Taipei records about 2405mm of rain across roughly 165 wet days a year, which is a 45% chance on an average day. September is the wettest month at 361mm (15% of the annual total) and December the driest at 73mm. Local rain type: monsoon. Taipei is extremely wet — the Keelung rain shadow makes the northern capital one of Asia's rainiest cities. Always carry an umbrella.
Chance of rain on an average day: 45%
Rainfall climatology for Taipei. 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 | 2405mm |
| Rain days per year | 165 |
| Odds on an average day | 45% |
| Wettest month | September — 361mm over 25 days |
| Driest month | December — 73mm over 5 days |
| Rain type | monsoon |
| Best dry window | October through December offers the driest conditions with comfortable temperatures. |
| Worst rain window | May through September brings typhoon season — some storms dump 500mm+ in 24 hours. |
September delivers 395% more rain than December (361mm vs 73mm). That gap is the difference between planning around showers and ignoring them.
No single month holds more than 15% of the annual total, so rain in Taipei is spread through the year — there is no season you can rely on being dry.
Taipei rain arrives in short, heavy bursts — shelter and timing matter more than gear.
Rain falls on about 25 days in September against 5 in December — 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 | 83mm | 6 | 20% | 18°C |
| February | 170mm | 12 | 40% | 18°C |
| March | 180mm | 12 | 40% | 20°C |
| April | 178mm | 12 | 40% | 24°C |
| May | 235mm | 16 | 53% | 28°C |
| June | 326mm | 22 | 73% | 32°C |
| July | 245mm | 17 | 57% | 34°C |
| August | 322mm | 22 | 73% | 34°C |
| September | 361mm | 25 | 83% | 32°C |
| October | 149mm | 10 | 33% | 28°C |
| November | 83mm | 6 | 20% | 24°C |
| December | 73mm | 5 | 17% | 20°C |
Rain probability is the chance that at least 0.2mm falls at your location — not how long it rains. For Taipei 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.
Taipei records rain on roughly 165 days a year — about a 45% chance on any given day — totalling around 2405mm.
September, with about 361mm over 25 rain days. That is 15% of the entire year's rainfall in a single month.
December is the driest month at 73mm across roughly 5 days. October through December offers the driest conditions with comfortable temperatures.
Taipei is extremely wet — the Keelung rain shadow makes the northern capital one of Asia's rainiest cities. Always carry an umbrella.
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.