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Photo: East Across Alder Lake 2015 by Andy Arthur (CC BY 2.0) License

Alder Lake

Lake · Hardenburgh, New York

Comfortable for a swim today

Good to swim

Comfortable for a swim today: water temperature is 78°F, within the comfortable 70–86°F range.

  • Water temperature is 78°F, within the comfortable 70–86°F range.
Good to swimCool todaycamping-nearby

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Comfortable for a swim today

Good to swim

Comfortable for a swim today: water temperature is 78°F, within the comfortable 70–86°F range.

  • Water temperature is 78°F, within the comfortable 70–86°F range. NOAA buoy TKPN6, as of Aug 22, 12:18 AM UTC
Water temp
78°F
26°C

No official beach-advisory feed for New York yet — follow posted signs and local guidance.

Live data from NOAA buoy TKPN6 (37.9 mi away), as of Aug 22, 12:18 AM UTC.

Weather at Alder Lake

H: 69° L: 53°
Overcast
Overcast
63°
|
Feels like 65°
Precipitation
60%
Humidity
82%
Wind
2 mph
UV Index
0
Water Conditions:
🥶Too cold for most swimmers
12 AM
Clear
55°
3 AM
Clear
54°
6 AM
Clear
53°
9 AM
Sunny
59°
12 PM
Sunny
66°
3 PM
Sunny
68°
6 PM
Overcast
66°
9 PM
Overcast
63°

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Frequently asked questions

Where is Alder Lake?
Alder Lake is a lake in Hardenburgh, New York.
What is the water temperature at Alder Lake?
As of August 22, 2026, the water temperature at Alder Lake in Hardenburgh, New York is 78°F (26°C), measured by NOAA buoy TKPN6, 37.9 miles away.
Can you swim at Alder Lake?
Comfortable for a swim today: water temperature is 78°F, within the comfortable 70–86°F range. Checked August 22, 2026.
How is Alder Lake rated?
Alder Lake in Hardenburgh, New York has an average visitor rating of 4.7 out of 5, based on 30 reviews.
What amenities does Alder Lake have?
Visitor-listed amenities at Alder Lake include camping-nearby.

Visitor Reviews

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Best Times to Visit

🧥
Right Now
Cool weather - dress warmly
🏞️ Lakes 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
Best Seasons:
☀️ Summer (Jun-Aug)🍂 Fall (Sep-Nov)🌸 Spring (Mar-May)

Location & Contact

Hardenburgh, NY 12758

Hardenburgh, New York 12758

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Amenities

Camping nearby