Monthly outlook for Cayey, PR: average high 87.3°, average low 71.6°. That is 2.2° above the climate normal for August. Precipitation is expected on 5 days (about 0.8 inches), against a normal of 10 days and 2.1 inches. The warmest day looks like 17 August (89.8°), the coolest 23 August (69.9°).
87.3°/71.6°
Average high / low
+2.2°
Above normal
5 / 10
Wet days / normal
0.8 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 August – 17 August
87.6°
83.3°
+2.4°
18 August – 27 August
86.9°
83.2°
+2.1°
28 August – 6 September
at normal
83.2°
—
August records over 66 years
89.6°12 August 1995All-time high
65.8°31 August 2021All-time low
Sun, 0988° / 72°0
88 °
Cayey, Sunday, 9 August
Light rain. High 88°, low 72°.
Pressure30.03 inHg
Wind15.3 mph E
Humidity48%
Visibility6.2 mi
Dew point68°
Mon, 1089° / 72°0
89 °
Cayey, Monday, 10 August
Light rain. High 89°, low 72°.
Pressure30.06 inHg
Wind14.9 mph E
Humidity45%
Visibility6.2 mi
Dew point66°
Tue, 1188° / 71°0
88 °
Cayey, Tuesday, 11 August
Light rain. High 88°, low 71°.
Pressure30.06 inHg
Wind12.5 mph E
Humidity49%
Visibility6.2 mi
Dew point67°
Wed, 1288° / 73°0.05
88 °
Cayey, Wednesday, 12 August
Light rain. High 88°, low 73°.
Pressure30.03 inHg
Wind13.6 mph SE
Humidity54%
Visibility6.2 mi
Dew point68°
Thu, 1384° / 72°0.04
84 °
Cayey, Thursday, 13 August
Light rain. High 84°, low 72°.
Pressure30.09 inHg
Wind16 mph E
Humidity59%
Visibility—
Dew point67°
Fri, 1487° / 72°0.04
87 °
Cayey, Friday, 14 August
Light rain. High 87°, low 72°.
Pressure30.12 inHg
Wind16.4 mph E
Humidity50%
Visibility—
Dew point63°
Sat, 1588° / 71°0.02
88 °
Cayey, Saturday, 15 August
Light rain. High 88°, low 71°.
Pressure30.09 inHg
Wind17.7 mph E
Humidity48%
Visibility—
Dew point62°
Sun, 1688° / 72°0.05
88 °
Cayey, Sunday, 16 August
Light rain. High 88°, low 72°.
Pressure30.06 inHg
Wind16.6 mph E
Humidity51%
Visibility—
Dew point64°
Mon, 1790° / 71°0
90 °
Cayey, Monday, 17 August
Light rain. High 90°, low 71°.
Pressure30.00 inHg
Wind14.3 mph E
Humidity54%
Visibility—
Dew point66°
Tue, 1886° / 72°0.5
86 °
Cayey, Tuesday, 18 August
Rain. High 86°, low 72°.
Pressure29.97 inHg
Wind6.1 mph NE
Humidity58%
Visibility—
Dew point67°
Wed, 1987° / 72°0.04
87 °
Cayey, Wednesday, 19 August
Light rain. High 87°, low 72°.
Pressure30.00 inHg
Wind13.4 mph S
Humidity64%
Visibility—
Dew point69°
Thu, 2088° / 72°0.02
88 °
Cayey, Thursday, 20 August
Light rain. High 88°, low 72°.
Pressure30.06 inHg
Wind11.9 mph SE
Humidity57%
Visibility—
Dew point67°
Fri, 2187° / 72°0.01
87 °
Cayey, Friday, 21 August
Light rain. High 87°, low 72°.
Pressure30.06 inHg
Wind12.1 mph SE
Humidity69%
Visibility—
Dew point69°
Sat, 2287° / 70°0.02
87 °
Cayey, Saturday, 22 August
Light rain. High 87°, low 70°.
Pressure30.03 inHg
Wind12.6 mph SE
Humidity64%
Visibility—
Dew point68°
Sun, 2387° / 70°0.04
87 °
Cayey, Sunday, 23 August
Light rain. High 87°, low 70°.
Pressure30.00 inHg
Wind13 mph SE
Humidity53%
Visibility—
Dew point64°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2483° / 72°0.22
83 °
Cayey, Monday, 24 August
Climate normal for this date — 60-year average.
Average high83°
Average low72°
Average precipitation0.22 in
Chance of precipitation72%
Record high88° (1963)
Record low69° (2018)
Tue, 2583° / 72°0.14
83 °
Cayey, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high83°
Average low72°
Average precipitation0.14 in
Chance of precipitation65%
Record high89° (1966)
Record low68° (2024)
Wed, 2683° / 72°0.11
83 °
Cayey, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high83°
Average low72°
Average precipitation0.11 in
Chance of precipitation70%
Record high88° (1994)
Record low69° (2024)
Thu, 2783° / 72°0.09
83 °
Cayey, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high83°
Average low72°
Average precipitation0.09 in
Chance of precipitation62%
Record high88° (1990)
Record low69° (2024)
Fri, 2883° / 72°0.17
83 °
Cayey, Friday, 28 August
Climate normal for this date — 60-year average.
Average high83°
Average low72°
Average precipitation0.17 in
Chance of precipitation78%
Record high87° (1990)
Record low69° (2022)
Sat, 2983° / 72°0.09
83 °
Cayey, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high83°
Average low72°
Average precipitation0.09 in
Chance of precipitation57%
Record high87° (1965)
Record low70° (1971)
Sun, 3083° / 72°0.21
83 °
Cayey, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high83°
Average low72°
Average precipitation0.21 in
Chance of precipitation58%
Record high88° (1967)
Record low69° (2018)
Mon, 3183° / 72°0.15
83 °
Cayey, Monday, 31 August
Climate normal for this date — 60-year average.
Average high83°
Average low72°
Average precipitation0.15 in
Chance of precipitation70%
Record high89° (1996)
Record low66° (2021)
Tue, 0183° / 72°0.1
83 °
Cayey, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high83°
Average low72°
Average precipitation0.1 in
Chance of precipitation68%
Record high88° (1996)
Record low69° (2022)
Wed, 0283° / 72°0.12
83 °
Cayey, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high83°
Average low72°
Average precipitation0.12 in
Chance of precipitation75%
Record high88° (1967)
Record low68° (2021)
Thu, 0383° / 72°0.12
83 °
Cayey, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high83°
Average low72°
Average precipitation0.12 in
Chance of precipitation60%
Record high88° (1960)
Record low69° (2020)
Fri, 0483° / 72°0.14
83 °
Cayey, Friday, 4 September
Climate normal for this date — 60-year average.
Average high83°
Average low72°
Average precipitation0.14 in
Chance of precipitation63%
Record high89° (1960)
Record low69° (2025)
Sat, 0583° / 72°0.26
83 °
Cayey, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high83°
Average low72°
Average precipitation0.26 in
Chance of precipitation63%
Record high88° (1997)
Record low67° (1961)
Sun, 0683° / 72°0.14
83 °
Cayey, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high83°
Average low72°
Average precipitation0.14 in
Chance of precipitation62%
Record high87° (1997)
Record low68° (1983)
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 Cayey, 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 Cayey, 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.