Updated
MacMillan Reservoir
Lake · Mahwah, New Jersey
Comfortable for a swim today
Good to swimComfortable for a swim today: water temperature is 75°F, within the comfortable 70–86°F range.
- Water temperature is 75°F, within the comfortable 70–86°F range.
- Heavy rain today can raise bacteria levels near outfalls and river mouths.
Things to Do Near MacMillan Reservoir
Top-rated tours and experiences around Mahwah, powered by Viator — free cancellation on most.
Kennecott Mill Town Tour
Private Multilingual DC City Tour (Spanish, Portuguese, English)
Water Marbling Workshop in Voorhees, NJ
We earn a commission on bookings — at no extra cost to you. Helps keep this site free.
Stay near MacMillan Reservoir
Find hotels near MacMillan Reservoir
Compare prices on Expedia — free cancellation on most rooms.
We earn a commission on bookings — at no extra cost to you. Helps keep this site free.
Comfortable for a swim today
Good to swimComfortable for a swim today: water temperature is 75°F, within the comfortable 70–86°F range.
- Water temperature is 75°F, within the comfortable 70–86°F range. — NOAA buoy BATN6, as of Aug 21, 11:30 PM UTC
- Heavy rain today can raise bacteria levels near outfalls and river mouths.
No official beach-advisory feed for New Jersey yet — follow posted signs and local guidance.
Live data from NOAA buoy BATN6 (28.3 mi away), as of Aug 21, 11:30 PM UTC.
Weather at MacMillan Reservoir
Sponsored gear checklist
Pack smarter for MacMillan Reservoir
Useful gear categories for this kind of water spot. These links open Amazon search results so you can compare current options.
As an Amazon Associate we earn from qualifying purchases.
Frequently asked questions
- Where is MacMillan Reservoir?
- MacMillan Reservoir is a lake in Mahwah, New Jersey.
- What is the water temperature at MacMillan Reservoir?
- As of August 21, 2026, the water temperature at MacMillan Reservoir in Mahwah, New Jersey is 75°F (24°C), measured by NOAA buoy BATN6, 28.3 miles away.
- Can you swim at MacMillan Reservoir?
- Comfortable for a swim today: water temperature is 75°F, within the comfortable 70–86°F range. Checked August 21, 2026.
- How is MacMillan Reservoir rated?
- MacMillan Reservoir in Mahwah, New Jersey has an average visitor rating of 4.7 out of 5, based on 61 reviews.
- What amenities does MacMillan Reservoir have?
- Visitor-listed amenities at MacMillan Reservoir include camping-nearby.
Advertisement
Visitor Reviews
Be the first to share your experience here
Join our community to share your water adventures
Earn badges as you share your experiences!
No reviews yet — share what you know
Been here? A quick note helps the next visitor plan their day. Handy things to mention:
Best Times to Visit
- ›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
</> Embed this location on your site
Paste this snippet into your website to show a live badge for MacMillan Reservoir — free to use with the included credit link.