September · Philippines
Best time to visit Underground River in September Weather, crowds & prices
Weather in Underground River in September
Average temperature 28°C, 276 mm of rain, about 17 days with 6+ hours of sunshine and 82% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
3.5/10
Ranked #12 of 12 months
- Avg temp
- 28°C
- Rainfall
- 276 mm
- Humidity
- 82%
- Days with 6h+ sun
- 17
- Crowd Density
- Quiet / Uncrowded
- Average Expenses
- $ · Budget Friendly ($)
September in Underground River scores 3.5/10 for nature and wildlife travel - ranked #12 of 12. Expect around 28°C, 276 mm of rain, and roughly 17 days with 6+ hours of sunshine this month.
The Underground River on Palawan runs through a limestone cave to the sea, a UNESCO site near Puerto Princesa.
September in Underground River — the hardest end of the year
September averages 28°C (83°F) and humidity near 82%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
276 mm of rain puts this in monsoon territory — about 17 days with 6+ hours of sunshine across the whole month, and multi-day washouts are normal.
It scores 3.5/10 here, 12th of 12 months, against 6.8/10 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, footwear you can get muddy.
Plan for low-season pricing, with crowds are light for this destination.
Flexible dates? February scores 3.3 points higher here — enough to change the trip.
Frequently asked
- What is the weather like in Underground River in September?
- In September, Underground River averages 28°C, 276 mm of rain, and about 17 days with 6+ hours of sunshine. Its climate-comfort score is 3.5/10.
- Is September a good time to visit Underground River?
- September earns a 3.5/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Underground River in September?
- Expect about 276 mm of rain in September. Average humidity is 82% and there are about 17 days with 6+ hours of sunshine.
Curated in Underground River
Tickets & experiences
Things to do in Underground River
Underground River, Philippines. Live activities and tours from GetYourGuide, matched to this destination.