Weather

Tall Timbers, MD

06/30/2026 05:00 PM

82°F

TEMPERATURE

Winds 14 mph SE

Sunny

Sunny, with a high near 85. Southeast wind around 14 mph, with gusts as high as 20 mph.

Alerts

You have (2) alert(s). Tap to see details.

Extreme Heat Watch

Severe

Extreme Heat Watch issued June 30 at 2:25PM EDT until July 3 at 8:00PM EDT by NWS Baltimore MD/Washington DC
NWS Baltimore MD/Washington DC
Category	Certainty	Severity
Met	Likely	Severe
Status	Urgency	Category
Actual	Future	Met
Effective	Ends	Expires
06/30/2026 02:25 PM	07/03/2026 08:00 PM	06/30/2026 10:30 PM
* WHAT...For the Heat Advisory, heat index values around 105 expected. For the Extreme Heat Watch, dangerously hot conditions with heat index values of 110 to 115 possible. * WHERE...Calvert and St. Marys Counties. * WHEN...For the Heat Advisory, from 11 AM to 8 PM EDT Wednesday. For the Extreme Heat Watch, from Thursday morning through Friday evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Dangerous heat may linger into Saturday. Prolonged extreme heat could impact power, water, and transportation systems.

Heat Advisory

Moderate

Heat Advisory issued June 30 at 2:25PM EDT until July 1 at 8:00PM EDT by NWS Baltimore MD/Washington DC
NWS Baltimore MD/Washington DC
Category	Certainty	Severity
Met	Likely	Moderate
Status	Urgency	Category
Actual	Expected	Met
Effective	Ends	Expires
06/30/2026 02:25 PM	07/01/2026 08:00 PM	06/30/2026 10:30 PM
* WHAT...For the Heat Advisory, heat index values around 105 expected. For the Extreme Heat Watch, dangerously hot conditions with heat index values of 110 to 115 possible. * WHERE...Calvert and St. Marys Counties. * WHEN...For the Heat Advisory, from 11 AM to 8 PM EDT Wednesday. For the Extreme Heat Watch, from Thursday morning through Friday evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Dangerous heat may linger into Saturday. Prolonged extreme heat could impact power, water, and transportation systems.

Moonrise

10:29 PM

Moonset

06:58 AM

Sunrise

05:46 AM

Moon Phase

Waning gibbous

Sunset

08:33 PM

Hourly Forecast

Tue, 05:00 PM

Sunny
Winds: 14 mph SE

82°

Tue, 06:00 PM

Mostly Clear
Winds: 15 mph SE

83°

Tue, 07:00 PM

Mostly Clear
Winds: 13 mph SE

82°

Tue, 08:00 PM

Mostly Clear
Winds: 13 mph S

80°

Tue, 09:00 PM

Mostly Clear
Winds: 14 mph S

78°

Tue, 10:00 PM

Mostly Clear
Winds: 14 mph S

77°

Tue, 11:00 PM

Mostly Clear
Winds: 13 mph S

76°

Wed, 12:00 AM

Mostly Clear
Winds: 13 mph S

76°

Wed, 01:00 AM

Mostly Clear
Winds: 13 mph S

75°

Wed, 02:00 AM

Partly Cloudy
Winds: 12 mph S

75°

Wed, 03:00 AM

Partly Cloudy
Winds: 12 mph S

75°

Wed, 04:00 AM

Partly Cloudy
Winds: 10 mph S

74°

Wed, 05:00 AM

Partly Cloudy
Winds: 10 mph SW

74°

Wed, 06:00 AM

Sunny
Winds: 10 mph SW

73°

Wed, 07:00 AM

Sunny
Winds: 12 mph SW

75°

Wed, 08:00 AM

Sunny
Winds: 8 mph SW

75°

Wed, 09:00 AM

Sunny
Winds: 8 mph SW

78°

Wed, 10:00 AM

Sunny
Winds: 8 mph S

81°

Wed, 11:00 AM

Sunny
Winds: 8 mph S

83°

Wed, 12:00 PM

Sunny
Winds: 8 mph S

86°

Wed, 01:00 PM

Sunny
Winds: 9 mph S

88°

Wed, 02:00 PM

Sunny
Winds: 9 mph S

89°

Wed, 03:00 PM

Sunny
Winds: 10 mph S

90°

Wed, 04:00 PM

Sunny
Winds: 13 mph SE

91°

This Afternoon

Sunny

85°

Winds: 14 mph SE

Sunny, with a high near 85. Southeast wind around 14 mph, with gusts as high as 20 mph.

Tonight

Mostly Clear

73°

Winds: 10 to 15 mph S

Mostly clear, with a low around 73. South wind 10 to 15 mph, with gusts as high as 21 mph.

Wednesday

Sunny

91°

Winds: 8 to 14 mph S

Sunny, with a high near 91. South wind 8 to 14 mph, with gusts as high as 23 mph.

Wednesday Night

Clear

75°

Winds: 9 to 15 mph S

Clear, with a low around 75. South wind 9 to 15 mph, with gusts as high as 23 mph.

Thursday

Sunny

96°

Winds: 5 to 9 mph S

Sunny, with a high near 96. South wind 5 to 9 mph.

Thursday Night

Clear

79°

Winds: 9 mph S

Clear, with a low around 79.

Friday

Sunny

98°

Winds: 7 mph SW

Sunny, with a high near 98.

Friday Night

Mostly Clear

80°

Winds: 7 mph SW

Mostly clear, with a low around 80.

Independence Day

Sunny

94°

Winds: 2 to 7 mph SW

Sunny, with a high near 94.

Saturday Night

Chance Showers And Thunderstorms

78°

Winds: 3 to 7 mph SW

A chance of showers and thunderstorms between 8pm and 2am. Partly cloudy, with a low around 78. Chance of precipitation is 30%.

Sunday

Mostly Sunny then Chance Showers And Thunderstorms

90°

Winds: 3 to 7 mph SW

A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 90. Chance of precipitation is 40%.

Sunday Night

Chance Showers And Thunderstorms

77°

Winds: 7 mph S

A chance of showers and thunderstorms. Mostly cloudy, with a low around 77. Chance of precipitation is 50%.

Monday

Showers And Thunderstorms Likely

86°

Winds: 5 to 8 mph N

A chance of rain showers before 2pm, then showers and thunderstorms likely. Partly sunny, with a high near 86. Chance of precipitation is 60%.

Monday Night

Showers And Thunderstorms Likely

75°

Winds: 5 to 8 mph S

Showers and thunderstorms likely before 2am. Mostly cloudy, with a low around 75.

Coastal Waters Forecast

National Weather Service Baltimore MD/Washington DC

FOR THE TIDAL POTOMAC AND MD PORTION OF THE CHESAPEAKE BAY.

Tidal Potomac River and Maryland portion of Chesapeake Bay. Forecasts of wave heights do not include effects of wind direction relative to tidal currents. Expect higher waves when winds are blowing against the tidal flow. Waves flat where waters are iced over. An area of high pressure will build near and south of the Mid- Atlantic through the week. A pop up shower or thunderstorm can't totally be ruled out near any bay or river breezes each afternoon, though most of the time should be dry until Friday when the high pressure begins to shift. The chance of strong thunderstorms will increase Friday into the weekend. Southerly channeling may require the issuance of Small Craft Advisories at times through Thursday.