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Isabela Weather in May
During May, Isabela experiences high daytime temperatures of 29°C (84°F) and cooler nights around 24°C (75°F). Expect quite a bit of rainfall. Around 142 mm (5.6 in) is typical.
Rainfall in Isabela in May
Typically around 15 days of rainfall are expected, averaging 142 mm (5.6 in) for the month. When it rains this month, it tends to come down fairly heavily. Showers can be substantial even if they don't last all day.
Temperature in Isabela in May
In May, expect high temperatures in Isabela, with highs of 29°C (84°F) and lows of 24°C (75°F) at night. Conditions stay fairly consistent through the month, making it easier to plan what to wear. With overnight lows of 24°C (75°F), evenings and nights remain warm. Light clothing and an open window or fan can help you sleep comfortably.If your ideal day consists of dry skies and pleasant temperatures, January, February, March, April and December typically offer the best circumstances for Isabela.
Isabela Temperature in May
Min Temperature
24°C (75°F)
Max Temperature
29°C (84°F)
Chance of Rain
49%
Precipitation
142 mm (5.6 in)
Rainy days
15 days
Isabela Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Isabela - and find the best time to visit.
Daily Historical Temperatures
49-year average (1976-2025)
Based on our historical records, temperatures in Isabela typically stay consistent throughout May, with daily highs averaging around 29°C (84°F). Nights are warm, with lows around 23°C (73°F).
Average temperatures in May
Historical weather records for Isabela in May
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 May
The extremes listed below come from historical weather data collected in Isabela from 1979 through 2026.
- The warmest day in May was on May 18, 1997, with a maximum of 37°C (99°F).
- On May 20, 1979, Isabela saw its coldest May day with temperatures maxing out at 23°C (73°F).
- Isabela registered its coldest May night on May 12, 2017, with temperatures dropping to 19°C (66°F).
Best Places in Puerto Rico in May
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 May →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Isabela in May
Warm temperatures in May make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Prepare for significant rainfall with proper waterproof clothing and shoes.
What To Do in Isabela in May
We rated the following activities from 1 (least suitable) to 10 (best) to do.
-
Cycling7/10 -
Walking7/10 -
Camping6/10 -
Outdoor sports7/10
Isabela 3-Day Forecast
More climate data for Isabela
See the full Isabela climate overview or explore weather in Puerto Rico.
Popular in May
Where to go in May - average daytime high across popular destinations.
San Juan
30°C (86°F) Rio Grande29°C (84°F) Aguada
29°C (84°F) Luquillo29°C (84°F) Culebra28°C (82°F) Rincon29°C (84°F) Vieques
28°C (82°F) Fajardo29°C (84°F) Bucket list
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