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September remains solidly in typhoon season with heavy rainfall and humid conditions. Like August, it offers the island's lowest prices and nearly empty tourist attractions. For flexible travelers with strong travel insurance, it can offer an extraordinary value experience.
27–32°C (81–90°F)
Air temp
30°C (86°F)
Sea temp
Very High
Rainfall
Low
Crowds
why go
what's on
Labor Day (US)
First Monday of SeptemberObserved in Guam as a US territory.
travel tips
September typhoon risk is slightly lower than August, but still significant — check seasonal forecasts before booking.
Many tour operators and outdoor activity providers have flexible cancellation policies in wet season — confirm before booking.
Early September (first 2 weeks) carries higher risk than late September, when the season begins to ease.
common questions
Generally yes — typhoon frequency tends to decrease as September progresses toward October. If you must travel during this period, late September is marginally less risky, though the wet season officially continues through November.
August and September offer the absolute lowest hotel rates. Luxury beachfront resorts in Tumon that cost $300+/night in January can drop to $150–$180/night in September. The savings are significant, but weigh them against the weather risk.
Pack light tropical clothing and a waterproof rain jacket — rain remains frequent and heavy in September. Quick-dry fabrics are essential. Water-resistant sandals or shoes handle the daily downpours well. Bring travel insurance documents and the NOAA Pacific Typhoon Center contact. A portable power bank is useful for staying connected to weather alerts during outdoor activities.
September is best suited to indoor and resort-based activities — duty-free shopping, spa days, resort pools, and the restaurant scene are all excellent. On sunny morning windows, beach visits and snorkelling are possible. Water tour operators often have flexible cancellation policies in wet season. The sea temperature in September is at its peak (30°C), making swimming and snorkelling very comfortable on calm days.