Lombok records about 1500mm of rain across roughly 115 wet days a year, which is a 32% chance on an average day. January is the wettest month at 250mm (17% of the annual total) and August the driest at 15mm. Local rain type: thunderstorms. Lombok's dry season (May-September) is reliably rain-free. Wet season brings dramatic afternoon thunderstorms that clear by evening — mornings are usually sunny.
Chance of rain on an average day: 32%
Rainfall climatology for Lombok. 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 | 1500mm |
| Rain days per year | 115 |
| Odds on an average day | 32% |
| Wettest month | January — 250mm over 21 days |
| Driest month | August — 15mm over 1 days |
| Rain type | thunderstorms |
| Best dry window | July and August are the driest months — perfect for Rinjani trekking and diving at the Gili Islands. |
| Worst rain window | January and February bring the heaviest rain with occasional flooding on unpaved roads in the south. |
January delivers 1567% more rain than August (250mm vs 15mm). That gap is the difference between planning around showers and ignoring them.
No single month holds more than 17% of the annual total, so rain in Lombok is spread through the year — there is no season you can rely on being dry.
Lombok rain arrives in short, heavy bursts — shelter and timing matter more than gear.
Rain falls on about 21 days in January against 1 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 | 250mm | 21 | 70% | 33°C |
| February | 230mm | 19 | 63% | 33°C |
| March | 200mm | 17 | 57% | 33°C |
| April | 100mm | 8 | 27% | 32°C |
| May | 50mm | 4 | 13% | 31°C |
| June | 30mm | 3 | 10% | 30°C |
| July | 20mm | 2 | 7% | 30°C |
| August | 15mm | 1 | 3% | 30°C |
| September | 25mm | 2 | 7% | 30°C |
| October | 70mm | 6 | 20% | 31°C |
| November | 150mm | 13 | 43% | 32°C |
| December | 220mm | 19 | 63% | 33°C |
Rain probability is the chance that at least 0.2mm falls at your location — not how long it rains. For Lombok 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.
Lombok records rain on roughly 115 days a year — about a 32% chance on any given day — totalling around 1500mm.
January, with about 250mm over 21 rain days. That is 17% of the entire year's rainfall in a single month.
August is the driest month at 15mm across roughly 1 days. July and August are the driest months — perfect for Rinjani trekking and diving at the Gili Islands.
Lombok's dry season (May-September) is reliably rain-free. Wet season brings dramatic afternoon thunderstorms that clear by evening — mornings are usually sunny.
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.