Perth records about 734mm of rain across roughly 84 wet days a year, which is a 23% chance on an average day. June is the wettest month at 148mm (20% of the annual total) and January the driest at 8mm. Local rain type: steady rain. Perth has a distinct Mediterranean climate — dry hot summers and wet cool winters. No umbrella needed from November through March.
Chance of rain on an average day: 23%
Rainfall climatology for Perth. 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 | 734mm |
| Rain days per year | 84 |
| Odds on an average day | 23% |
| Wettest month | June — 148mm over 17 days |
| Driest month | January — 8mm over 1 days |
| Rain type | steady rain |
| Best dry window | November through March offers virtually guaranteed dry, sunny weather. |
| Worst rain window | June and July bring the bulk of Perth's annual rain as persistent winter fronts. |
June delivers 1750% more rain than January (148mm vs 8mm). That gap is the difference between planning around showers and ignoring them.
20% of the year's rain falls in June alone, so Perth has a genuine wet season rather than evenly spread showers.
Perth rain typically comes as discrete showers, so a compact umbrella and a flexible plan are usually enough.
Rain falls on about 17 days in June 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 | 8mm | 1 | 3% | 32°C |
| February | 12mm | 1 | 3% | 32°C |
| March | 17mm | 2 | 7% | 30°C |
| April | 43mm | 5 | 17% | 27°C |
| May | 106mm | 12 | 40% | 23°C |
| June | 148mm | 17 | 57% | 20°C |
| July | 145mm | 16 | 53% | 18°C |
| August | 118mm | 13 | 43% | 18°C |
| September | 73mm | 8 | 27% | 20°C |
| October | 44mm | 5 | 17% | 23°C |
| November | 22mm | 2 | 7% | 27°C |
| December | 10mm | 1 | 3% | 30°C |
Rain probability is the chance that at least 0.2mm falls at your location — not how long it rains. For Perth 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.
Perth records rain on roughly 84 days a year — about a 23% chance on any given day — totalling around 734mm.
June, with about 148mm over 17 rain days. That is 20% of the entire year's rainfall in a single month.
January is the driest month at 8mm across roughly 1 days. November through March offers virtually guaranteed dry, sunny weather.
Perth has a distinct Mediterranean climate — dry hot summers and wet cool winters. No umbrella needed from November through March.
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.