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Arnold, MD Weather Forecast
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Arnold Weather Forecast
| REST OF THIS AFTERNOON | TONIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT |
 |  |  |  | |  | | | |  | | |
| Mostly Sunny | Mostly Cloudy | Chance of Showers | Chance of T-Storm | Chance of Showers | Chance of Showers | Chance of Showers | Chance of Showers | Chance of Showers | Chance of Showers | Chance of Showers | Chance of Showers |
| Hi: 79°FHi: 26°C | Lo: 69°FLo: 21°C | Hi: 85°FHi: 29°C | Lo: 65°FLo: 18°C | Hi: 75°FHi: 24°C | Lo: 61°FLo: 16°C | Hi: 70°FHi: 21°C | Lo: 59°FLo: 15°C | Hi: 69°FHi: 21°C | Lo: 59°FLo: 15°C | Hi: 69°FHi: 21°C | Lo: 55°FLo: 13°C |
| POP: 40% | POP: 70% | POP: 50% | POP: 50% | POP: 50% | POP: 50% | POP: 50% | POP: 40% | POP: 40% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 455 PM EDT Sat Sep 19 2026 
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Issued: 333 PM EDT Sat Sep 19 2026
Key Messages
- 1) Showers and possible thunderstorms return Sunday.
- 2) Rain showers & cooler temperatures persist into midweek ahead of drier conditions next weekend.
Discussion
...
KEY MESSAGE 1...Showers and possible thunderstorms return Sunday.
Fair weather is expected through this evening. Low overcast conditions are expected to develop late this evening and through the overnight as moisture advection develops atop a shallow cool layer on SE winds. By daybreak, expect showers to move into western M...