Upper Marlboro, MD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Upper Marlboro, a town in Prince George's County, Maryland.
Tonight
63°F
Partly Cloudy
Partly cloudy, with a low around 63. North wind around 8 mph.
7-day forecast for Upper Marlboro
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 63°F | Partly Cloudy | 8 mph N | 10% |
| Saturday | 79°F | Partly Sunny | 7 to 10 mph NE | 10% |
| Saturday Night | 67°F | Mostly Cloudy | 6 to 9 mph SE | 10% |
| Sunday | 83°F | Partly Sunny then Chance Showers And Thunderstorms | 6 to 13 mph S | 32% |
| Sunday Night | 67°F | Showers And Thunderstorms Likely | 5 to 9 mph W | 64% |
| Monday | 76°F | Chance Rain Showers | 7 to 12 mph N | 43% |
| Monday Night | 63°F | Chance Rain Showers | 8 to 13 mph NE | 50% |
| Tuesday | 69°F | Rain Showers Likely | 13 to 17 mph NE | 58% |
| Tuesday Night | 58°F | Rain Showers Likely | 13 to 17 mph NE | 58% |
| Wednesday | 65°F | Chance Rain Showers | 16 mph NE | 50% |
| Wednesday Night | 57°F | Chance Showers And Thunderstorms | 12 to 15 mph NE | 49% |
| Thursday | 66°F | Chance Showers And Thunderstorms | 15 mph NE | 43% |
| Thursday Night | 56°F | Chance Showers And Thunderstorms | 7 to 14 mph N | 33% |
| Friday | 70°F | Slight Chance Rain Showers | 13 mph N | 23% |
Forecast source: National Weather Service (api.weather.gov) for Upper Marlboro (38.816, -76.754). Updated through the day.
Growing snapshot for Upper Marlboro
Last spring frost
Apr 9
First fall frost
Oct 29
Growing season
203 days
Hardiness zone
7b
More local growing data for Upper Marlboro: nearby ZIP 20772 weather · frost dates · planting calendar · Maryland frost dates
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Climate data from the nearest NOAA station, Upper Marlboro 3 Nnw, Md (5 mi from Upper Marlboro). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.