Hoi An records about 2070mm of rain across roughly 130 wet days a year, which is a 36% chance on an average day. October is the wettest month at 580mm (28% of the annual total) and March the driest at 15mm. Local rain type: monsoon. Hoi An has a reversed rain season — October and November bring devastating flooding while the rest of Southeast Asia dries out. February through August is mostly dry and ideal for visiting. Always check flood reports before an autumn trip.
Chance of rain on an average day: 36%
Rainfall climatology for Hoi An. The live hour-by-hour answer for today loads at the top of this page from Open-Meteo and refreshes through the day — the figures below describe a typical year, not today.
Last updated: · Live forecast data refreshes hourly.
| Annual rainfall | 2070mm |
| Rain days per year | 130 |
| Odds on an average day | 36% |
| Wettest month | October — 580mm over 30 days |
| Driest month | March — 15mm over 1 days |
| Rain type | monsoon |
| Best dry window | February through May is the driest period with warm weather, calm seas, and the best conditions for An Bang Beach. |
| Worst rain window | October and November bring extreme rainfall — over 1,000mm in two months — with serious flooding risk in the UNESCO old town. |
October delivers 3767% more rain than March (580mm vs 15mm). That gap is the difference between planning around showers and ignoring them.
28% of the year's rain falls in October alone, so Hoi An has a genuine wet season rather than evenly spread showers.
Hoi An rain arrives in short, heavy bursts — shelter and timing matter more than gear.
Rain falls on about 30 days in October against 1 in March — the frequency swing matters more for planning than the millimetre totals.
Climate normals. Use them to judge whether today's live forecast at the top of the page is typical or unusual for the season.
| Month | Rainfall | Rain days | Chance on a given day | Highs |
|---|---|---|---|---|
| January | 40mm | 3 | 10% | 25°C |
| February | 20mm | 1 | 3% | 25°C |
| March | 15mm | 1 | 3% | 26°C |
| April | 25mm | 2 | 7% | 28°C |
| May | 60mm | 4 | 13% | 31°C |
| June | 80mm | 5 | 17% | 33°C |
| July | 80mm | 5 | 17% | 34°C |
| August | 110mm | 7 | 23% | 34°C |
| September | 280mm | 18 | 60% | 33°C |
| October | 580mm | 30 | 100% | 31°C |
| November | 420mm | 27 | 90% | 28°C |
| December | 310mm | 20 | 67% | 26°C |
Rain probability is the chance that at least 0.2mm falls at your location — not how long it rains. For Hoi An we combine the hourly probability curve, expected volume in millimetres, and the city's own rainfall record into a single umbrella verdict.
| Factor | Weight | What it measures |
|---|---|---|
| Hourly probability | 40% | Peak and sustained chance of measurable rain across the next 24 hours. |
| Expected volume | 30% | Total millimetres, which separates a passing shower from a genuine soaking. |
| Timing & duration | 20% | When rain starts, when it eases, and the longest continuous dry window. |
| Local rain type | 10% | Drizzle, brief showers, thunderstorms or monsoon — each needs different gear. |
Live hourly values come from Open-Meteo and refresh through the day. Monthly rainfall figures are climate normals, so they describe a typical year rather than a forecast.
Hoi An records rain on roughly 130 days a year — about a 36% chance on any given day — totalling around 2070mm.
October, with about 580mm over 30 rain days. That is 28% of the entire year's rainfall in a single month.
March is the driest month at 15mm across roughly 1 days. February through May is the driest period with warm weather, calm seas, and the best conditions for An Bang Beach.
Hoi An has a reversed rain season — October and November bring devastating flooding while the rest of Southeast Asia dries out. February through August is mostly dry and ideal for visiting. Always check flood reports before an autumn trip.
No. Probability is the chance that at least 0.2mm of rain falls at your location at some point in the period. Check the expected millimetres alongside it: 40% with 0.4mm is a passing shower, 40% with 12mm is a soaking.