Water Island Weather in September
Water Island in September sees high temperatures, with highs around 30°C (86°F) and overnight lows of 27°C (81°F). Rainfall is at its peak this month, around 149 mm (5.9 in) on average, so waterproofs are essential.
Rainfall in Water Island in September
With this being the rainiest month, having an umbrella is essential to avoid unexpected rain. Records from the past 30 years suggest around 18 days of rain, with 149 mm (5.9 in) average for the month. Wet weather is a regular and significant part of this month. Frequent days of rain combined with high totals means proper waterproofs are worth packing.
Temperature in Water Island in September
If you're visiting Water Island in September, expect highs of 30°C (86°F) and overnight lows around 27°C (81°F). This kind of day-to-night contrast is typical for this time of year. At 27°C (81°F) overnight, the heat doesn't let up much after dark. If you're staying somewhere without air conditioning, a cold shower before bed and keeping the air moving can help.September in Water Island 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 US Virgin Islands, check out our Water Island's climate page.
Water Island Temperature in September
Min Temperature
27°C (81°F)
Max Temperature
30°C (86°F)
Chance of Rain
61%
Precipitation
149 mm (5.9 in)
Rainy days
18 days
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Water Island typically stay consistent throughout September, with daily highs averaging around 30°C (86°F). Nights are warm, with lows around 26°C (79°F).
Average temperatures in September
Daily Historical Precipitation
50-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 Water Island in September
Browse day-by-day weather records for Water Island spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Water Island historical weather extremes in September
The extremes listed below come from historical weather data collected in Water Island from 1976 through 2025.
- Water Island recorded its highest September temperature of 39°C (102°F) on September 7, 2007.
- Water Island experienced its chilliest September day on September 4, 1979, reaching only 26°C (79°F).
- Nighttime temperatures dropped to 18°C (64°F) on September 4, 1979, marking the coldest September night on record.
Best Places in US Virgin Islands in September
Find out more about the weather in US Virgin Islands and which places have the best travel conditions in this month. See all of US Virgin Islands in September →
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What to Wear in Water Island in September
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.What To Do in Water Island 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 US Virgin Islands, check out our Water Island's climate page.
See the full Water Island climate overview or explore weather in US Virgin Islands.
