Santiago records about 312mm of rain across roughly 44 wet days a year, which is a 12% chance on an average day. July is the wettest month at 69mm (22% of the annual total) and January the driest at 1mm. Local rain type: steady rain. Santiago has a Mediterranean climate — dry summers and wet winters. From October through March, rain is essentially nonexistent.
Chance of rain on an average day: 12%
Rainfall climatology for Santiago. 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 | 312mm |
| Rain days per year | 44 |
| Odds on an average day | 12% |
| Wettest month | July — 69mm over 11 days |
| Driest month | January — 1mm over 1 days |
| Rain type | steady rain |
| Best dry window | October through March offers dry, warm to hot conditions — no rain gear needed. |
| Worst rain window | June and July bring cool, grey winter weather with the year's only significant rainfall. |
July delivers 6800% more rain than January (69mm vs 1mm). That gap is the difference between planning around showers and ignoring them.
22% of the year's rain falls in July alone, so Santiago has a genuine wet season rather than evenly spread showers.
Santiago rain typically comes as discrete showers, so a compact umbrella and a flexible plan are usually enough.
Rain falls on about 11 days in July against 1 in January — 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 | 1mm | 1 | 3% | 30°C |
| February | 1mm | 1 | 3% | 30°C |
| March | 3mm | 1 | 3% | 28°C |
| April | 10mm | 2 | 7% | 24°C |
| May | 42mm | 6 | 20% | 20°C |
| June | 66mm | 10 | 33% | 16°C |
| July | 69mm | 11 | 37% | 14°C |
| August | 47mm | 7 | 23% | 14°C |
| September | 22mm | 3 | 10% | 16°C |
| October | 13mm | 2 | 7% | 20°C |
| November | 8mm | 1 | 3% | 24°C |
| December | 5mm | 1 | 3% | 28°C |
Rain probability is the chance that at least 0.2mm falls at your location — not how long it rains. For Santiago 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.
Santiago records rain on roughly 44 days a year — about a 12% chance on any given day — totalling around 312mm.
July, with about 69mm over 11 rain days. That is 22% of the entire year's rainfall in a single month.
January is the driest month at 1mm across roughly 1 days. October through March offers dry, warm to hot conditions — no rain gear needed.
Santiago has a Mediterranean climate — dry summers and wet winters. From October through March, rain is essentially nonexistent.
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.