Antigua Guatemala records about 1000mm of rain across roughly 105 wet days a year, which is a 29% chance on an average day. September is the wettest month at 200mm (20% of the annual total) and January the driest at 5mm. Local rain type: thunderstorms. Antigua's dry season (November-April) is virtually rainless — perfect for exploring colonial streets and volcano views. Rainy season brings dramatic afternoon thunderstorms that clear by dinner.
Chance of rain on an average day: 29%
Rainfall climatology for Antigua Guatemala. 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 | 1000mm |
| Rain days per year | 105 |
| Odds on an average day | 29% |
| Wettest month | September — 200mm over 21 days |
| Driest month | January — 5mm over 1 days |
| Rain type | thunderstorms |
| Best dry window | December through March is bone-dry with crystal-clear views of all three surrounding volcanoes. |
| Worst rain window | September brings the heaviest rain and occasional volcanic mudflows (lahars) on Volcán de Fuego's slopes. |
September delivers 3900% more rain than January (200mm vs 5mm). That gap is the difference between planning around showers and ignoring them.
20% of the year's rain falls in September alone, so Antigua Guatemala has a genuine wet season rather than evenly spread showers.
Antigua Guatemala rain arrives in short, heavy bursts — shelter and timing matter more than gear.
Rain falls on about 21 days in September 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 | 5mm | 1 | 3% | 23°C |
| February | 5mm | 1 | 3% | 23°C |
| March | 10mm | 1 | 3% | 23°C |
| April | 35mm | 4 | 13% | 24°C |
| May | 120mm | 12 | 40% | 24°C |
| June | 180mm | 19 | 63% | 25°C |
| July | 160mm | 16 | 53% | 25°C |
| August | 150mm | 15 | 50% | 25°C |
| September | 200mm | 21 | 70% | 25°C |
| October | 120mm | 12 | 40% | 24°C |
| November | 25mm | 3 | 10% | 24°C |
| December | 10mm | 1 | 3% | 23°C |
Rain probability is the chance that at least 0.2mm falls at your location — not how long it rains. For Antigua Guatemala 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.
Antigua Guatemala records rain on roughly 105 days a year — about a 29% chance on any given day — totalling around 1000mm.
September, with about 200mm over 21 rain days. That is 20% of the entire year's rainfall in a single month.
January is the driest month at 5mm across roughly 1 days. December through March is bone-dry with crystal-clear views of all three surrounding volcanoes.
Antigua's dry season (November-April) is virtually rainless — perfect for exploring colonial streets and volcano views. Rainy season brings dramatic afternoon thunderstorms that clear by dinner.
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.