Monthly outlook for Arenal, PR: average high 85.8°, average low 76.6°. That is 1.1° above the climate normal for October. Precipitation is expected on 11 days (about 3.2 inches), against a normal of 11 days and 2.6 inches. The warmest day looks like 27 October (90.1°), the coolest 1 November (70.7°).
85.8°/76.6°
Average high / low
+1.1°
Above normal
11 / 11
Wet days / normal
3.2 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
27 October – 5 November
86.8°
84°
+1.6°
6 November – 15 November
84.1°
83.5°
+0.4°
16 November – 25 November
at normal
83.2°
—
October records over 66 years
94.6°2 October 2023All-time high
71.8°30 October 2018All-time low
Climate normals and records are computed from the nearest reference point — Salinas (1 mi).
Wed, 2887° / 75°0.06
87 °
Arenal, Wednesday, 28 October
Light rain. High 87°, low 75°.
Pressure29.97 inHg
Wind9.6 mph SE
Humidity68%
Visibility6.2 mi
Dew point75°
Thu, 2988° / 76°0.01
88 °
Arenal, Thursday, 29 October
Light rain. High 88°, low 76°.
Pressure29.94 inHg
Wind10.6 mph SE
Humidity63%
Visibility6.2 mi
Dew point74°
Fri, 3089° / 76°0
89 °
Arenal, Friday, 30 October
Partly cloudy. High 89°, low 76°.
Pressure29.91 inHg
Wind8.9 mph SE
Humidity57%
Visibility6.2 mi
Dew point72°
Sat, 3190° / 75°0.03
90 °
Arenal, Saturday, 31 October
Light rain. High 90°, low 75°.
Pressure29.94 inHg
Wind11.9 mph SE
Humidity57%
Visibility—
Dew point71°
Sun, 0189° / 71°0.07
89 °
Arenal, Sunday, 1 November
Light rain. High 89°, low 71°.
Pressure29.94 inHg
Wind10.1 mph E
Humidity58%
Visibility—
Dew point70°
Mon, 0286° / 77°0.41
86 °
Arenal, Monday, 2 November
Rain. High 86°, low 77°.
Pressure29.94 inHg
Wind12.1 mph SE
Humidity72%
Visibility—
Dew point71°
Tue, 0384° / 76°0.62
84 °
Arenal, Tuesday, 3 November
Rain. High 84°, low 76°.
Pressure29.94 inHg
Wind9 mph E
Humidity70%
Visibility—
Dew point71°
Wed, 0484° / 78°0.65
84 °
Arenal, Wednesday, 4 November
Rain. High 84°, low 78°.
Pressure29.91 inHg
Wind7.6 mph SE
Humidity71%
Visibility—
Dew point72°
Thu, 0582° / 78°0.04
82 °
Arenal, Thursday, 5 November
Light rain. High 82°, low 78°.
Pressure29.88 inHg
Wind6.8 mph SW
Humidity70%
Visibility—
Dew point71°
Fri, 0683° / 78°0
83 °
Arenal, Friday, 6 November
Light rain. High 83°, low 78°.
Pressure29.88 inHg
Wind8.9 mph SW
Humidity71%
Visibility—
Dew point72°
Sat, 0784° / 78°0.07
84 °
Arenal, Saturday, 7 November
Light rain. High 84°, low 78°.
Pressure29.91 inHg
Wind7.3 mph SW
Humidity68%
Visibility—
Dew point71°
Sun, 0883° / 78°0.13
83 °
Arenal, Sunday, 8 November
Light rain. High 83°, low 78°.
Pressure29.94 inHg
Wind6.9 mph S
Humidity71%
Visibility—
Dew point72°
Mon, 0984° / 78°0.38
84 °
Arenal, Monday, 9 November
Rain. High 84°, low 78°.
Pressure29.94 inHg
Wind7.9 mph SE
Humidity68%
Visibility—
Dew point72°
Tue, 1086° / 77°0.07
86 °
Arenal, Tuesday, 10 November
Light rain. High 86°, low 77°.
Pressure29.94 inHg
Wind12.6 mph SE
Humidity70%
Visibility—
Dew point73°
Wed, 1185° / 79°0.01
85 °
Arenal, Wednesday, 11 November
Light rain. High 85°, low 79°.
Pressure29.97 inHg
Wind13.3 mph SE
Humidity72%
Visibility—
Dew point74°
From day 17 onward the outlook is built from 60-year climate statistics
Thu, 1283° / 76°0.14
83 °
Arenal, Thursday, 12 November
Climate normal for this date — 60-year average.
Average high83°
Average low76°
Average precipitation0.14 in
Chance of precipitation50%
Record high90° (2021)
Record low71° (1966)
Fri, 1383° / 75°0.11
83 °
Arenal, Friday, 13 November
Climate normal for this date — 60-year average.
Average high83°
Average low75°
Average precipitation0.11 in
Chance of precipitation58%
Record high88° (2021)
Record low72° (1966)
Sat, 1483° / 75°0.07
83 °
Arenal, Saturday, 14 November
Climate normal for this date — 60-year average.
Average high83°
Average low75°
Average precipitation0.07 in
Chance of precipitation53%
Record high89° (2021)
Record low71° (1966)
Sun, 1583° / 76°0.1
83 °
Arenal, Sunday, 15 November
Climate normal for this date — 60-year average.
Average high83°
Average low76°
Average precipitation0.1 in
Chance of precipitation53%
Record high89° (2019)
Record low71° (1966)
Mon, 1683° / 75°0.09
83 °
Arenal, Monday, 16 November
Climate normal for this date — 60-year average.
Average high83°
Average low75°
Average precipitation0.09 in
Chance of precipitation55%
Record high90° (2021)
Record low69° (1966)
Tue, 1783° / 75°0.13
83 °
Arenal, Tuesday, 17 November
Climate normal for this date — 60-year average.
Average high83°
Average low75°
Average precipitation0.13 in
Chance of precipitation60%
Record high90° (2021)
Record low70° (2025)
Wed, 1883° / 76°0.1
83 °
Arenal, Wednesday, 18 November
Climate normal for this date — 60-year average.
Average high83°
Average low76°
Average precipitation0.1 in
Chance of precipitation55%
Record high87° (2018)
Record low71° (1970)
Thu, 1983° / 76°0.09
83 °
Arenal, Thursday, 19 November
Climate normal for this date — 60-year average.
Average high83°
Average low76°
Average precipitation0.09 in
Chance of precipitation53%
Record high89° (2021)
Record low71° (1961)
Fri, 2083° / 75°0.07
83 °
Arenal, Friday, 20 November
Climate normal for this date — 60-year average.
Average high83°
Average low75°
Average precipitation0.07 in
Chance of precipitation52%
Record high91° (2021)
Record low70° (2024)
Sat, 2183° / 75°0.08
83 °
Arenal, Saturday, 21 November
Climate normal for this date — 60-year average.
Average high83°
Average low75°
Average precipitation0.08 in
Chance of precipitation53%
Record high89° (2025)
Record low71° (1971)
Sun, 2283° / 75°0.15
83 °
Arenal, Sunday, 22 November
Climate normal for this date — 60-year average.
Average high83°
Average low75°
Average precipitation0.15 in
Chance of precipitation68%
Record high88° (2019)
Record low69° (2025)
Mon, 2383° / 75°0.09
83 °
Arenal, Monday, 23 November
Climate normal for this date — 60-year average.
Average high83°
Average low75°
Average precipitation0.09 in
Chance of precipitation53%
Record high88° (2019)
Record low70° (2025)
Tue, 2483° / 75°0.1
83 °
Arenal, Tuesday, 24 November
Climate normal for this date — 60-year average.
Average high83°
Average low75°
Average precipitation0.1 in
Chance of precipitation43%
Record high87° (2025)
Record low70° (1963)
Wed, 2583° / 75°0.07
83 °
Arenal, Wednesday, 25 November
Climate normal for this date — 60-year average.
Average high83°
Average low75°
Average precipitation0.07 in
Chance of precipitation50%
Record high88° (2019)
Record low70° (1963)
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 Arenal, 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 Arenal, 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.