92°
Chance Showers And Thunderstorms
64%
11
St. Mary's County, MD · Patuxent River
Greenwell State Park
25420 Rosedale Manor Ln, Hollywood, MD 20636
A 596-acre working-farm state park with about a mile of Patuxent River shoreline, a small sandy beach, and miles of hiker/biker/equestrian trails. One of the few Maryland parks with on-site therapeutic horseback riding.
Today's Conditions
Skip the beach today.
64% rain · Thunderstorms · High nettle risk
Full NWS forecast for This Afternoon
A chance of showers and thunderstorms. Some of the storms could be severe. Mostly cloudy, with a high near 92. Heat index values as high as 101. Southwest wind around 15 mph, with gusts as high as 22 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.
Tonight
A chance of showers and thunderstorms before 11pm, then a chance of showers and thunderstorms between 11pm and midnight, then a slight chance of showers and thunderstorms between midnight and 1am. Some of the storms could be severe. Mostly cloudy, with a low around 75. Southwest wind 7 to 14 mph, with gusts as high as 21 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.
Weather
- 92°F air — hot — hydrate and seek shade
- 64% rain — rain likely at some point
Water
- 84°F water — warm — full-day swim weather
- High nettle risk — 80% probability — reconsider swimming
Safety
- Thunderstorms — stay off the water when storms approach
- NWS alert active — severe thunderstorm watch issued july 18 at 4:33pm edt until july 18 at 9:00pm edt by nws baltimore md/washington dc
5 /100
skip
0 Swim
18 Sunbathe
0 Walk
0 Fish
19 Photo
Best for photography today
Weather alert in effect
Severe Thunderstorm Watch issued July 18 at 4:33PM EDT until July 18 at 9:00PM EDT by NWS Baltimore MD/Washington DC
Heat Advisory issued July 18 at 7:50AM EDT until July 18 at 7:00PM EDT by NWS Baltimore MD/Washington DC
Atmosphere
Air Temp
92°F
Partly Cloudy
Wind
15 mph
SW
Rain
64%
This Afternoon
UV Peak
8 Very High
High 12 PM–01 PM · burn in ~25m
Burn-free before 09 AM & after 03 PM
Tomorrow
85°F
Mostly Sunny
Water
Water Temp
84°F
Swimming weather
Sea Nettles
High nettle risk
80% probability · Gooses Reef buoy
Water Quality
Clean
10 MPN/100mL · Enterococcus
USGS · sampled 10mo ago
Sun & Moon
Sunrise
5:56 AM
Sunset
8:27 PM
Moon · 18%
Waxing Crescent
Neap tides — smaller range
7-Day Beach Day Forecast
85°
Mostly Sunny
10%
84
83°
Sunny then Slight Chance Rain Showers
15%
82
87°
Showers And Thunderstorms
79%
13
85°
Rain Showers Likely
73%
43
79°
Slight Chance Rain Showers
19%
76
82°
Sunny
14%
83
What to Bring Today
- critical SPF 50 sunscreen UV index 8 — very high
- recommended Sturdy umbrella + sand anchor 15 mph wind
- optional Swimsuit - water is swimmable Water is 84°F
- recommended Rain cover + dry bag 64% chance of rain
- critical Extra water / electrolytes 92°F - heat risk
- recommended Cooling towel or hat sustained heat
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.
Minor
10:20 PM - 11:20 PM
Major
3:40 AM - 5:40 AM
Minor
10:10 AM - 11:10 AM
Major
3:50 PM - 5:50 PM
Beach Info
Parking
Free lot near the Rosedale Manor House; short walk to the water.
Dogs
Leashed dogs welcome on trails and beach year-round.
Entry Fee
Free
Address
25420 Rosedale Manor Ln, Hollywood, MD 20636
Amenities
Frequently Asked
Is it safe to swim at Greenwell State Park today?
Greenwell State Park shows a live water-quality reading (bacteria levels) and today's swim-safety score at the top of this page, refreshed on every update. No lifeguards are on duty, so check the day's conditions and swim with caution. Always review the current advisories, surf, and rip-current notes before getting in the water.
Is Greenwell State Park dog-friendly?
Leashed dogs welcome on trails and beach year-round.
Is there an entry fee at Greenwell State Park?
Entry to Greenwell State Park is free.
Are there lifeguards at Greenwell State Park?
No lifeguards are stationed at Greenwell State Park. Swim at your own risk and keep close watch on children.
What amenities are at Greenwell State Park?
Amenities at Greenwell State Park include beach, trails, picnic area, restrooms, kayak launch, horseback riding.
When is the water warmest at Greenwell State Park?
The Patuxent warms through July to highs around 78-82°F. Best swimming window is late June through early September.
Where is Greenwell State Park located?
Greenwell State Park is in St. Mary's County, MD, at 25420 Rosedale Manor Ln, Hollywood, MD 20636.
Nearby Beaches
Updated · Data from NOAA, NWS