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Ciales Weather in September
With daytime temperatures of 31°C (88°F) and nighttime lows of 24°C (75°F), September in Ciales brings very high temperatures during the day. It is also the wettest month of the year, so pack an umbrella.
Rainfall in Ciales in September
The month is marked by heavy rainfall, often coming down in intense bursts. Make sure to have a poncho to stay dry. Historically, September sees about 18 days of rain, with a monthly average of 170 mm (6.7 in). This is a wet month with frequent and often heavy showers. Both the number of rain days and the total rainfall are high.
Temperature in Ciales in September
September in Ciales sees highs of 31°C (88°F) and lows of 24°C (75°F) overnight. Mornings and evenings are often more comfortable than the peak afternoon hours. 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.
Sunshine in Ciales in September
The city usually sees around 236 hours of sunlight, indicating many sunny days , a great month for sightseeing.September in Ciales can still be great, but if you prefer pleasant temperatures along with dry and sunny conditions, our weather planner can help you explore other options in the world.
Ciales Temperature in September
Min Temperature
24°C (75°F)
Max Temperature
31°C (88°F)
Chance of Rain
60%
Precipitation
170 mm (6.7 in)
Rainy days
18 days
Humidity
76% *
Sunshine
236 hours *
Percentage Sunshine
64% *
* Data from: San Juan, Puerto Rico (50 KM, 31 Miles).
Ciales Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Ciales - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Ciales typically stay consistent throughout September, with daily highs averaging around 31°C (88°F). Nights are warm, with lows around 25°C (77°F).
Average temperatures in September
Historical weather records for Ciales in September
Browse day-by-day weather records for Ciales spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Ciales historical weather extremes in September
Based on 50 years of weather observations (1976-2026), these are the most extreme conditions recorded in Ciales.
- The hottest September day on record in Ciales reached 36°C (97°F) (September 29, 2011).
- On September 13, 1985, Ciales saw its coldest September day with temperatures maxing out at 24°C (75°F).
- The lowest overnight temperature recorded in September was 21°C (70°F) (September 27, 2025).
Best Places in Puerto Rico in September
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 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 Ciales in September
Warm but pleasant conditions in Ciales in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. It's going to pour! Pack a good poncho and prepare for very wet conditions. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.
What To Do in Ciales in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming8/10 -
Cycling7/10 -
Walking7/10 -
Camping6/10 -
Outdoor sports7/10
Ciales 3-Day Forecast
More climate data for Ciales
Temperature Rainfall Sunshine Humidity
See the full Ciales climate overview or explore weather in Puerto Rico.
Popular in September
Where to go in September - average daytime high across popular destinations.
San Juan
31°C (88°F) Fajardo30°C (86°F) Luquillo30°C (86°F) Aguada
30°C (86°F) Rincon
30°C (86°F) Rio Grande31°C (88°F) Culebra30°C (86°F) Vieques30°C (86°F) Bucket list
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