Monthly outlook for Port Isabel, TX: average high 78.2°, average low 70.7°. That is 0.8° above the climate normal for November. Precipitation is expected on 5 days (about 2.3 inches), against a normal of 5 days and 1.3 inches. The warmest day looks like 2 November (88.6°), the coolest 16 November (63°).
78.2°/70.7°
Average high / low
+0.8°
Above normal
5 / 5
Wet days / normal
2.3 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
2 November – 11 November
80.4°
77.5°
+1.6°
12 November – 21 November
74.5°
75.2°
-0.4°
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° / 76°0.01
85 °
Port Isabel, Tuesday, 3 November
Light rain. High 85°, low 76°.
Pressure29.88 inHg
Wind10.1 mph SE
Humidity65%
Visibility6.2 mi
Dew point72°
Wed, 0479° / 73°0.28
79 °
Port Isabel, Wednesday, 4 November
Rain. High 79°, low 73°.
Pressure29.97 inHg
Wind11.5 mph NE
Humidity61%
Visibility6.2 mi
Dew point65°
Thu, 0582° / 77°0.1
82 °
Port Isabel, Thursday, 5 November
Light rain. High 82°, low 77°.
Pressure29.85 inHg
Wind10.6 mph SE
Humidity74%
Visibility4.1 mi
Dew point73°
Fri, 0679° / 74°0.19
79 °
Port Isabel, Friday, 6 November
Light rain. High 79°, low 74°.
Pressure29.91 inHg
Wind16 mph NE
Humidity75%
Visibility—
Dew point69°
Sat, 0776° / 70°0.7
76 °
Port Isabel, Saturday, 7 November
Heavy rain. High 76°, low 70°.
Pressure29.97 inHg
Wind15.9 mph N
Humidity84%
Visibility—
Dew point66°
Sun, 0880° / 75°0.03
80 °
Port Isabel, Sunday, 8 November
Light rain. High 80°, low 75°.
Pressure30.00 inHg
Wind13.3 mph NE
Humidity58%
Visibility—
Dew point64°
Mon, 0978° / 72°0
78 °
Port Isabel, Monday, 9 November
Clear. High 78°, low 72°.
Pressure30.18 inHg
Wind13.9 mph NE
Humidity49%
Visibility—
Dew point56°
Tue, 1077° / 70°0
77 °
Port Isabel, Tuesday, 10 November
Partly cloudy. High 77°, low 70°.
Pressure30.18 inHg
Wind15 mph SE
Humidity50%
Visibility—
Dew point56°
Wed, 1179° / 73°0
79 °
Port Isabel, Wednesday, 11 November
Overcast. High 79°, low 73°.
Pressure30.09 inHg
Wind18.9 mph SE
Humidity57%
Visibility—
Dew point62°
Thu, 1279° / 73°0.91
79 °
Port Isabel, Thursday, 12 November
Heavy rain. High 79°, low 73°.
Pressure29.94 inHg
Wind16.2 mph S
Humidity71%
Visibility—
Dew point67°
Fri, 1373° / 67°0.03
73 °
Port Isabel, Friday, 13 November
Light rain. High 73°, low 67°.
Pressure30.03 inHg
Wind19.4 mph NW
Humidity73%
Visibility—
Dew point62°
Sat, 1473° / 67°0
73 °
Port Isabel, Saturday, 14 November
Light rain. High 73°, low 67°.
Pressure30.27 inHg
Wind15.9 mph N
Humidity49%
Visibility—
Dew point52°
Sun, 1572° / 64°0
72 °
Port Isabel, Sunday, 15 November
Clear. High 72°, low 64°.
Pressure30.27 inHg
Wind7.4 mph NE
Humidity47%
Visibility—
Dew point49°
Mon, 1675° / 63°0
75 °
Port Isabel, Monday, 16 November
Clear. High 75°, low 63°.
Pressure30.15 inHg
Wind7.7 mph E
Humidity41%
Visibility—
Dew point47°
Tue, 1776° / 65°0
76 °
Port Isabel, Tuesday, 17 November
Overcast. High 76°, low 65°.
Pressure30.09 inHg
Wind10.2 mph SE
Humidity42%
Visibility—
Dew point50°
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.