Port Arthur, TX Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Port Arthur, a city in Jefferson County, Texas.
Today
90°F
Sunny
Sunny, with a high near 90. Heat index values as high as 98. West wind 0 to 10 mph. Chance of precipitation is 20%.
7-day forecast for Port Arthur
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 90°F | Sunny | 0 to 10 mph W | 15% |
| Tonight | 80°F | Mostly Clear | 5 to 15 mph SW | 9% |
| Wednesday | 88°F | Sunny then Slight Chance Showers And Thunderstorms | 0 to 10 mph SW | 21% |
| Wednesday Night | 80°F | Mostly Clear | 5 to 10 mph S | 5% |
| Thursday | 87°F | Sunny then Chance Showers And Thunderstorms | 0 to 10 mph S | 33% |
| Thursday Night | 80°F | Chance Showers And Thunderstorms then Mostly Clear | 0 to 10 mph S | 33% |
| Friday | 87°F | Sunny then Chance Showers And Thunderstorms | 0 to 10 mph SE | 35% |
| Friday Night | 79°F | Chance Showers And Thunderstorms | 0 to 10 mph SE | 35% |
| Saturday | 89°F | Chance Showers And Thunderstorms | 0 to 10 mph E | 29% |
| Saturday Night | 79°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 10 mph SE | 29% |
| Sunday | 88°F | Chance Showers And Thunderstorms | 0 to 10 mph SE | 47% |
| Sunday Night | 80°F | Chance Showers And Thunderstorms | 5 to 10 mph S | 47% |
| Monday | 88°F | Chance Showers And Thunderstorms | 0 to 10 mph S | 54% |
| Monday Night | 80°F | Chance Showers And Thunderstorms | 5 to 10 mph S | 51% |
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
Nearby towns & communities
Beaumont
Beauxart Gardens
Bevil Oaks
Central Gardens
China
Fannett
Groves
Hamshire
Nederland
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 Aug 4, 2026.