Monthly outlook for Isabel Segunda, PR: average high 83.6°, average low 82°. That is 0.8° above the climate normal for August. Precipitation is expected on 6 days (about 1.2 inches), against a normal of 12 days and 3.2 inches. The warmest day looks like 9 August (85.8°), the coolest 9 August (78.7°).
83.6°/82°
Average high / low
+0.8°
Above normal
6 / 12
Wet days / normal
1.2 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 August – 18 August
83.8°
82.2°
+0.9°
19 August – 28 August
83.2°
82.3°
+0.5°
29 August – 7 September
at normal
82.4°
—
August records over 66 years
86.5°19 August 2023All-time high
74.8°12 August 2025All-time low
Climate normals and records are computed from the nearest reference point — Vieques (0 mi).
Mon, 1085° / 83°0
85 °
Isabel Segunda, Monday, 10 August
Overcast. High 85°, low 83°.
Pressure30.06 inHg
Wind17.3 mph E
Humidity75%
Visibility6.2 mi
Dew point75°
Tue, 1184° / 83°0.22
84 °
Isabel Segunda, Tuesday, 11 August
Light rain. High 84°, low 83°.
Pressure30.03 inHg
Wind17.1 mph E
Humidity74%
Visibility6.2 mi
Dew point74°
Wed, 1284° / 82°0.3
84 °
Isabel Segunda, Wednesday, 12 August
Rain. High 84°, low 82°.
Pressure30.03 inHg
Wind16.7 mph E
Humidity77%
Visibility6.2 mi
Dew point75°
Thu, 1383° / 83°0.03
83 °
Isabel Segunda, Thursday, 13 August
Light rain. High 83°, low 83°.
Pressure30.09 inHg
Wind24.2 mph E
Humidity74%
Visibility—
Dew point74°
Fri, 1483° / 83°0.04
83 °
Isabel Segunda, Friday, 14 August
Light rain. High 83°, low 83°.
Pressure30.12 inHg
Wind24.5 mph E
Humidity74%
Visibility—
Dew point74°
Sat, 1583° / 83°0.04
83 °
Isabel Segunda, Saturday, 15 August
Light rain. High 83°, low 83°.
Pressure30.06 inHg
Wind26.3 mph E
Humidity78%
Visibility—
Dew point75°
Sun, 1683° / 82°0.02
83 °
Isabel Segunda, Sunday, 16 August
Light rain. High 83°, low 82°.
Pressure30.03 inHg
Wind21.4 mph E
Humidity75%
Visibility—
Dew point74°
Mon, 1783° / 82°0
83 °
Isabel Segunda, Monday, 17 August
Overcast. High 83°, low 82°.
Pressure29.97 inHg
Wind16.9 mph E
Humidity70%
Visibility—
Dew point71°
Tue, 1883° / 82°0
83 °
Isabel Segunda, Tuesday, 18 August
Light rain. High 83°, low 82°.
Pressure30.03 inHg
Wind9.6 mph E
Humidity75%
Visibility—
Dew point74°
Wed, 1983° / 82°0
83 °
Isabel Segunda, Wednesday, 19 August
Clear. High 83°, low 82°.
Pressure30.03 inHg
Wind12 mph NE
Humidity75%
Visibility—
Dew point73°
Thu, 2083° / 81°0
83 °
Isabel Segunda, Thursday, 20 August
Clear. High 83°, low 81°.
Pressure30.03 inHg
Wind8 mph NE
Humidity73%
Visibility—
Dew point72°
Fri, 2183° / 81°0.03
83 °
Isabel Segunda, Friday, 21 August
Light rain. High 83°, low 81°.
Pressure29.97 inHg
Wind9.1 mph SE
Humidity72%
Visibility—
Dew point72°
Sat, 2283° / 82°0.01
83 °
Isabel Segunda, Saturday, 22 August
Light rain. High 83°, low 82°.
Pressure29.97 inHg
Wind14.5 mph E
Humidity75%
Visibility—
Dew point73°
Sun, 2384° / 82°0.2
84 °
Isabel Segunda, Sunday, 23 August
Rain. High 84°, low 82°.
Pressure30.00 inHg
Wind18.4 mph E
Humidity78%
Visibility—
Dew point75°
Mon, 2483° / 83°0.29
83 °
Isabel Segunda, Monday, 24 August
Light rain. High 83°, low 83°.
Pressure30.03 inHg
Wind19 mph E
Humidity76%
Visibility—
Dew point75°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2582° / 79°0.17
82 °
Isabel Segunda, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high82°
Average low79°
Average precipitation0.17 in
Chance of precipitation73%
Record high85° (2025)
Record low75° (1972)
Wed, 2682° / 79°0.13
82 °
Isabel Segunda, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high82°
Average low79°
Average precipitation0.13 in
Chance of precipitation80%
Record high85° (2025)
Record low77° (1972)
Thu, 2782° / 79°0.13
82 °
Isabel Segunda, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high82°
Average low79°
Average precipitation0.13 in
Chance of precipitation72%
Record high86° (2023)
Record low76° (1976)
Fri, 2882° / 79°0.21
82 °
Isabel Segunda, Friday, 28 August
Climate normal for this date — 60-year average.
Average high82°
Average low79°
Average precipitation0.21 in
Chance of precipitation78%
Record high87° (2023)
Record low76° (1970)
Sat, 2982° / 79°0.14
82 °
Isabel Segunda, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high82°
Average low79°
Average precipitation0.14 in
Chance of precipitation75%
Record high86° (2023)
Record low76° (1971)
Sun, 3082° / 79°0.26
82 °
Isabel Segunda, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high82°
Average low79°
Average precipitation0.26 in
Chance of precipitation77%
Record high86° (2023)
Record low75° (2022)
Mon, 3182° / 79°0.19
82 °
Isabel Segunda, Monday, 31 August
Climate normal for this date — 60-year average.
Average high82°
Average low79°
Average precipitation0.19 in
Chance of precipitation82%
Record high86° (2004)
Record low76° (1964)
Tue, 0182° / 79°0.13
82 °
Isabel Segunda, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high82°
Average low79°
Average precipitation0.13 in
Chance of precipitation70%
Record high86° (2024)
Record low75° (1986)
Wed, 0282° / 79°0.17
82 °
Isabel Segunda, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high82°
Average low79°
Average precipitation0.17 in
Chance of precipitation73%
Record high86° (2023)
Record low76° (1974)
Thu, 0382° / 79°0.13
82 °
Isabel Segunda, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high82°
Average low79°
Average precipitation0.13 in
Chance of precipitation68%
Record high85° (2023)
Record low76° (1974)
Fri, 0482° / 80°0.19
82 °
Isabel Segunda, Friday, 4 September
Climate normal for this date — 60-year average.
Average high82°
Average low80°
Average precipitation0.19 in
Chance of precipitation60%
Record high87° (2023)
Record low76° (1971)
Sat, 0582° / 79°0.26
82 °
Isabel Segunda, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high82°
Average low79°
Average precipitation0.26 in
Chance of precipitation70%
Record high85° (2023)
Record low77° (1970)
Sun, 0682° / 79°0.2
82 °
Isabel Segunda, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high82°
Average low79°
Average precipitation0.2 in
Chance of precipitation68%
Record high85° (2023)
Record low77° (2006)
Mon, 0782° / 79°0.17
82 °
Isabel Segunda, Monday, 7 September
Climate normal for this date — 60-year average.
Average high82°
Average low79°
Average precipitation0.17 in
Chance of precipitation80%
Record high85° (2023)
Record low76° (2022)
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 Isabel Segunda, PR 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 Isabel Segunda, PR 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.