Santiago Weather in September
September in Santiago brings very high temperatures, with daytime highs of 33°C (91°F) and nights around 22°C (72°F). Quite a bit of rainfall is expected, around 95 mm (3.7 in), so pack an umbrella.
Rainfall in Santiago in September
Typically around 15 days of rainfall are expected, averaging 95 mm (3.7 in) for the month. The rainfall pattern this month is fairly balanced. Showers tend to be moderate rather than extreme.
Temperature in Santiago in September
September in Santiago brings typical temperatures with highs around 33°C (91°F) and lows of 22°C (72°F). For most visitors, the main thing to prepare for is the heat during the day. With overnight lows of 22°C (72°F), evenings stay pleasantly warm.
Sunshine in Santiago in September
Enjoy a sunny month with about 230 hours of sunshine, the clear skies make Santiago even more beautiful.
Wind Speed in Santiago in September
Wind speeds average 2 m/s (4 knots) during September. At this speed, expect light breezes that you can feel on your face and cause leaves to rustle gently. Since this is an average, some days are calmer with barely any wind while others have more noticeable gentle breezes.If you prefer dry days with pleasant temperatures, September may not be the ideal month to visit Santiago. Our weather planner can help you explore destinations with more pleasant weather conditions.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the Dominican Republic, check out our Santiago's climate page.
Santiago Temperature in September
Min Temperature
22°C (72°F)
Max Temperature
33°C (91°F)
Chance of Rain
51%
Precipitation
95 mm (3.7 in)
Rainy days
15 days
Humidity
74%
Windspeed
2 m/s (4 knots)
Sunshine
230 hours
Percentage Sunshine
Daily Historical Temperatures
47-year average (1976-2025)
Based on our historical records, temperatures in Santiago typically stay consistent throughout September, with daily highs averaging around 33°C (91°F). Nights are warm, with lows around 24°C (75°F).
Average temperatures in September
Daily Historical Precipitation
47-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Santiago in September
Browse day-by-day weather records for Santiago spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Santiago historical weather extremes in September
Based on 26 years of weather observations (1999-2025), these are the most extreme conditions recorded in Santiago.
- The warmest day in September was on September 2, 2025, with a maximum of 37°C (99°F).
- The coldest September day was on September 19, 2022, with a maximum of 24°C (75°F).
- Santiago registered its coldest September night on September 27, 2018, with temperatures dropping to 19°C (66°F).
Best Places in the Dominican Republic in September
Find out more about the weather in the Dominican Republic and which places have the best travel conditions in this month. See all of the Dominican Republic in September →
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What to Wear in Santiago in September
Warm but pleasant conditions in Santiago 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. Expect heavy rainfall, so bring good rain protection and waterproof bags. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.What To Do in Santiago in September
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 the Dominican Republic, check out our Santiago's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed
See the full Santiago climate overview or explore weather in the Dominican Republic.
