Choosing the best time to visit Lan Ha Bay
The best time to visit Lan Ha Bay depends on whether your priority is a day among the limestone islands, a cabin night or time in the water. Historical rainfall at nearby Phù Liễn is lower in October and November than in the summer months, while the temperature tables show cooler winter conditions. These patterns help narrow a date, but your actual sailing depends on the weather and operating decision for that departure.
Lan Ha belongs to the Cát Bà area of Hải Phòng. A boat itinerary involves exposed travel and stops on the water, so a comfortable daytime temperature alone is a poor basis for choosing a sailing. Begin with the visit format, then leave room around the sea connection. The day-cruise guide helps if you prefer a shore base; the overnight cruise guide explains cabin trips.
Lan Ha Bay weather by month
The table uses Phù Liễn, a mainland comparison station in Hải Phòng, rather than a measuring point inside the bay. The mean maximum and minimum temperatures come from tables A.3 and A.4 of QCVN 02:2022/BXD, published on 26 September 2022. Their common reference period is unspecified here. Rainfall comes from JMA ClimatView for 1991 to 2020. Read the columns as separate historical series, with potentially different reference periods.
| Month | Mean maximum °C, QCVN 2022 edition | Mean minimum °C, QCVN 2022 edition | Rainfall mm, JMA 1991 to 2020 |
|---|---|---|---|
| January | 19.8 | 14.2 | 40.5 |
| February | 20.1 | 15.2 | 22.6 |
| March | 22.2 | 17.7 | 51.9 |
| April | 26.4 | 21.1 | 72.8 |
| May | 30.6 | 24.1 | 176.8 |
| June | 32.0 | 25.6 | 196.1 |
| July | 32.1 | 25.9 | 281.3 |
| August | 31.5 | 25.3 | 366.7 |
| September | 30.8 | 24.3 | 269.7 |
| October | 29.0 | 22.0 | 91.9 |
| November | 25.8 | 18.8 | 52.5 |
| December | 22.1 | 15.5 | 19.8 |
These are historical monthly averages, rather than a forecast for 2026 or temperature records. Island and open-water conditions can differ from the mainland station. In particular, a low rainfall figure says little about visibility or wind on the day of your cruise. Use the table to compare seasons, then use current warnings for the actual journey.
Overnight cruise
The cabin has air conditioning and a balcony; check seasonal departure dates.
Hand-picked tours, booked through Viator. Prices are indicative starting prices in US dollars (as of October 2026). Tap a tour for live availability and the current price in your currency.
Consider a cabin night for your travel dates
This cabin itinerary includes meals and onboard facilities; sailing and water activities depend on the conditions for your departure.
Summer rain and cooler winter days
May through September has higher rainfall in the JMA series, with August the wettest month in that table. If your travel dates fall in this period, prioritise a workable connection and enough flexibility to move the boat day. A long list of outdoor activities is less useful than a route you would still enjoy if the crew changes the stops. A covered cabin is accommodation on a ship, rather than a promise that the sailing will proceed.
Winter needs a different approach. The lower temperature figures make a sightseeing cruise a different proposition from a trip built mainly around swimming. Pack clothing for time on deck and choose the cabin or shore arrangement for your comfort. Sea swimming depends on local permission, safe conditions and the crew decision. Read swimming and beach access before making a water stop the purpose of your visit.
Storm alerts and the August 2026 interruption
May to November is the general cyclone-season framework for Vietnam’s eastern coast in official travel advice. It is a broad coastal risk period, rather than a calendar of local bay closures. Follow current NCHMF and JMA warnings and the departure instructions for your route. A month with comparatively low average rainfall can still require a change of plans.
News reports dated 22 August 2026 described a suspension of tourist departures from 07:00 that day. A Hải Phòng report recorded ferry services and tourist marine activities resuming from 08:00 on 26 August 2026. These dates describe that interruption, rather than a recurring August rule or a clearance for your travel date. Kayaking has separate restrictions, so the resumption of shipping should be read alongside the kayaking status guide.
Match the season to the booking
The cabin itinerary featured here includes an air-conditioned cabin with private balcony and bathtub, meals, an English-speaking guide, entrance fee and access to a pool and gym. It starts at the waiting lounge at Lot 38, Tuần Châu Marina. This is an example of a cabin format to consider for your chosen season, rather than evidence of continuous year-round sailings. Its advertised kayaking or bamboo-boat activity remains subject to the relevant operating conditions.
Build your arrival around that actual embarkation point. Avoid a tight flight connection immediately after a sea journey and keep the return instructions available offline. A shore night can be useful when separating transport from the cruise, but choose it in relation to the correct pier. The arrival guide separates Cát Bà and Bến Bèo from Tuần Châu, so a weather buffer also works geographically.
Questions before you go
Which months have less rain than summer?
October and November have lower rainfall than the summer months in the JMA Phù Liễn series. This comparison does not guarantee clear skies or calm seas.
Does the table predict this year’s weather?
It presents historical temperature tables and rainfall normals from separate series. Use current forecasts and marine warnings for your sailing date.
Did the August interruption close the bay permanently?
The reported suspension began on 22 August 2026, with a reported resumption on 26 August. Follow current departure advice for the trip you select.