Arnold, MD Weather & Growing Conditions
Tonight
52°F
Mostly Clear
Mostly clear, with a low around 52. South wind 2 to 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 52°F | Mostly Clear | 2 to 6 mph S | 3% |
| Wednesday | 72°F | Patchy Fog then Mostly Sunny | 2 to 9 mph S | 3% |
| Wednesday Night | 61°F | Mostly Cloudy | 8 mph S | 13% |
| Thursday | 74°F | Chance Light Rain | 6 to 9 mph S | 44% |
| Thursday Night | 61°F | Light Rain Likely | 2 to 7 mph S | 66% |
| Friday | 70°F | Rain | 2 to 6 mph W | 78% |
| Friday Night | 51°F | Light Rain | 5 mph NW | 78% |
| Saturday | 66°F | Mostly Sunny | 6 to 10 mph NW | 12% |
| Saturday Night | 42°F | Partly Cloudy | 8 mph NW | 12% |
| Sunday | 62°F | Mostly Sunny | 8 mph W | 6% |
| Sunday Night | 42°F | Partly Cloudy then Slight Chance Light Rain | 8 mph W | 20% |
| Monday | 62°F | Slight Chance Light Rain | 9 to 13 mph W | 20% |
| Monday Night | 40°F | Slight Chance Light Rain | 6 to 9 mph W | 18% |
| Tuesday | 64°F | Sunny | 8 to 12 mph W | 14% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Arnold, MD
Last spring frost
Mar 27
First fall frost
Nov 13
Growing season
234 days
Hardiness zone
8a
Explore more for Arnold, MD: full frost dates · planting calendar · Maryland frost dates
Climate data from the nearest NOAA station, Annapolis Police Brks, Md (3.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.