Miami records about 1572mm of rain across roughly 132 wet days a year, which is a 36% chance on an average day. September is the wettest month at 253mm (16% of the annual total) and December the driest at 49mm. Local rain type: thunderstorms. Essential from May through October — afternoon thunderstorms are a daily ritual. They're intense but usually pass within an hour. A waterproof phone case protects against both rain and beach splashes.
Chance of rain on an average day: 36%
Rainfall climatology for Miami. 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 | 1572mm |
| Rain days per year | 132 |
| Odds on an average day | 36% |
| Wettest month | September — 253mm over 21 days |
| Driest month | December — 49mm over 4 days |
| Rain type | thunderstorms |
| Best dry window | December through April is dry season with pleasant temperatures and low humidity. |
| Worst rain window | September brings hurricane season's peak with the heaviest rainfall. |
September delivers 416% more rain than December (253mm vs 49mm). 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 Miami is spread through the year — there is no season you can rely on being dry.
Miami rain arrives in short, heavy bursts — shelter and timing matter more than gear.
Rain falls on about 21 days in September against 4 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 | 51mm | 4 | 13% | 25°C |
| February | 53mm | 4 | 13% | 25°C |
| March | 76mm | 6 | 20% | 26°C |
| April | 78mm | 6 | 20% | 28°C |
| May | 170mm | 14 | 47% | 30°C |
| June | 247mm | 20 | 67% | 32°C |
| July | 165mm | 13 | 43% | 33°C |
| August | 226mm | 18 | 60% | 33°C |
| September | 253mm | 21 | 70% | 32°C |
| October | 170mm | 14 | 47% | 30°C |
| November | 83mm | 7 | 23% | 28°C |
| December | 49mm | 4 | 13% | 26°C |
Rain probability is the chance that at least 0.2mm falls at your location — not how long it rains. For Miami 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.
Miami records rain on roughly 132 days a year — about a 36% chance on any given day — totalling around 1572mm.
September, with about 253mm over 21 rain days. That is 16% of the entire year's rainfall in a single month.
December is the driest month at 49mm across roughly 4 days. December through April is dry season with pleasant temperatures and low humidity.
Essential from May through October — afternoon thunderstorms are a daily ritual. They're intense but usually pass within an hour. A waterproof phone case protects against both rain and beach splashes.
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.