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Hagerstown Reservoir, MD Weather Forecast
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Hagerstown Reservoir Weather Forecast
| REST OF THE OVERNIGHT | TODAY | TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY |
 |  |  |  |  | |  | | |  | |  |
| Isolated Showers | Thunderstorms | Chance of T-Storm | Mostly Sunny | Clearing | Sunny | Mostly Clear | Sunny | Chance of Showers | Chance of Showers | Partly Cloudy | Chance of Showers |
| Lo: 69°FLo: 21°C | Hi: 81°FHi: 27°C | Lo: 70°FLo: 21°C | Hi: 89°FHi: 32°C | Lo: 65°FLo: 18°C | Hi: 85°FHi: 29°C | Lo: 61°FLo: 16°C | Hi: 89°FHi: 32°C | Lo: 65°FLo: 18°C | Hi: 81°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 81°FHi: 27°C |
| POP: 20% | POP: 100% | POP: 90% | POP: 40% | POP: 40% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 312 AM EDT Sun Aug 16 2026 
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Hagerstown Reservoir Forecast Discussion
Issued: 219 AM EDT Sun Aug 16 2026
Key Messages
- 1) Severe weather and flash flooding are possible through tonight.
- 2) Thunderstorm chances return Wednesday night into Thursday.
Discussion
... KEY MESSAGE 1...Severe weather and flash flooding are possible through tonight.
Very active weather is expected over the next 12 to 24 hours, with the threat for flash flooding, damaging wind gusts, and a few tornadoes.
As of 06Z/2AM EDT, thunderstorms containing very heavy rain had prompted several Flash Flood Warni...