Reunion Island records about 1800mm of rain across roughly 140 wet days a year, which is a 38% chance on an average day. January is the wettest month at 280mm (16% of the annual total) and August the driest at 40mm. Local rain type: monsoon. The west coast stays dry 300+ days per year while the east coast is one of the wettest places on Earth. Pack rain gear for the cirques and volcano but leave it at the hotel for beach days.
Chance of rain on an average day: 38%
Rainfall climatology for Reunion Island. 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 | 1800mm |
| Rain days per year | 140 |
| Odds on an average day | 38% |
| Wettest month | January — 280mm over 24 days |
| Driest month | August — 40mm over 3 days |
| Rain type | monsoon |
| Best dry window | June through September is the dry season with comfortable temperatures and the best visibility for Piton de la Fournaise volcano. |
| Worst rain window | January and February bring cyclone-season rains — the east coast can receive over 1,000mm in a single week. |
January delivers 600% more rain than August (280mm vs 40mm). That gap is the difference between planning around showers and ignoring them.
No single month holds more than 16% of the annual total, so rain in Reunion Island is spread through the year — there is no season you can rely on being dry.
Reunion Island rain arrives in short, heavy bursts — shelter and timing matter more than gear.
Rain falls on about 24 days in January against 3 in August — 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 | 280mm | 24 | 80% | 30°C |
| February | 270mm | 23 | 77% | 30°C |
| March | 230mm | 20 | 67% | 29°C |
| April | 130mm | 11 | 37% | 28°C |
| May | 80mm | 7 | 23% | 27°C |
| June | 55mm | 5 | 17% | 26°C |
| July | 45mm | 4 | 13% | 25°C |
| August | 40mm | 3 | 10% | 25°C |
| September | 50mm | 4 | 13% | 26°C |
| October | 90mm | 8 | 27% | 27°C |
| November | 130mm | 11 | 37% | 28°C |
| December | 250mm | 21 | 70% | 29°C |
Rain probability is the chance that at least 0.2mm falls at your location — not how long it rains. For Reunion Island 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.
Reunion Island records rain on roughly 140 days a year — about a 38% chance on any given day — totalling around 1800mm.
January, with about 280mm over 24 rain days. That is 16% of the entire year's rainfall in a single month.
August is the driest month at 40mm across roughly 3 days. June through September is the dry season with comfortable temperatures and the best visibility for Piton de la Fournaise volcano.
The west coast stays dry 300+ days per year while the east coast is one of the wettest places on Earth. Pack rain gear for the cirques and volcano but leave it at the hotel for beach days.
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.