| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 29.6° | 19° | 14.5mm | 1.8 | 86 |
| February | 29.9° | 19.4° | 12mm | 1.6 | 85 |
| March | 27.9° | 18.2° | 15.8mm | 3.3 | 90 |
| April | 24.2° | 15.8° | 38.2mm | 6.4 | 87 |
| May | 21.2° | 13.4° | 78.9mm | 9.6 | 81 |
| June | 18.6° | 11.6° | 117.8mm | 13.8 | 68 |
| July | 17.6° | 10.9° | 116.9mm | 16.9 | 62 |
| August | 18.1° | 11.1° | 93mm | 14.4 | 65 |
| September | 19.3° | 11.9° | 58.6mm | 12.3 | 73 |
| October | 21.9° | 13.5° | 31.3mm | 7.4 | 85 |
| November | 25° | 15.6° | 22.6mm | 5 | 90 |
| December | 27.5° | 17.4° | 13.9mm | 2.3 | 93 |
January in Mandurah averages a daily high of 29.6°C with nights around 19°C. Rain is rare — about 1.8 wet days and 14.5mm across the month. Comfortable conditions for being outdoors all day.
February in Mandurah averages a daily high of 29.9°C with nights around 19.4°C. Rain is rare — about 1.6 wet days and 12mm across the month. Comfortable conditions for being outdoors all day.
March in Mandurah averages a daily high of 27.9°C with nights around 18.2°C. Expect roughly 3.3 wet days totalling 15.8mm. Comfortable conditions for being outdoors all day.
April in Mandurah averages a daily high of 24.2°C with nights around 15.8°C. Expect roughly 6.4 wet days totalling 38.2mm. Comfortable conditions for being outdoors all day.
May in Mandurah averages a daily high of 21.2°C with nights around 13.4°C. Expect roughly 9.6 wet days totalling 78.9mm. Comfortable conditions for being outdoors all day.
June in Mandurah averages a daily high of 18.6°C with nights around 11.6°C. Expect roughly 13.8 wet days totalling 117.8mm. Generally workable, with some weather to plan around.
July in Mandurah averages a daily high of 17.6°C with nights around 10.9°C. Expect roughly 16.9 wet days totalling 116.9mm. Generally workable, with some weather to plan around.
August in Mandurah averages a daily high of 18.1°C with nights around 11.1°C. Expect roughly 14.4 wet days totalling 93mm. Generally workable, with some weather to plan around.
September in Mandurah averages a daily high of 19.3°C with nights around 11.9°C. Expect roughly 12.3 wet days totalling 58.6mm. Generally workable, with some weather to plan around.
October in Mandurah averages a daily high of 21.9°C with nights around 13.5°C. Expect roughly 7.4 wet days totalling 31.3mm. Comfortable conditions for being outdoors all day.
November in Mandurah averages a daily high of 25°C with nights around 15.6°C. Expect roughly 5 wet days totalling 22.6mm. Comfortable conditions for being outdoors all day.
December in Mandurah averages a daily high of 27.5°C with nights around 17.4°C. Rain is rare — about 2.3 wet days and 13.9mm 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. Mandurah peaks at 93.
Based on 30 years of records, October–April scores highest for comfort in Mandurah, balancing daytime temperature against rainfall.
February is the warmest, averaging a daily high of 29.9°C.
June is the wettest, averaging 117.8mm of rain across roughly 13.8 wet days.
July is the coolest month, with average daily highs around 17.6°C.