Key West records about 1002mm of rain across roughly 82 wet days a year, which is a 22% chance on an average day. September is the wettest month at 158mm (16% of the annual total) and February the driest at 38mm. Local rain type: thunderstorms. Key West gets intense summer storms — the island is surrounded by warm water that fuels thunderstorms and hurricanes. Hurricane season is June-November.
Chance of rain on an average day: 22%
Rainfall climatology for Key West. 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 | 1002mm |
| Rain days per year | 82 |
| Odds on an average day | 22% |
| Wettest month | September — 158mm over 13 days |
| Driest month | February — 38mm over 3 days |
| Rain type | thunderstorms |
| Best dry window | December through April offers dry, comfortable tropical weather. |
| Worst rain window | August through October brings peak hurricane season and the most rainfall. |
September delivers 316% more rain than February (158mm vs 38mm). 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 Key West is spread through the year — there is no season you can rely on being dry.
Key West rain arrives in short, heavy bursts — shelter and timing matter more than gear.
Rain falls on about 13 days in September against 3 in February — 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 | 45mm | 4 | 13% | 24°C |
| February | 38mm | 3 | 10% | 24°C |
| March | 38mm | 3 | 10% | 25°C |
| April | 45mm | 4 | 13% | 27°C |
| May | 82mm | 7 | 23% | 30°C |
| June | 128mm | 11 | 37% | 32°C |
| July | 98mm | 8 | 27% | 33°C |
| August | 132mm | 11 | 37% | 33°C |
| September | 158mm | 13 | 43% | 32°C |
| October | 135mm | 11 | 37% | 30°C |
| November | 58mm | 5 | 17% | 27°C |
| December | 42mm | 3 | 10% | 25°C |
Rain probability is the chance that at least 0.2mm falls at your location — not how long it rains. For Key West 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.
Key West records rain on roughly 82 days a year — about a 22% chance on any given day — totalling around 1002mm.
September, with about 158mm over 13 rain days. That is 16% of the entire year's rainfall in a single month.
February is the driest month at 38mm across roughly 3 days. December through April offers dry, comfortable tropical weather.
Key West gets intense summer storms — the island is surrounded by warm water that fuels thunderstorms and hurricanes. Hurricane season is June-November.
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.