Monthly outlook for Port Isabel, TX: average high 78.8°, average low 71.2°. That is 1.2° above the climate normal for November. Precipitation is expected on 5 days (about 1.9 inches), against a normal of 5 days and 1.3 inches. The warmest day looks like 2 November (89°), the coolest 17 November (63.6°).
78.8°/71.2°
Average high / low
+1.2°
Above normal
5 / 5
Wet days / normal
1.9 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
2 November – 11 November
80.7°
77.5°
+1.8°
12 November – 21 November
75.7°
75.2°
+0.3°
22 November – 1 December
at normal
73.4°
—
November records over 66 years
91°8 November 2025All-time high
37.2°12 November 2019All-time low
Climate normals and records are computed from the nearest reference point — Laguna Heights (2 mi).
Tue, 0385° / 78°0.01
85 °
Port Isabel, Tuesday, 3 November
Light rain. High 85°, low 78°.
Pressure29.88 inHg
Wind9.8 mph SE
Humidity66%
Visibility6.2 mi
Dew point72°
Wed, 0480° / 75°0.1
80 °
Port Isabel, Wednesday, 4 November
Rain. High 80°, low 75°.
Pressure29.97 inHg
Wind12.7 mph NE
Humidity67%
Visibility6.2 mi
Dew point68°
Thu, 0583° / 78°0.02
83 °
Port Isabel, Thursday, 5 November
Light rain. High 83°, low 78°.
Pressure29.85 inHg
Wind12.8 mph SE
Humidity71%
Visibility6.2 mi
Dew point73°
Fri, 0679° / 74°0.27
79 °
Port Isabel, Friday, 6 November
Rain. High 79°, low 74°.
Pressure29.94 inHg
Wind8.9 mph N
Humidity77%
Visibility6.2 mi
Dew point70°
Sat, 0775° / 64°0.86
75 °
Port Isabel, Saturday, 7 November
Heavy rain. High 75°, low 64°.
Pressure29.97 inHg
Wind18.6 mph N
Humidity83%
Visibility—
Dew point64°
Sun, 0878° / 67°0
78 °
Port Isabel, Sunday, 8 November
Overcast. High 78°, low 67°.
Pressure30.06 inHg
Wind16.9 mph N
Humidity57%
Visibility—
Dew point61°
Mon, 0979° / 73°0
79 °
Port Isabel, Monday, 9 November
Clear. High 79°, low 73°.
Pressure30.18 inHg
Wind12.6 mph E
Humidity46%
Visibility—
Dew point56°
Tue, 1079° / 71°0
79 °
Port Isabel, Tuesday, 10 November
Overcast. High 79°, low 71°.
Pressure30.18 inHg
Wind17 mph SE
Humidity51%
Visibility—
Dew point58°
Wed, 1181° / 73°0
81 °
Port Isabel, Wednesday, 11 November
Partly cloudy. High 81°, low 73°.
Pressure30.06 inHg
Wind20.2 mph S
Humidity55%
Visibility—
Dew point62°
Thu, 1282° / 74°0
82 °
Port Isabel, Thursday, 12 November
Overcast. High 82°, low 74°.
Pressure30.03 inHg
Wind14.1 mph S
Humidity56%
Visibility—
Dew point63°
Fri, 1381° / 75°0.05
81 °
Port Isabel, Friday, 13 November
Light rain. High 81°, low 75°.
Pressure29.91 inHg
Wind17.5 mph SE
Humidity57%
Visibility—
Dew point64°
Sat, 1476° / 70°0.58
76 °
Port Isabel, Saturday, 14 November
Rain. High 76°, low 70°.
Pressure29.88 inHg
Wind15.7 mph NW
Humidity65%
Visibility—
Dew point62°
Sun, 1572° / 68°0
72 °
Port Isabel, Sunday, 15 November
Partly cloudy. High 72°, low 68°.
Pressure30.00 inHg
Wind17.4 mph N
Humidity52%
Visibility—
Dew point53°
Mon, 1669° / 64°0
69 °
Port Isabel, Monday, 16 November
Clear. High 69°, low 64°.
Pressure30.12 inHg
Wind16.6 mph N
Humidity43%
Visibility—
Dew point45°
Tue, 1774° / 64°0
74 °
Port Isabel, Tuesday, 17 November
Clear. High 74°, low 64°.
Pressure30.09 inHg
Wind16.6 mph SE
Humidity53%
Visibility—
Dew point55°
From day 17 onward the outlook is built from 60-year climate statistics
Wed, 1876° / 67°0.06
76 °
Port Isabel, Wednesday, 18 November
Climate normal for this date — 60-year average.
Average high76°
Average low67°
Average precipitation0.06 in
Chance of precipitation27%
Record high90° (2024)
Record low49° (1980)
Thu, 1975° / 67°0.08
75 °
Port Isabel, Thursday, 19 November
Climate normal for this date — 60-year average.
Average high75°
Average low67°
Average precipitation0.08 in
Chance of precipitation27%
Record high87° (2025)
Record low51° (2000)
Fri, 2074° / 65°0.11
74 °
Port Isabel, Friday, 20 November
Climate normal for this date — 60-year average.
Average high74°
Average low65°
Average precipitation0.11 in
Chance of precipitation35%
Record high83° (2025)
Record low48° (2022)
Sat, 2175° / 65°0.07
75 °
Port Isabel, Saturday, 21 November
Climate normal for this date — 60-year average.
Average high75°
Average low65°
Average precipitation0.07 in
Chance of precipitation23%
Record high85° (2025)
Record low48° (2022)
Sun, 2275° / 66°0.12
75 °
Port Isabel, Sunday, 22 November
Climate normal for this date — 60-year average.
Average high75°
Average low66°
Average precipitation0.12 in
Chance of precipitation27%
Record high85° (2019)
Record low49° (2022)
Mon, 2375° / 65°0.09
75 °
Port Isabel, Monday, 23 November
Climate normal for this date — 60-year average.
Average high75°
Average low65°
Average precipitation0.09 in
Chance of precipitation28%
Record high86° (2025)
Record low49° (1979)
Tue, 2474° / 64°0.12
74 °
Port Isabel, Tuesday, 24 November
Climate normal for this date — 60-year average.
Average high74°
Average low64°
Average precipitation0.12 in
Chance of precipitation23%
Record high87° (2025)
Record low48° (1970)
Wed, 2574° / 65°0.09
74 °
Port Isabel, Wednesday, 25 November
Climate normal for this date — 60-year average.
Average high74°
Average low65°
Average precipitation0.09 in
Chance of precipitation25%
Record high88° (2025)
Record low48° (1996)
Thu, 2674° / 65°0.08
74 °
Port Isabel, Thursday, 26 November
Climate normal for this date — 60-year average.
Average high74°
Average low65°
Average precipitation0.08 in
Chance of precipitation30%
Record high85° (2020)
Record low46° (1993)
Fri, 2774° / 64°0.07
74 °
Port Isabel, Friday, 27 November
Climate normal for this date — 60-year average.
Average high74°
Average low64°
Average precipitation0.07 in
Chance of precipitation28%
Record high86° (2024)
Record low46° (1980)
Sat, 2873° / 62°0.06
73 °
Port Isabel, Saturday, 28 November
Climate normal for this date — 60-year average.
Average high73°
Average low62°
Average precipitation0.06 in
Chance of precipitation32%
Record high82° (2020)
Record low42° (1976)
Sun, 2972° / 63°0.08
72 °
Port Isabel, Sunday, 29 November
Climate normal for this date — 60-year average.
Average high72°
Average low63°
Average precipitation0.08 in
Chance of precipitation30%
Record high84° (2025)
Record low41° (2001)
Mon, 3072° / 63°0.07
72 °
Port Isabel, Monday, 30 November
Climate normal for this date — 60-year average.
Average high72°
Average low63°
Average precipitation0.07 in
Chance of precipitation35%
Record high83° (2019)
Record low46° (1976)
Tue, 0172° / 63°0.07
72 °
Port Isabel, Tuesday, 1 December
Climate normal for this date — 60-year average.
Average high72°
Average low63°
Average precipitation0.07 in
Chance of precipitation18%
Record high79° (2023)
Record low41° (2020)
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 Isabel, 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 Isabel, 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.