Arnold, MD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Arnold, a community in Anne Arundel County, Maryland.
This Afternoon
85°F
Mostly Sunny
Mostly sunny, with a high near 85. North wind around 10 mph.
7-day forecast for Arnold
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 85°F | Mostly Sunny | 10 mph N | 2% |
| Tonight | 63°F | Partly Cloudy | 12 mph N | 2% |
| Saturday | 79°F | Partly Sunny | 8 to 12 mph NE | 10% |
| Saturday Night | 66°F | Mostly Cloudy then Isolated Rain Showers | 10 mph SE | 20% |
| Sunday | 82°F | Chance Rain Showers | 9 to 15 mph S | 32% |
| Sunday Night | 66°F | Showers And Thunderstorms Likely | 7 to 13 mph W | 69% |
| Monday | 76°F | Chance Rain Showers | 10 to 14 mph N | 45% |
| Monday Night | 62°F | Chance Rain Showers | 9 to 13 mph NE | 47% |
| Tuesday | 70°F | Rain Showers Likely | 14 to 17 mph NE | 55% |
| Tuesday Night | 59°F | Rain Showers Likely | 14 to 17 mph NE | 55% |
| Wednesday | 68°F | Chance Rain Showers | 17 mph NE | 47% |
| Wednesday Night | 59°F | Chance Showers And Thunderstorms | 13 to 16 mph NE | 47% |
| Thursday | 68°F | Chance Showers And Thunderstorms | 16 mph NE | 39% |
| Thursday Night | 58°F | Chance Showers And Thunderstorms | 8 to 14 mph N | 34% |
Forecast source: National Weather Service (api.weather.gov) for Arnold (39.043, -76.505). Updated through the day.
Growing snapshot for Arnold
Last spring frost
Mar 27
First fall frost
Nov 13
Growing season
234 days
Hardiness zone
8a
More local growing data for Arnold: nearby ZIP 21012 weather · frost dates · planting calendar · Maryland frost dates
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Climate data from the nearest NOAA station, Annapolis Police Brks, Md (3.7 mi from Arnold). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.