Port Arthur, TX climate
Port Arthur has warm winters and warm summers, with plenty of rain. A typical July afternoon reaches 91°, a January night drops to 44°, and snow is almost unheard of.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Port Arthur feels like
Winter
Spring
Summer
Fall
Port Arthur weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 62° | 44° | 5.4" | 0 | 10 | 0 | 48° – 60° |
| February | 66° | 48° | 3.4" | 0 | 8 | 0 | 47° – 65° |
| March | 72° | 53° | 3.6" | 0 | 7 | 0 | 56° – 69° |
| April | 77° | 59° | 4.0" | 0 | 6 | 0 | 64° – 72° |
| May | 84° | 67° | 4.6" | 0 | 7 | 0 | 73° – 79° |
| June | 90° | 73° | 6.6" | 0 | 10 | 0 | 80° – 84° |
| July | 91° | 75° | 6.0" | 0 | 11 | 0 | 81° – 85° |
| August | 92° | 74° | 6.7" | 0 | 11 | 0 | 80° – 87° |
| September | 88° | 70° | 6.1" | 0 | 8 | 0 | 77° – 83° |
| October | 81° | 61° | 5.3" | 0 | 7 | 0 | 67° – 76° |
| November | 71° | 51° | 4.4" | 0 | 7 | 0 | 56° – 66° |
| December | 64° | 46° | 4.9" | 0 | 9 | 0 | 47° – 61° |
| Year | 78° | 60° | 61.0" | 0.0" | 100 | 0 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Port Arthur
Port Arthur gets 61 inches of rain and melted snow a year. August is the wettest month and February the driest. Rain or snow falls on about 100 days a year.
About 301 frost-free days a year
In half of years the last 32° night comes by February 14 and the first one by December 7. That leaves about 301 frost-free days for gardens, longer than 95% of U.S. towns.
Heating and cooling a home in Port Arthur
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Port Arthur, 29% of that work is heating and 71% is cooling, so air conditioning is the bigger bill.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
Port Arthur and its neighbors
Port Arthur borders 4 towns with climate data. January nights across them vary by 0.7°. Port Neches has the coldest January nights (43°) and Nederland the hottest July afternoons (92°). Port Arthur’s January low is 44° and its July high 91°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Port Arthur compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in Port Arthur averaged 1.1° warmer than the 1900s. The biggest change is in February (+2.0°). The shift is smaller than in 66% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Port Arthur’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. February swings the most: between 1991 and 2020 its average temperature ranged from 47° to 65°. July is the most reliable, staying within 4°.
Common questions about Port Arthur’s climate
What is the coldest month in Port Arthur?
January, with a typical high of 62° and a low of 44°.
What is the hottest month in Port Arthur?
August, with a typical high of 92° and a low of 74°. About 93 days a year reach 90°.
How much snow does Port Arthur get?
Almost none. A normal year brings 0.0 inches.
When is the first frost in Port Arthur?
In half of years the first 32° night comes by December 7, and the last spring frost by February 14.
What is the rainiest month in Port Arthur?
August, with 6.7 inches of rain and melted snow. The year totals 61 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Port Arthur itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Port Arthur City, TX (5 mi, snow) and Port Arthur Se Tx Airport, TX (8 mi, frost, heat and degree days). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.