By Evelyn Nguyen, May 4, 2025
September marks the end of summer and the beginning of autumn in Halong Bay. The weather starts to cool down a little, the crowds thin out after the busy summer season, and the bay slowly returns to its peaceful rhythm.
If you're looking for a quieter time to enjoy Halong Bay with fewer tourists and beautiful natural views, September is a great option. In this guide, we’ll help you get a clear picture of what the weather’s like in Halong Bay in September, what to expect during your trip, top activities to try, and useful tips in Halong Bay to help you make the most of your visit.
Halong Bay landscapes
September is a transition month in Halong Bay, the summer heat starts to ease, but it’s still very much part of the rainy and storm season.
The average daytime temperature in September ranges from 27°C to 30°C, while nighttime temperatures stay around 24°C to 26°C. The high humidity levels (around 80%) can make the air feel heavier, especially before a rainstorm. However, after the rain, the bay often feels fresh and cool.
Halong Bay in mist
Although rainfall in Halong Bay weather September is a bit lower than in August, around 180-200 mm, the risk of tropical storms is actually higher, especially during the first two weeks. These storms can bring strong winds, heavy rain, and rough seas, sometimes causing cruise delays or cancellations for safety reasons.
That said, storm warnings are usually given well in advance, and cruise operators are very experienced in adjusting schedules. If you plan to visit Halong Bay in September, it’s a good idea to keep your itinerary flexible by not booking back-to-back tight connections (like flying out the same day as your cruise ends).
When it’s not raining, you can enjoy 5–6 hours of sunshine per day. The skies after a storm can be incredibly clear and dramatic, perfect for sightseeing and photography. The sea remains warm at around 28°C, and many cruises still run on calm days, especially in the second half of the month when the weather tends to stabilize.
Quick Weather Snapshot for Halong Bay in September:
Halong Bay with fewer tourists
One of the biggest perks of traveling to Halong Bay in September is the relative quiet. Since it’s not peak season, you won’t find the bay packed with boats or the beaches crowded. It’s a great time for travelers who want a more relaxed and personal experience of the bay’s iconic limestone karsts and emerald waters.
Because September falls in the shoulder season, many cruise operators offer promotional prices or value-added deals (free kayaking, spa discounts, etc.). You can often find good-quality cruises at better rates than during peak months like December or April.
Despite the risk of rain, the sea is still very warm, around 28°C, which means it’s still comfortable for water activities. On clear days, you can enjoy swimming, kayaking through caves, or just lounging on the deck.
Kayaking from Halong Bay cruise
When to visit Halong Bay? September is one of the best times to enjoy a quieter cruise experience. With fewer tourists onboard, you’ll have more space to relax and enjoy the scenery. You can choose a day cruise or spend a night on the bay, waking up to peaceful waters and misty islets.
On clear days, kayaking is a must. Head to spots like Ba Trai Dao, Luon Cave, or Dark & Bright Cave, where you can paddle through calm emerald waters, under limestone arches, and into hidden lagoons. It’s peaceful and perfect for nature lovers.
Rain or shine, exploring Halong’s caves is always a good idea. Don’t miss Sung Sot (Surprise Cave), the largest and most impressive, or Thien Cung Cave, known for its dramatic stalactites and mysterious stories.
Titop Island
If the weather allows, take a dip at Titop Beach. The water is still warm in September. You can also climb to the top of Titop Island for one of the best panoramic views of Halong Bay.
Places like Cua Van and Vung Vieng offer a glimpse into the local way of life. Take a bamboo boat ride with a local guide, visit a floating school or fish farm, and see how people have adapted to life on the water.
When the weather turns rainy, your cruise in Halong Bay has you covered. Many include tai chi classes at sunrise, cooking demonstrations, tea or wine tastings, squid fishing at night, or spa services. It’s a great way to unwind and still experience Vietnamese culture.
Don’t miss out on enjoying freshly caught seafood, a highlight of any trip to Halong Bay. Many cruises serve seafood dishes straight from local fishermen, including prawns, squid, clams, and fresh fish.
Meal on Halong Bay cruise
September in Halong Bay is still part of the typhoon season in northern Vietnam, so storms can occasionally affect cruise schedules. Check the weather updates a few days before your trip and stay flexible in case your cruise needs to adjust or delay.
What to wear in Halong Bay in December? Bring light, breathable clothes for hot and humid days, but also pack a light raincoat or travel umbrella, just in case. A pair of non-slip shoes or sandals is great for walking on wet boat decks or exploring caves.
Choose a Halong Bay cruise with good reviews and clear cancellation/refund policies. Reputable Halong Bay operators will prioritize safety and offer alternative plans if the weather causes changes.
Do you need help planning your Halong Bay cruise in September? Get in touch with our travel consultants, We’re here to help you find the right cruise and ensure your trip goes smoothly, rain or shine!
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