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Isla Grande Weather in September
September in Isla Grande sees daytime temperatures around 30°C (86°F) and lows of 26°C (79°F) at night. Being part of the rainy season, heavy rainfall is a regular part of the day, so pack accordingly.
Rainfall in Isla Grande in September
As part of the rainy season, Isla Grande sees around 13 days of rain in September, with an average of 210 mm (8.3 in). Rainy season showers here are typically intense, often clearing quickly but coming down hard while they last.
Temperature in Isla Grande in September
In September, Isla Grande gets high temperatures, with highs of 30°C (86°F). Nights cool to around 26°C (79°F). Conditions stay fairly consistent through the month, making it easier to plan what to wear. Nights remain warm at around 26°C (79°F). For a more comfortable sleep, a cold shower before bed and a fan or air conditioning can make a big difference.
Sunshine in Isla Grande in September
The area enjoys a balanced 173 hours of sunlight, ensuring it's neither too rainy nor too sunny.If you prefer dry days with pleasant temperatures, September may not be the ideal month to visit Isla Grande. Our weather planner can help you explore destinations with more pleasant weather conditions.
Isla Grande Temperature in September
Min Temperature
26°C (79°F)
Max Temperature
30°C (86°F)
Chance of Rain
44%
Precipitation
210 mm (8.3 in)
Rainy days
13 days
Humidity
82% *
Sunshine
173 hours *
Percentage Sunshine
47% *
* Data from: Cartagena, Colombia (33 KM, 20 Miles).
Isla Grande Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Isla Grande - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Isla Grande typically stay consistent throughout September, with daily highs averaging around 30°C (86°F). Nights are warm, with lows around 26°C (79°F).
Average temperatures in September
Historical weather records for Isla Grande in September
Browse day-by-day weather records for Isla Grande spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Isla Grande historical weather extremes in September
Based on weather observations in Isla Grande between 1995 and 2026, these are the recorded extremes during September.
- The warmest day in September was on September 29, 2014, with a maximum of 37°C (99°F).
- On September 26, 1999, Isla Grande saw its coldest September day with temperatures maxing out at 26°C (79°F).
- Isla Grande registered its coldest September night on September 20, 2022, with temperatures dropping to 18°C (64°F).
Best Places in Colombia in September
Find out more about the weather in Colombia and which places have the best travel conditions in this month. See all of Colombia in September →
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 Isla Grande in September
Warm weather calls for comfortable, breathable clothing in September. 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). Also bring a poncho, it will rain a lot! Waterproof everything you can. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.
What To Do in Isla Grande in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming7/10 -
Cycling7/10 -
Walking7/10 -
Camping7/10 -
Outdoor sports7/10
Isla Grande 3-Day Forecast
More climate data for Isla Grande
Temperature Rainfall Sunshine Humidity
See the full Isla Grande climate overview or explore weather in Colombia.
Popular in September
Where to go in September - average daytime high across popular destinations.
Cartagena
31°C (88°F) Santa Marta29°C (84°F) San Andrés30°C (86°F) Cali27°C (81°F) Medellín25°C (77°F) Pereira24°C (75°F) Bogotá
21°C (70°F) Villa de Leyva
21°C (70°F) Bucket list
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