Updated
Lough Furnace (Irish: Loch na Foirnéise) is a tidally-influenced, meromictic, saline lagoon in County Mayo, Ireland, located south of Lough Feeagh. It receives freshwater inflow from the upstream Lough Feeagh at the base of the Burrishoole Catchment and tidal input of saline water from Clew Bay, through the Burrishoole Estuary. The lagoonal estuary is notable for the perennially anoxic deep water in the main inner basin.
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Weather at Furnace Lough
48°F, Patchy rain nearby · H 52° / L 40° · 93% chance of rain3-day forecast
H: 52° L: 40°
Patchy rain nearby

48°
|
Feels like 44°
Precipitation
93%
Humidity
86%
Wind
10 mph
UV Index
0.5
Weather notes:
🌧️Rain expected
12 AM

41°
3 AM

40°
6 AM

45°
9 AM

46°
12 PM

50°
3 PM

51°
6 PM

49°
9 PM

48°
Frequently asked questions
- Where is Furnace Lough?
- Furnace Lough is a lake in Connacht.
- Can you swim at Furnace Lough?
- There is no fixed answer for Furnace Lough: whether it is safe to swim there on a given day depends on the water temperature, recent rainfall, and any advisories posted at Furnace Lough in Connacht. Check current water conditions before you go, and follow posted signs and local guidance.
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Location & Contact
Connacht
🏞️ Best times & visiting tips
- ›Check for boat launch facilities and fees
- ›Obtain required fishing licenses before arrival
- ›Be aware of lake-specific regulations and restrictions
- ›Monitor water quality reports before swimming
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