away. Provisional data. 0% chance of precipitation. Not available from a verified source for this lake: pressure trend. Confidence is moderate (72%) because some inputs are unavailable or older than ideal.
Good for boating (75/100), from 4 available inputs. Supporting this: No active official alerts for this lake. 0% chance of precipitation. 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.
Excellent for sailing (92/100), from 4 available inputs. Supporting this: Wind 15 mph from the NW is in the preferred sailing range. No active official alerts for this lake. 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: No active official alerts for this lake. 0% chance of precipitation. Confidence is high (90%).
Surface water measured at 65°F. Air and water contrast evaluate recreational immersion comfort.
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Individual boat ramp GPS coordinates are maintained under the jurisdiction of PA Parks & Wildlife Authority. Public boaters should verify seasonal launch water levels, gate hours, and daily vehicle/vessel fees before traveling.
In PA, Blue Marsh Lake stands out as a versatile freshwater reservoir valued for its fishing waters, boating access, and scenic shoreline. Whether embarking on early morning fishing runs or enjoying midday water recreation, visitors find varied opportunities across the basin. Public facilities are overseen by state and local natural resource agencies.
Valid freshwater sport fishing license issued by Pennsylvania Fish and Boat Commission (PFBC) is required for anglers age 16+. Digital license on mobile is accepted.
Current motorized watercraft registration mandatory. Practice Clean, Drain & Dry protocols: drain all livewells and inspect props before launching. Life jackets required for all passengers.
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 Brown Trout, Brook Trout, Largemouth Bass, Green Sunfish. 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 Blue Marsh 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, 5:18 PM EDT