Central Vietnam’s rain season runs September through December, with October and November bringing the heaviest rainfall and the highest chance a typhoon shuts a road, cancels a train, or floods Hoi An’s Old Town for a few days. I live in Da Nang and run border-crossing trips through this window every year, so here’s what actually happens, month by month, and what to do about it.
Central Vietnam Rain Season 2026: Month-by-Month Snapshot
Rain and storm risk build steadily from September, peak in October-November, then ease off through December - this table sets the pattern month by month.
| Period | Rainfall level | Storm risk | What usually happens on the ground |
|---|---|---|---|
| Jan-Aug | Low | Low | Normal bus, train and ferry schedules |
| September | Rising | Rising | First named storms possible; occasional short bus delays |
| October | High | Peak | Highest chance of flooding in Hoi An, road cuts on NH1A |
| November | Highest of the year | Peak | Most likely month for Hai Van Pass closures and train reroutes |
| December | Moderate, tapering | Moderate | Fewer storms, but rivers still running high from November |
When Does Central Vietnam’s Rain Season Actually Start?
Central Vietnam’s rain season runs from September through December, overlapping directly with the region’s typhoon season. November is the single wettest month in Da Nang, averaging between 459mm and 467mm depending on which climate dataset you check, against a yearly total of roughly 2,500mm.
April sits at the opposite end, with just 77-87mm on average - the driest month of the year. If you’re planning around weather rather than price, late February through August is the safer window for Da Nang, Hoi An and Hue.
Vietnam’s central coast, from Da Nang down to Binh Thuan, absorbs the large majority of the country’s tropical cyclone landfalls, well ahead of the northern and southern coasts. Nationally, Vietnam sees roughly 4-6 landfalling storms a year, with September and October the busiest months. For 2026, the National Center for Hydro-Meteorological Forecasting (NCHMF) is tracking toward 8-10 storms and tropical depressions on the East Sea for the July-December season - in line with a normal-to-slightly-active year.
How Much Does Central Vietnam Actually Flood?
Hoi An’s Old Town floods most years, typically somewhere between late October and mid-December. In a normal flood year, water sits knee-to-waist deep on the streets closest to the river for a day or two, then drains. In a severe year, riverfront lanes can sit under 1-2 meters of water for several days running.
2025 was one of the severe years. On October 30, 2025, the Thu Bon River peaked at 5.62 meters near Hoi An - 14cm above the previous benchmark and the highest water level the town had recorded in roughly 60 years. Local officials logged more than 65,000 affected households across the Da Nang-Hue flood zone, with around 1,400 households (5,600 residents) evacuated from the worst-hit communes.
Hoi An’s own flood history is written into its buildings: the wooden column inside Quan Thang Ancient House carries painted marks from the town’s worst recorded floods, including 1964, 1999, 2007 and 2009. If you’re touring the Old Town in rain season, ask about the flood-mark columns - several heritage houses have them, and it’s a genuinely interesting five minutes that also tells you exactly how high the water has gone before.
Does the Hai Van Pass Close During Storms?
Yes. The Hai Van Pass, the mountain road connecting Da Nang and Hue, is routinely closed to traffic once a typhoon warning is active, and it reopens once wind and visibility clear. Local authorities and traffic police make the call as a storm approaches rather than on a fixed schedule, so there’s no published closure calendar to check in advance - you find out from your driver, your hotel, or a same-day travel advisory.
There’s no official count of exactly how many days the pass closes in a typical year - that statistic isn’t published by either city’s traffic police - but the pattern from named storms is consistent: closed for the duration of the active warning, reopened within a day or two once conditions settle. The U.S. Embassy in Vietnam issues seasonal advisories for central provinces through September-December that specifically flag Hai Van Pass day trips as an activity to reconsider during active storm windows.
What Happens to Buses and Trains When a Typhoon Hits?
During the October-November 2025 flooding, National Highway 1A between Hue and Da Nang suffered multiple landslide and flood cut points that isolated communities, even though the Hue-Hoi An stretch itself was back open by early November. Vietnam Railways suspended or rerouted at least 10 North-South passenger services in the same window, including the SE3, SE4, SE6, SE7 and SE21/22 lines, with the Da Nang-Hue corridor among the affected segments.
This is the part that catches independent travelers off guard: your ticket doesn’t rebook itself, and railway and bus-company hotlines get swamped the moment a storm makes the news. If you’re weighing bus versus train for the Da Nang-Hoi An leg in this window, the sleeper bus is usually the easier one to reroute same-day - trains run on fixed track that a landslide can block outright. For clients I’ve already booked, this is where I usually step in - I move you to the next available sleeper-bus seat myself the same day a route suspends, and I don’t charge a change fee for a storm-caused reschedule. You just need to tell me your new travel window and I handle the rest.
Can You Still Reach the Cham Islands in Rainy Season?
Ferry service from Cua Dai port to the Cham Islands (Cu Lao Cham) is frequently suspended for multi-day stretches during the rough-sea window from September through February, and several local operators describe the route as largely unreliable across that period. I’d treat any Cham Islands day trip booked between September and February as provisional rather than guaranteed - build a backup day into the itinerary rather than a same-day return flight right after.
Should You Still Book a Central Vietnam Trip in Rain Season?
If your dates are fixed and fall between September and December, book anyway but keep your itinerary loose. Add one buffer day around any Hai Van Pass crossing or Cham Islands ferry, plus a plan B for the Da Nang-Hue leg if you’re relying on a single train. If your dates are still flexible, shifting two or three weeks toward late November or December cuts your typhoon exposure without losing much of the season’s lower hotel prices.
If you’re routing a visa run through this corridor - say through Lao Bao, Moc Bai or Ha Tien - a storm-closed Hai Van Pass on your return leg can cost you a full day, and that matters if your current visa is running close to expiry. I build a spare day into every border-run schedule I run for clients between September and December specifically for this. Message me on Telegram with your travel window and I’ll tell you honestly whether your dates carry storm risk before you book anything.
Methodology: Where These Numbers Come From
Rainfall and temperature figures come from two independent long-run climate datasets, climate-data.org and weather-and-climate.com. They use slightly different 30-year baseline periods and station data. That’s why you’ll see two close-but-not-identical numbers for November rainfall (459mm vs 467mm) throughout this page. Storm-count figures are Vietnam-wide averages from long-term cyclone records, not a Da Nang-only figure. 2025 flood numbers (Thu Bon River level, household counts, train suspensions) come from Vietnamese state media, U.S. Embassy travel advisories, and international wire coverage published during and right after the event. Where a figure appeared in only one source - like the often-quoted 40-60% Cham Islands ferry cancellation rate - this page flags it as an estimate rather than a confirmed fact.
Frequently asked questions
Is it safe to travel to Central Vietnam during typhoon season?
Yes, most days in September-December pass with normal weather - storms are episodic, not constant. The risk is a specific multi-day window around each named storm, not the whole season. Check a forecast 5-7 days out rather than avoiding the season entirely.
What should I do if I get caught in a flood in Hoi An?
Move to higher ground immediately - most guesthouses and hotels have upper floors ready for exactly this. Don’t wade through moving water on flooded streets; currents around drains and canals are stronger than they look, and locals will point you to the safe, dry route around the Old Town.
Is Da Nang airport affected by typhoons?
Yes - Da Nang International Airport suspends flights during active typhoon landfall windows, typically for a matter of hours to a day, and airlines rebook affected passengers automatically. Build one buffer day around any late-September through November flight in or out of Da Nang if your onward connection is tight.
Do hotel and tour cancellations get refunded during storm closures?
Most Vietnamese hotels and tour operators will rebook or refund storm-cancelled bookings without a fight, since the closure is a government-issued warning rather than a customer no-show. Keep the storm advisory or the operator’s own closure notice as proof if you need to escalate a refund.
How much warning do you get before a typhoon closes roads?
Vietnamese authorities typically issue warnings 2-4 days before a storm’s expected landfall, with local traffic police confirming pass and highway closures 12-24 hours ahead of the worst weather. That’s enough time to reschedule a Hai Van Pass crossing or a ferry booking if you’re checking local news or your hotel front desk daily during storm season.
Which months have the lowest flood and typhoon risk in Central Vietnam?
February through August carries the lowest risk, with April the driest month on record at 77-87mm of rainfall. If avoiding weather disruption matters more to you than shoulder-season hotel prices, this is the window to book.