September · Palau
Best time to visit Rock Islands in September Weather, crowds & prices
Weather in Rock Islands in September
Average temperature 27°C, 553 mm of rain, about 22 days with 6+ hours of sunshine and 87% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
3.1/10
Ranked #9 of 12 months
- Avg temp
- 27°C
- Rainfall
- 553 mm
- Humidity
- 87%
- Days with 6h+ sun
- 22
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
September in Rock Islands scores 3.1/10 for sightseeing and cultural travel - ranked #9 of 12. Expect around 27°C, 553 mm of rain, and roughly 22 days with 6+ hours of sunshine this month.
Palau's Rock Islands Southern Lagoon is a protected maze of limestone islets, reefs, lagoons, beaches, and marine sites explored by licensed boat, kayak, or dive operators.
September in Rock Islands: expect compromises
September averages 27°C (80°F) and humidity near 87%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
553 mm makes this the wettest stretch of the year, though about 22 days with 6+ hours of sunshine still appear — keep an indoor fallback ready.
It scores 3.1/10 here, 9th of 12 months, against 3.2/10 in the destination's best month.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella.
Figure on mid-season pricing, with crowds are moderate.
Frequently asked
- What is the weather like in Rock Islands in September?
- In September, Rock Islands averages 27°C, 553 mm of rain, and about 22 days with 6+ hours of sunshine. Its climate-comfort score is 3.1/10.
- Is September a good time to visit Rock Islands?
- September earns a 3.1/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Rock Islands in September?
- Expect about 553 mm of rain in September. Average humidity is 87% and there are about 22 days with 6+ hours of sunshine.
Curated in Rock Islands
Tickets & experiences
Things to do in Rock Islands
Rock Islands, Palau. Live activities and tours from GetYourGuide, matched to this destination.