Roseau Weather in September
September in Roseau typically sees daytime highs of 29°C (84°F) and nighttime lows of 26°C (79°F). Rainfall is also possible this month, so it's worth packing an umbrella.
Rainfall in Roseau in September
Rain is expected on roughly 23 days, totalling around 142 mm (5.6 in) for the month. 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 Roseau in September
Expect highs of 29°C (84°F) in Roseau in September, with nights dropping to around 26°C (79°F). The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. Nights are warm at 26°C (79°F), which can make sleeping uncomfortable. Keeping windows open or using a fan can help. A cold shower before bed is also a good way to cool down.
Sunshine in Roseau in September
There are approximately 212 hours of sunshine this month, resulting in mostly clear days.September in Roseau 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.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Dominica, check out our Roseau's climate page.
Roseau Temperature in September
Min Temperature
26°C (79°F)
Max Temperature
29°C (84°F)
Chance of Rain
78%
Precipitation
142 mm (5.6 in)
Rainy days
23 days
Humidity
72% *
Sunshine
212 hours *
Percentage Sunshine
*
Daily Historical Temperatures
42-year average (1976-2025)
Based on our historical records, temperatures in Roseau typically stay consistent throughout September, with daily highs averaging around 29°C (84°F). Nights are warm, with lows around 24°C (75°F).
Average temperatures in September
Historical weather for Roseau in September
Browse day-by-day weather records for Roseau spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Roseau historical weather extremes in September
Our historical data for Roseau spans 2003 to 2025, revealing these weather extremes.
- The hottest September day on record in Roseau reached 36°C (97°F) (September 14, 2023).
- On September 23, 2003, Roseau saw its coldest September day with temperatures maxing out at 27°C (81°F).
- Nighttime temperatures dropped to 9°C (48°F) on September 4, 2023, marking the coldest September night on record.
Best Places in Dominica in September
Find out more about the weather in Dominica and which places have the best travel conditions in this month. See all of Dominica in September →
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What to Wear in Roseau in September
Warm but pleasant conditions in Roseau 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. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.What To Do in Roseau 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 Dominica, check out our Roseau's climate page.
Temperature Rainfall Sunshine Humidity
See the full Roseau climate overview or explore weather in Dominica.
