Visit the Rainbow Mountains
The Rainbow Mountain (Vinicunca) is acolored rainbow mountain that will steal your heart forever and the view from the top will take your breath away.
Windwardside in September sees high daytime temperatures of 30°C (86°F) and nighttime lows of 27°C (81°F). With the highest rainfall of the year it is wise to pack an umbrella and expect frequent showers.
If you're looking for dry conditions and comfortable temperatures, September may not be the ideal month to visit Windwardside. Our weather planner can help you explore destinations with more pleasant weather conditions.
Pick a month to see the average temperature, rainfall and sunshine in Windwardside - and find the best time to visit.
50-year average (1976-2025)
Based on our historical records, temperatures in Windwardside typically stay consistent throughout September, with daily highs averaging around 30°C (86°F). Nights are warm, with lows around 26°C (79°F).
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Browse day-by-day weather records for Windwardside spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
According to our 36 years of weather records for Windwardside, the following extremes were recorded between 1990 and 2026.
Find out more about the weather in Bonaire, St Eustatius, Saba and which places have the best travel conditions in this month. See all of Bonaire, St Eustatius, Saba in September →
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).
Warm temperatures in September make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Prepare for significant rainfall with proper waterproof clothing and shoes.
We rated the following activities from 1 (least suitable) to 10 (best) to do.
See the full Windwardside climate overview or explore weather in Bonaire, St Eustatius, Saba.
Where to go in September - average daytime high across popular destinations.
Need travel inspiration? Check out our bucket list articles and be inspired.
Visit the Rainbow Mountains
The Rainbow Mountain (Vinicunca) is acolored rainbow mountain that will steal your heart forever and the view from the top will take your breath away.
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