86°
Mostly Sunny
4%
84
Washington County, MD · Lake
Greenbrier State Park
21843 National Pike, Boonsboro, MD 21713
42-acre man-made freshwater lake with a white-sand swim beach on South Mountain northeast of Boonsboro. Popular with DC/Baltimore day-trippers, so MD DNR now requires advance reservations on weekends/holidays Memorial Day–Labor Day.
Today's Conditions
Ideal for a beach walk.
86°F air
Full NWS forecast for Today
Mostly sunny, with a high near 86. South wind 3 to 10 mph, with gusts as high as 20 mph.
Tonight
Isolated showers and thunderstorms between 9pm and 10pm, then scattered showers and thunderstorms between 10pm and 1am, then scattered showers and thunderstorms. Mostly cloudy, with a low around 65. Southeast wind 3 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
Weather
- 86°F air — ideal beach weather
- Sunny skies — mostly sunny
85 /100
ideal
84 Sunbathe
87 Walk
76 Fish
80 Photo
Best for walking today
Water level 0.6 ft above predicted
Observed water level is running higher than the astronomical tide prediction. Expect a narrower beach, faster-rising water, and stronger near-shore currents than the tide chart suggests.
Atmosphere
Air Temp
86°F
Partly Cloudy
Wind
3 to 10 mph
S
Rain
4%
Today
UV Peak
7 High
High 11 AM–03 PM · burn in ~29m
Burn-free before 08 AM & after 06 PM
Tomorrow
86°F
Slight Chance Rain Showers then Chance Showers And Thunderstorms
Water
Water Temp
—
Next High Tide
4:06 PM
1.1 ft · in 1.4h
Water Quality
Clean
6 MPN/100mL · E. coli
USGS · sampled 10mo ago
Sun & Moon
Sunrise
5:44 AM
Sunset
8:41 PM
Moon · 80%
Waxing Gibbous
Neap tides — smaller range
Today's Tides
7-day chart →| Time | Type | Height |
|---|---|---|
| 4:20 AM | High | 1.9 ft |
| 11:36 AM | Low | 0.7 ft |
| 4:06 PM | High | 1.1 ft |
| 10:09 PM | Low | 0.4 ft |
7-Day Beach Day Forecast
86°
Slight Chance Rain Showers then Chance Showers And Thunderstorms
36%
54
81°
Showers And Thunderstorms
90%
19
84°
Partly Sunny then Slight Chance Showers And Thunderstorms
20%
54
88°
Mostly Sunny
9%
85
95°
Mostly Sunny
7%
75
98°
Mostly Sunny then Slight Chance Showers And Thunderstorms
15%
43
What to Bring Today
- recommended SPF 30 sunscreen UV index 7 — high
- recommended Umbrella or shade warm day, light wind
Always remember water bottle, trash bag (leave no trace).
Best Fishing Times Today
Solunar theory: fish activity peaks at moon transits (major) and moonrise/moonset (minor). All times local.
Major
8:10 PM - 10:10 PM
Minor
1:50 AM - 2:50 AM
Major
8:40 AM - 10:40 AM
Minor
4:50 PM - 5:50 PM
Beach Info
Parking
State park lot.
Dogs
Dogs permitted on leash in designated areas; not on swim beach.
Entry Fee
$3/person MD resident, $5/person out-of-state (May/Sep weekends); higher in-season. Advance day-use reservation required weekends & holidays Memorial Day–Labor Day.
Address
21843 National Pike, Boonsboro, MD 21713
Amenities
7-Day Tide Chart →
Full high/low predictions for the next week at Greenbrier State Park.
7-Day Weather →
Extended forecast for Greenbrier State Park from the National Weather Service.
Frequently Asked
Is Greenbrier State Park dog-friendly?
Dogs permitted on leash in designated areas; not on swim beach.
Is there an entry fee at Greenbrier State Park?
$3/person MD resident, $5/person out-of-state (May/Sep weekends); higher in-season. Advance day-use reservation required weekends & holidays Memorial Day–Labor Day.
Are there lifeguards at Greenbrier State Park?
Yes. Seasonal lifeguards patrol Greenbrier State Park during the summer swim season (typically Memorial Day through Labor Day). Outside that window, swim at your own risk.
What amenities are at Greenbrier State Park?
Amenities at Greenbrier State Park include lifeguards, beach, camping, boat launch, boat rentals, fishing, trails, restrooms.
When is the water warmest at Greenbrier State Park?
Inland lakes peak in July and August at 75-80°F and hold warmth longer than tidal beaches. Swimming comfortable from mid-June through September.
Where is Greenbrier State Park located?
Greenbrier State Park is in Washington County, MD, at 21843 National Pike, Boonsboro, MD 21713.
Nearby Beaches
Updated · Data from NOAA, NWS