Port Arthur, TX Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Port Arthur, a city in Jefferson County, Texas.
Tonight
78°F
Clear
Clear, with a low around 78. Southeast wind 0 to 5 mph.
7-day forecast for Port Arthur
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 78°F | Clear | 0 to 5 mph SE | 0% |
| Saturday | 88°F | Sunny | 5 to 10 mph E | 1% |
| Saturday Night | 80°F | Mostly Clear | 0 to 10 mph SE | 0% |
| Sunday | 88°F | Sunny | 0 to 10 mph E | 9% |
| Sunday Night | 80°F | Mostly Clear | 5 to 10 mph S | 9% |
| Monday | 88°F | Mostly Sunny | 0 mph | 12% |
| Monday Night | 79°F | Mostly Clear | 0 to 5 mph SW | 12% |
| Tuesday | 92°F | Sunny | 0 to 5 mph NE | 12% |
| Tuesday Night | 80°F | Mostly Clear | 0 to 5 mph E | 12% |
| Wednesday | 91°F | Sunny | 5 to 10 mph NE | 11% |
| Wednesday Night | 78°F | Mostly Clear | 5 to 10 mph E | 11% |
| Thursday | 90°F | Sunny | 5 to 10 mph NE | 5% |
| Thursday Night | 77°F | Mostly Clear | 5 to 10 mph NE | 5% |
| Friday | 88°F | Sunny | 5 to 10 mph NE | 5% |
Forecast source: National Weather Service (api.weather.gov) for Port Arthur (29.900, -93.894). Updated through the day.
Growing snapshot for Port Arthur
Last spring frost
Feb 14
First fall frost
Dec 7
Growing season
301 days
Hardiness zone
9b
More local growing data for Port Arthur: nearby ZIP 77640 weather · frost dates · planting calendar · Texas frost dates
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Nome
Port Neches
Rose City
Taylor Landing
Climate data from the nearest NOAA station, Port Arthur Se Tx Ap, Tx (6.8 mi from Port Arthur). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.