| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 31.5° | 18.2° | 17.2mm | 2.1 | 78 |
| February | 31.8° | 18.4° | 13.1mm | 1.9 | 77 |
| March | 29.6° | 16.9° | 21.1mm | 3.7 | 82 |
| April | 25.9° | 13.8° | 37.7mm | 5.8 | 88 |
| May | 22.4° | 10.5° | 84.5mm | 10.1 | 80 |
| June | 19.5° | 8.7° | 126.6mm | 13.4 | 72 |
| July | 18.5° | 8.1° | 147.1mm | 16.2 | 65 |
| August | 19.1° | 8.5° | 120.1mm | 14.7 | 68 |
| September | 20.6° | 9.7° | 79.2mm | 12.4 | 75 |
| October | 23.5° | 11.7° | 39.7mm | 7.2 | 86 |
| November | 26.7° | 14.4° | 25.4mm | 4.8 | 90 |
| December | 29.6° | 16.6° | 9.9mm | 2.7 | 84 |
January in Perth averages a daily high of 31.5°C with nights around 18.2°C. Rain is rare — about 2.1 wet days and 17.2mm across the month. Comfortable conditions for being outdoors all day.
February in Perth averages a daily high of 31.8°C with nights around 18.4°C. Rain is rare — about 1.9 wet days and 13.1mm across the month. Comfortable conditions for being outdoors all day.
March in Perth averages a daily high of 29.6°C with nights around 16.9°C. Expect roughly 3.7 wet days totalling 21.1mm. Comfortable conditions for being outdoors all day.
April in Perth averages a daily high of 25.9°C with nights around 13.8°C. Expect roughly 5.8 wet days totalling 37.7mm. Comfortable conditions for being outdoors all day.
May in Perth averages a daily high of 22.4°C with nights around 10.5°C. Expect roughly 10.1 wet days totalling 84.5mm. Comfortable conditions for being outdoors all day.
June in Perth averages a daily high of 19.5°C with nights around 8.7°C. Expect roughly 13.4 wet days totalling 126.6mm. Generally workable, with some weather to plan around.
July in Perth averages a daily high of 18.5°C with nights around 8.1°C. Expect roughly 16.2 wet days totalling 147.1mm. Generally workable, with some weather to plan around.
August in Perth averages a daily high of 19.1°C with nights around 8.5°C. Expect roughly 14.7 wet days totalling 120.1mm. Generally workable, with some weather to plan around.
September in Perth averages a daily high of 20.6°C with nights around 9.7°C. Expect roughly 12.4 wet days totalling 79.2mm. Comfortable conditions for being outdoors all day.
October in Perth averages a daily high of 23.5°C with nights around 11.7°C. Expect roughly 7.2 wet days totalling 39.7mm. Comfortable conditions for being outdoors all day.
November in Perth averages a daily high of 26.7°C with nights around 14.4°C. Expect roughly 4.8 wet days totalling 25.4mm. Comfortable conditions for being outdoors all day.
December in Perth averages a daily high of 29.6°C with nights around 16.6°C. Rain is rare — about 2.7 wet days and 9.9mm across the month. Comfortable conditions for being outdoors all day.
Each month scores out of 100. It starts at 100 and loses points for daytime highs outside a 20–27°C band, for wet days, and for nights below 2°C. Nothing else is weighted in — no crowd data, no prices, no opinion. Perth peaks at 90.
Based on 30 years of records, October–December scores highest for comfort in Perth, balancing daytime temperature against rainfall.
February is the warmest, averaging a daily high of 31.8°C.
July is the wettest, averaging 147.1mm of rain across roughly 16.2 wet days.
July is the coolest month, with average daily highs around 18.5°C.