Isabela Weather in August
August in Isabela averages 31°C (88°F) during the day and 26°C (79°F) at night. Quite a bit of rainfall is typical this month, with around 116 mm (4.6 in) on average. An umbrella is a good idea.
Rainfall in Isabela in August
This month experiences about 19 days of rain according to historical data, averaging 116 mm (4.6 in). Expect frequent rainfall this month, and not just light drizzle. When it rains, it tends to come down hard.
Temperature in Isabela in August
Daytime temperatures in Isabela reach 31°C (88°F) in August, dropping to 26°C (79°F) at night. Mornings and evenings are often more comfortable than the peak afternoon hours. Nights are warm at 26°C (79°F). It's worth making sure your accommodation has decent ventilation or air conditioning. These are average temperatures, but there can be hotter days. Be sure to wear appropriate clothing and stay hydrated to manage the heat.August in Isabela has its charm, but if you're looking for destinations with pleasant temperatures and sunny skies, our weather planner can help you explore other options in the world.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Puerto Rico, check out our Isabela's climate page.
Isabela Temperature in August
Min Temperature
26°C (79°F)
Max Temperature
31°C (88°F)
Chance of Rain
62%
Precipitation
116 mm (4.6 in)
Rainy days
19 days
Daily Historical Temperatures
49-year average (1976-2025)
Based on our historical records, temperatures in Isabela typically stay consistent throughout August, with daily highs averaging around 31°C (88°F). Nights are warm, with lows around 24°C (75°F).
Average temperatures in August
Historical weather for Isabela in August
Browse day-by-day weather records for Isabela spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Isabela historical weather extremes in August
Based on 28 years of weather observations in Isabela between 1997 and 2025, these are the recorded extremes.
- The hottest August day on record in Isabela reached 36°C (97°F) (August 17, 2007).
- Isabela experienced its chilliest August day on August 22, 2011, reaching only 26°C (79°F).
- The lowest overnight temperature recorded in August was 20°C (68°F) (August 27, 2025).
Best Places in Puerto Rico in August
Find out more about the weather in Puerto Rico and which places have the best travel conditions in this month. See all of Puerto Rico in August →
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What to Wear in Isabela in August
Warm weather calls for comfortable, breathable clothing in August. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). High rain levels are expected, so pack waterproof gear and an umbrella or poncho.What To Do in Isabela in August
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Puerto Rico, check out our Isabela's climate page.
See the full Isabela climate overview or explore weather in Puerto Rico.
