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Upper Mystic Lake is a lake in Massachusetts. It covers roughly 178 surface acres. Nearby alternatives include Walden Pond, Lake Attitash, and Assawompset Pond. Below you will find an hourly and 7-day forecast, wind and gust outlook, and activity scores for boating, paddling, and swimming. Check the hourly forecast and activity outlook below before heading out to Upper Mystic Lake.
Updated
No active alerts for this lake as of the last check (Oct 10, 11:59 PM EDT). Alerts are re-checked automatically; see the official source for updates.
Best excellent fishing window, averaging 93/100 across these hours. Measured water temperature 65°F. Provisional data. Wind 2 mph from the northwest. Derived from the hourly forecast; official alerts are not forecast and are checked separately.
| Metric | 3a | 4a | 5a | 6a | 7a | 8a | 9a | 10a | 11a | 12p | 1p | 2p | 3p | 4p | 5p | 6p | 7p | 8p | 9p | 10p | 11p | 12a | 1a | 2a |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp (°F) | 48° | 47° | 46° | 45° | 45° | 44° | 44° | 44° | 45° | 46° | 50° | 55° | 59° | 61° | 63° | 64° | 63° | 63° | 63° | 61° | 60° | 58° | 56° | 55° |
| Wind (kts) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 3 | 4 | 5 | 5 | 6 | 6 | 5 | 4 | 3 | 3 | 3 | 3 | 2 |
| Direction | S | S | S | SW | SW | SW | SW | SW | S | S | S | S | S | S | S | S | S | S | S | S | SE | SE | SE | E |
| Gusts (kts) | 2 | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 2 | 4 | 4 | 5 | 8 | 9 | 10 | 10 | 10 | 8 | 7 | 6 | 6 | 5 | 5 | 4 |
| Precip % | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 1% | 2% | 3% | 6% | 9% | 17% | 22% | 28% | 38% | 54% | 62% | 97% |
| Time | Temp | Wind | Gusts | Precip | Cloud | Condition |
|---|---|---|---|---|---|---|
| Sat, 11 PM EDT | 48°F | 1 mph S (180°) | 2 mph | 0% | 49% | Partly Cloudy |
| Sun, 12 AM EDT | 47°F | 1 mph S (180°) | 1 mph | 0% | 45% | Partly Cloudy |
| Sun, 1 AM EDT | 46°F | 1 mph S (180°) | 1 mph | 0% | 50% | Partly Cloudy |
| Sun, 2 AM EDT | 45°F | 1 mph SW (225°) | 2 mph | 0% | 51% | Mostly Cloudy |
| Sun, 3 AM EDT | 45°F | 1 mph SW (225°) | 2 mph | 0% | 39% | Partly Cloudy |
| Sun, 4 AM EDT | 44°F | 1 mph SW (225°) | 2 mph | 0% | 32% | Partly Cloudy |
| Sun, 5 AM EDT | 44°F | 1 mph SW (225°) | 2 mph | 0% | 35% | Partly Cloudy |
| Sun, 6 AM EDT | 44°F | 1 mph SW (225°) | 2 mph | 0% | 41% | Mostly Sunny |
| Sun, 7 AM EDT | 45°F | 1 mph S (180°) | 2 mph | 0% | 46% | Mostly Sunny |
| Sun, 8 AM EDT | 46°F | 2 mph S (180°) | 5 mph | 0% | 55% | Partly Sunny |
| Sun, 9 AM EDT | 50°F | 2 mph S (180°) | 5 mph | 0% | 59% | Partly Sunny |
| Sun, 10 AM EDT | 55°F | 3 mph S (180°) | 6 mph | 0% | 81% | Mostly Cloudy |
| Sun, 11 AM EDT | 59°F | 5 mph S (180°) | 9 mph | 1% | 86% | Mostly Cloudy |
| Sun, 12 PM EDT | 61°F | 6 mph S (180°) | 10 mph | 2% | 89% | Cloudy |
| Sun, 1 PM EDT | 63°F | 6 mph S (180°) | 12 mph | 3% | 92% | Cloudy |
| Sun, 2 PM EDT | 64°F | 7 mph S (180°) | 12 mph | 6% | 92% | Cloudy |
| Sun, 3 PM EDT | 63°F | 7 mph S (180°) | 12 mph | 9% | 93% | Cloudy |
| Sun, 4 PM EDT | 63°F | 6 mph S (180°) | 9 mph | 17% | 90% | Slight Chance Rain Showers |
| Sun, 5 PM EDT | 63°F | 5 mph S (180°) | 8 mph | 22% | 94% | Slight Chance Rain Showers |
| Sun, 6 PM EDT | 61°F | 3 mph S (180°) | 7 mph | 28% | 92% | Chance Rain Showers |
| Sun, 7 PM EDT | 60°F | 3 mph SE (135°) | 7 mph | 38% | 92% | Chance Rain Showers |
| Sun, 8 PM EDT | 58°F | 3 mph SE (135°) | 6 mph | 54% | 93% | Chance Rain Showers |
| Sun, 9 PM EDT | 56°F | 3 mph SE (135°) | 6 mph | 62% | 89% | Rain Showers Likely |
| Sun, 10 PM EDT | 55°F | 2 mph E (90°) | 5 mph | 97% | 100% | Rain Showers |
| Sun, 11 PM EDT | 55°F | 3 mph E (90°) | 5 mph | 99% | 100% | Rain Showers |
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 | Tonight 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 | Friday October 16, 2026 | Friday Night October 16, 2026 | Saturday October 17, 2026 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp (°F) | 42° | 64° | 54° | 67° | 52° | 61° | 56° | 69° | 49° | 61° | 46° | 60° | 50° | 59° |
| Wind | SE 1 mph | S 1 to 7 mph | E 2 to 7 mph | N 2 to 7 mph | N 2 to 8 mph | E 8 mph | S 7 to 10 mph | W 12 mph | NW 8 mph | NW 10 mph | NW 7 mph | SW 5 to 10 mph | SW 8 to 12 mph | W 12 to 15 mph |
| Gusts | 2 mph | 12 mph | 12 mph | 12 mph | 13 mph | 15 mph | 18 mph | 21 mph | 17 mph | 20 mph | 12 mph | 20 mph | 20 mph | 31 mph |
| Precip % | 0% | 22% | 99% | 39% | 8% | 30% | 66% | 48% | 10% | 9% | 11% | 35% | 44% | 37% |
| Forecast |
FRESH POND IN GATE HOUSE AT CAMBRIDGE, MA · Oct 10, 9:45 PM UTC
Excellent for fishing (94/100), from 6 available inputs. Supporting this: Measured water temperature 65°F. Provisional data. Wind 1 mph from the northeast. Not available from a verified source for this lake: pressure trend. Confidence is moderate (80%) because some inputs are unavailable or older than ideal.
Excellent for boating (99/100), from 4 available inputs. Supporting this: Wind 1 mph from the northeast. Gusts to 2 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 (67/100), from 4 available inputs. Supporting this: Gusts are within 1 mph of sustained wind, so the breeze is steady. No active official alerts for this lake. Working against it: Wind 1 mph is light; expect limited sailing. Not available from a verified source for this lake: visibility. Confidence is high (88%).
Good for kayaking (83/100), from 5 available inputs. Supporting this: Wind 1 mph from the northeast. Gusts to 2 mph. Combined air and water temperature is 120°F (below the 120°F safety guideline). Thermal protection recommended for paddle craft. 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 MA Parks & Wildlife Authority. Public boaters should verify seasonal launch water levels, gate hours, and daily vehicle/vessel fees before traveling.
In MA, Upper Mystic Lake stands as a valued freshwater lake offering scenic outdoor recreation and critical regional water resources. Visitors enjoy powerboating, sailing, and tranquil shoreline fishing across its varied channels. Check state agency updates for current fishing creel limits and aquatic species inspections.
Valid freshwater sport fishing license issued by Massachusetts Division of Fisheries and Wildlife (MassWildlife) is required for anglers age 15+. 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.
Low-wake cruising, electric-troll fishing craft, and quiet-water exploration. Target gamefish include Largemouth Bass, Bluegill, Pumpkinseed Sunfish, Common Carp. 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 Upper Mystic 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 10, 11:59 PM EDT