Nha Trang in September: Rain Returns & Mid-Autumn Festival

September is when the rain comes back to Nha Trang. The long-term average is about 149 mm, more than double August, though it’s still well below October and November. The sea is warm, around 29°C, but boat trips become less reliable as the month goes on. The summer crowds have gone, so it’s a quiet month for temples, mud baths and the Mid-Autumn Festival. My Nha Trang travel guide covers the drier months if beach days matter most.

Weather in Nha Trang in September

• Temperature: highs around 31°C (88°F), lows around 24°C (75°F)
• Rainfall: about 149 mm, with more rainy days than summer and heavier storms later in the month
• Sea: about 29°C and warm, but rougher on stormy days

Mornings are usually the clearest time for outdoor plans. The second half of the month tends to be wetter as the main rainy season (October to December) gets closer.

Events in September

• Independence Day (2 September): National holiday — some visitors carry over from the August long weekend
• Mid-Autumn Festival (Tết Trung Thu): 15th day of the 8th lunar month, so the date varies. In 2026 it fell on 25 September. Lantern parades, dragon dances, and mooncake stalls appear across the city in the evenings — a lively cultural event worth being present for if dates align

Best Things to Do in Nha Trang in September

Po Nagar Cham Towers

September’s quieter visitor numbers make Po Nagar more enjoyable than in peak months — the hilltop shrines feel more contemplative without crowds, and the surrounding area is green as the rains return. The complex’s gardens are well-maintained and the river views from the top are worth the short climb. Entry: 30,000 VND.

Long Son Pagoda

The pagoda is well worth a morning visit in September — fewer tour groups, cooler air from the overnight rain, and the green surroundings make the temple grounds particularly appealing. The 152-step climb to the white Buddha and the hilltop views are the highlight; the mosaic work on the stairway is detailed and photogenic in the soft September morning light.

Museum of Oceanography

An excellent option for September’s rainy afternoons. Vietnam’s oldest oceanographic museum has more depth than its tourist-attraction appearance suggests — the whale skeleton in the central hall, the shark and turtle tanks, the collection of preserved sea creatures, and the underwater tunnel walkway take around 1.5–2 hours to cover properly. Entry: 40,000 VND.

Nha Trang Night Market

September evenings at the market are low-key and local — fewer tourists, more regulars, and a relaxed pace. The seafood is just as fresh and the prices are better than in peak season. Mid-Autumn Festival evenings see the market take on a festive character with lanterns and street performances; worth timing a visit for if dates allow.

Also Worth Doing

• Thap Ba Hot Springs: Mud baths and mineral pools are a natural fit for a rainy September day — the gardens are lush and the outdoor pools are pleasant between showers
• Cooking classes: A popular indoor option — several schools teach Vietnamese seafood dishes, pho, and local Nha Trang specialties
• Hon Mun Island: tours usually run in early September, but cancellations get more common later in the month. Don’t book non-refundable tours in advance.

Practical Tips for September

• Prices: the low season starts, and hotel rates drop after the summer holidays
• Flexibility: Don’t lock in outdoor activities too far in advance; September weather can change quickly
• Mid-Autumn Festival: Check the exact lunar calendar date for your visit year — the evening celebrations are the month’s highlight

FAQ

Is September a good time to visit Nha Trang?

It’s mixed. Rain rises to about 149 mm and boat trips get less reliable, but the sea is warm, the crowds are gone and it’s drier than October and November.

Is September the rainiest month in Nha Trang?

No. October and November are much wetter, with about 288 mm and 281 mm. September is when the rainy season begins.

When is the Mid-Autumn Festival in Nha Trang?

It falls on the 15th day of the 8th lunar month, usually in September or early October. Expect lanterns, lion dances and mooncake stalls in the evenings.