As of 02:36 CDT

Weather in Port Arthur, TX

76°

Port Arthur, Sunday, 9 August, 02:36

Partly cloudy. Feels like 78°. High 88°, low 76°.

Pressure30.00 inHg

Wind4.9 mph S

Humidity89%

Visibility6.2 mi

Dew point73°

See detailed hourly forecast

Monthly outlook for Port Arthur, TX: average high 94.9°, average low 78.5°. That is 4.1° above the climate normal for August. Precipitation is expected on 3 days (about 0.4 inches), against a normal of 8 days and 2.2 inches. The warmest day looks like 21 August (100.4°), the coolest 9 August (76°).

94.9°/78.5°

Average high / low

+4.1°

Above normal

3 / 8

Wet days / normal

0.4 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
9 August – 18 August	93.3°	87.6°	+3.1°
19 August – 28 August	97.6°	87.3°	+5.7°
29 August – 7 September	at normal	86°	—

August records over 66 years

104.9°27 August 2023All-time high

67.3°9 August 1989All-time low

Mon, 1090° / 77°

0.06

90 °

Port Arthur, Monday, 10 August

Light rain. High 90°, low 77°.

Pressure30.06 inHg

Wind8.5 mph S

Humidity56%

Visibility6.2 mi

Dew point73°

Tue, 1193° / 80°

0.06

93 °

Port Arthur, Tuesday, 11 August

Light rain. High 93°, low 80°.

Pressure30.09 inHg

Wind10.1 mph S

Humidity66%

Visibility6.2 mi

Dew point76°

Wed, 1293° / 81°

93 °

Port Arthur, Wednesday, 12 August

Clear. High 93°, low 81°.

Pressure30.00 inHg

Wind10.2 mph S

Humidity51%

Visibility6.2 mi

Dew point72°

Thu, 1392° / 81°

92 °

Port Arthur, Thursday, 13 August

Light rain. High 92°, low 81°.

Pressure30.00 inHg

Wind11.9 mph S

Humidity50%

Visibility—

Dew point69°

Fri, 1493° / 80°

93 °

Port Arthur, Friday, 14 August

Clear. High 93°, low 80°.

Pressure30.06 inHg

Wind11.6 mph S

Humidity51%

Visibility—

Dew point71°

Sat, 1593° / 80°

93 °

Port Arthur, Saturday, 15 August

Overcast. High 93°, low 80°.

Pressure30.15 inHg

Wind11.9 mph S

Humidity53%

Visibility—

Dew point72°

Sun, 1697° / 76°

97 °

Port Arthur, Sunday, 16 August

Mostly clear. High 97°, low 76°.

Pressure30.15 inHg

Wind9.3 mph S

Humidity34%

Visibility—

Dew point61°

Mon, 1796° / 77°

96 °

Port Arthur, Monday, 17 August

Clear. High 96°, low 77°.

Pressure30.06 inHg

Wind9.3 mph S

Humidity35%

Visibility—

Dew point62°

Tue, 1897° / 78°

97 °

Port Arthur, Tuesday, 18 August

Mostly clear. High 97°, low 78°.

Pressure30.00 inHg

Wind9.6 mph S

Humidity37%

Visibility—

Dew point64°

Wed, 1999° / 78°

99 °

Port Arthur, Wednesday, 19 August

Overcast. High 99°, low 78°.

Pressure30.00 inHg

Wind9.9 mph S

Humidity39%

Visibility—

Dew point67°

Thu, 20100° / 78°

100 °

Port Arthur, Thursday, 20 August

Overcast. High 100°, low 78°.

Pressure29.97 inHg

Wind12.2 mph SW

Humidity35%

Visibility—

Dew point64°

Fri, 21100° / 79°

100 °

Port Arthur, Friday, 21 August

Mostly clear. High 100°, low 79°.

Pressure29.94 inHg

Wind13.1 mph S

Humidity36%

Visibility—

Dew point66°

Sat, 2295° / 79°

95 °

Port Arthur, Saturday, 22 August

Clear. High 95°, low 79°.

Pressure29.94 inHg

Wind12.5 mph S

Humidity47%

Visibility—

Dew point69°

Sun, 2395° / 78°

95 °

Port Arthur, Sunday, 23 August

Mostly clear. High 95°, low 78°.

Pressure29.94 inHg

Wind10.4 mph S

Humidity45%

Visibility—

Dew point68°

Mon, 2497° / 79°

97 °

Port Arthur, Monday, 24 August

Overcast. High 97°, low 79°.

Pressure29.97 inHg

Wind11.6 mph S

Humidity41%

Visibility—

Dew point67°

From day 17 onward the outlook is built from 60-year climate statistics

Tue, 2587° / 78°

0.16

87 °

Port Arthur, Tuesday, 25 August

Climate normal for this date — 60-year average.

Average high87°

Average low78°

Average precipitation0.16 in

Chance of precipitation62%

Record high95° (2023)

Record low70° (1966)

Wed, 2687° / 78°

0.17

87 °

Port Arthur, Wednesday, 26 August

Climate normal for this date — 60-year average.

Average high87°

Average low78°

Average precipitation0.17 in

Chance of precipitation47%

Record high98° (2023)

Record low70° (1966)

Thu, 2787° / 78°

0.25

87 °

Port Arthur, Thursday, 27 August

Climate normal for this date — 60-year average.

Average high87°

Average low78°

Average precipitation0.25 in

Chance of precipitation57%

Record high105° (2023)

Record low73° (1966)

Fri, 2887° / 78°

0.32

87 °

Port Arthur, Friday, 28 August

Climate normal for this date — 60-year average.

Average high87°

Average low78°

Average precipitation0.32 in

Chance of precipitation67%

Record high97° (2011)

Record low72° (1968)

Sat, 2986° / 77°

0.32

86 °

Port Arthur, Saturday, 29 August

Climate normal for this date — 60-year average.

Average high86°

Average low77°

Average precipitation0.32 in

Chance of precipitation50%

Record high99° (2011)

Record low71° (1986)

Sun, 3086° / 77°

0.35

86 °

Port Arthur, Sunday, 30 August

Climate normal for this date — 60-year average.

Average high86°

Average low77°

Average precipitation0.35 in

Chance of precipitation50%

Record high98° (2000)

Record low69° (2017)

Mon, 3187° / 78°

0.25

87 °

Port Arthur, Monday, 31 August

Climate normal for this date — 60-year average.

Average high87°

Average low78°

Average precipitation0.25 in

Chance of precipitation63%

Record high101° (2000)

Record low72° (2017)

Tue, 0186° / 77°

0.2

86 °

Port Arthur, Tuesday, 1 September

Climate normal for this date — 60-year average.

Average high86°

Average low77°

Average precipitation0.2 in

Chance of precipitation62%

Record high100° (2000)

Record low71° (2017)

Wed, 0286° / 77°

0.17

86 °

Port Arthur, Wednesday, 2 September

Climate normal for this date — 60-year average.

Average high86°

Average low77°

Average precipitation0.17 in

Chance of precipitation55%

Record high98° (2000)

Record low69° (1967)

Thu, 0386° / 77°

0.25

86 °

Port Arthur, Thursday, 3 September

Climate normal for this date — 60-year average.

Average high86°

Average low77°

Average precipitation0.25 in

Chance of precipitation60%

Record high98° (2000)

Record low70° (1987)

Fri, 0486° / 77°

0.27

86 °

Port Arthur, Friday, 4 September

Climate normal for this date — 60-year average.

Average high86°

Average low77°

Average precipitation0.27 in

Chance of precipitation58%

Record high101° (2000)

Record low66° (1974)

Sat, 0586° / 76°

0.26

86 °

Port Arthur, Saturday, 5 September

Climate normal for this date — 60-year average.

Average high86°

Average low76°

Average precipitation0.26 in

Chance of precipitation48%

Record high100° (2000)

Record low62° (1974)

Sun, 0685° / 76°

0.24

85 °

Port Arthur, Sunday, 6 September

Climate normal for this date — 60-year average.

Average high85°

Average low76°

Average precipitation0.24 in

Chance of precipitation47%

Record high95° (2023)

Record low63° (1974)

Mon, 0785° / 76°

0.14

85 °

Port Arthur, Monday, 7 September

Climate normal for this date — 60-year average.

Average high85°

Average low76°

Average precipitation0.14 in

Chance of precipitation50%

Record high97° (2023)

Record low66° (2017)

About the monthly outlook

How accurate is a 30-day forecast?

The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Port Arthur, TX are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.

What does "above normal" mean?

We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.

Where do the 66-year records come from?

They are real temperature extremes recorded in Port Arthur, TX since 1960: the highest and lowest reading for each calendar date, with the year it happened.

How often is it updated?

The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.