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
68°F
Mostly Sunny
Mostly sunny, with a high near 68. South wind around 8 mph.
7-day forecast for Arnold
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 68°F | Mostly Sunny | 8 mph S | 2% |
| Tonight | 53°F | Mostly Clear | 2 to 6 mph S | 2% |
| Wednesday | 72°F | Patchy Fog then Mostly Sunny | 1 to 9 mph S | 3% |
| Wednesday Night | 59°F | Mostly Cloudy | 7 mph S | 6% |
| Thursday | 74°F | Chance Light Rain | 5 to 9 mph S | 38% |
| Thursday Night | 60°F | Rain Likely | 2 to 7 mph S | 74% |
| Friday | 71°F | Rain | 3 to 7 mph S | 78% |
| Friday Night | 53°F | Light Rain Likely | 5 mph NW | 74% |
| Saturday | 68°F | Slight Chance Light Rain then Mostly Sunny | 5 to 8 mph NW | 15% |
| Saturday Night | 46°F | Partly Cloudy | 6 mph NW | 11% |
| Sunday | 64°F | Mostly Sunny | 7 mph NW | 8% |
| Sunday Night | 46°F | Chance Light Rain | 3 to 7 mph NW | 26% |
| Monday | 61°F | Chance Light Rain | 7 to 13 mph NW | 26% |
| Monday Night | 44°F | Slight Chance Light Rain | 9 mph NW | 24% |
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 Nov 3, 2026.