September · Dominica
Best time to visit Roseau in September Weather, crowds & prices
Weather in Roseau in September
Average temperature 29°C, 152 mm of rain, about 27 days with 6+ hours of sunshine and 79% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
4.8/10
Ranked #10 of 12 months
- Avg temp
- 29°C
- Rainfall
- 152 mm
- Humidity
- 79%
- Days with 6h+ sun
- 27
- Crowd Density
- Quiet / Uncrowded
- Average Expenses
- $ · Budget Friendly ($)
September in Roseau scores 4.8/10 for nature and wildlife travel - ranked #10 of 12. Expect around 29°C, 152 mm of rain, and roughly 27 days with 6+ hours of sunshine this month.
Roseau is Dominica's small capital, squeezed between the sea and steep rainforest mountains.
September in Roseau — off-season conditions
Days in September average 29°C (84°F) and humidity near 79% — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.
152 mm of rain makes this a wet month here, though with about 27 days with 6+ hours of sunshine there is still bright weather between the fronts.
That is 4.8/10 on the same scale — 10th of 12 months, versus 7.3/10 for the best month here.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella, footwear you can get muddy.
Budget for low-season pricing, and crowds are light for this destination.
If your dates are flexible, February is materially better in Roseau — 2.5 points higher on the same scale.
Frequently asked
- What is the weather like in Roseau in September?
- In September, Roseau averages 29°C, 152 mm of rain, and about 27 days with 6+ hours of sunshine. Its climate-comfort score is 4.8/10.
- Is September a good time to visit Roseau?
- September earns a 4.8/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Roseau in September?
- Expect about 152 mm of rain in September. Average humidity is 79% and there are about 27 days with 6+ hours of sunshine.
Curated in Roseau
Tickets & experiences
Things to do in Roseau
Roseau, Dominica. Live activities and tours from GetYourGuide, matched to this destination.