59° · Mostly clear nowSunshine pairs well with doing very little.
Park
Lake Mercer
- 4.646 reviews
- Free
Lake in the South Run area of Fairfax County with a loop trail of about 4 miles, popular with walkers and dog owners.
Quick answers
Lake Mercer in short
When is the best time to visit Lake Mercer?
It's at its best mornings and afternoons. Go in daylight. Wedar also scores every hour of the next five days against the forecast; see the best time on this page.
Is Lake Mercer indoors or outdoors?
Outdoors: best on a dry day.
Is Lake Mercer good for kids?
Yes, it welcomes children.
How much does Lake Mercer cost?
It's free to visit.
Do you need to book Lake Mercer?
No, you can walk in.
How long do you need at Lake Mercer?
About 1.5 hours.
More questions (1)Fewer questions
Where is Lake Mercer?
South Run, VA.
Status, rating and hours checked on 4 November 2026; kids, cost, booking and setting verified by the Wedar team. Where our data comes from
Right now · 11:30 am
Why it fits right now
A great call right now.
This is its best hour in the next five days.
In its favour
- Sun's out
- Best in the morning
- Outdoors
Worth knowing
- Hours unknown: check before you go
59°
Mostly clear
- Feels
- 51°
- Rain
- 0%
- Wind
- 14mph
- 12pm
60° - 1pm61°
- 2pm61°
The next five days
Best time to go
When your plans and the weather actually get along. Scored on the forecast, its opening hours and when it's at its best. Tap a time to see it.
Before you go
Plan your visit
Hours
Hours aren't listed. Call or check the website before you go.
Where and how
Good to know
- Outdoors
- Free to visit
- Walk-ins welcome
- Allow about 1.5 h
- A walk · 6.4 km
From visitors and the venue
What it's like
4.6from 46 reviews
Known for
- 4-mile loop
- Walking trail
- Dog walking
What people say
- People like:
- Pleasant walking trail, not too crowded, good lake views
For the next three hours
What to wear to go there now
Leave with a jacket. Sunglasses all day.
JacketThe whole time
SunglassesThe whole time