| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 17.6° | 6.6° | 116.2mm | 9.1 | 74 |
| February | 19.4° | 8.7° | 71.2mm | 8.3 | 81 |
| March | 22.9° | 12° | 88.2mm | 7.8 | 84 |
| April | 26° | 15.4° | 92.9mm | 7 | 86 |
| May | 29.8° | 19.9° | 128.7mm | 7.4 | 74 |
| June | 32.6° | 22.9° | 159.3mm | 10.5 | 57 |
| July | 33.5° | 23.7° | 178.7mm | 11.9 | 50 |
| August | 33.9° | 23.8° | 174.6mm | 11.3 | 50 |
| September | 31.8° | 21.6° | 168.7mm | 8.9 | 63 |
| October | 27.7° | 16.2° | 128mm | 7.4 | 82 |
| November | 22.4° | 11.1° | 101.5mm | 7.7 | 85 |
| December | 18.7° | 7.8° | 117.3mm | 9.2 | 77 |
January in Port Arthur averages a daily high of 17.6°C with nights around 6.6°C. Expect roughly 9.1 wet days totalling 116.2mm. Generally workable, with some weather to plan around.
February in Port Arthur averages a daily high of 19.4°C with nights around 8.7°C. Expect roughly 8.3 wet days totalling 71.2mm. Comfortable conditions for being outdoors all day.
March in Port Arthur averages a daily high of 22.9°C with nights around 12°C. Expect roughly 7.8 wet days totalling 88.2mm. Comfortable conditions for being outdoors all day.
April in Port Arthur averages a daily high of 26°C with nights around 15.4°C. Expect roughly 7 wet days totalling 92.9mm. Comfortable conditions for being outdoors all day.
May in Port Arthur averages a daily high of 29.8°C with nights around 19.9°C. Expect roughly 7.4 wet days totalling 128.7mm. Generally workable, with some weather to plan around.
June in Port Arthur averages a daily high of 32.6°C with nights around 22.9°C. Expect roughly 10.5 wet days totalling 159.3mm. Generally workable, with some weather to plan around.
July in Port Arthur averages a daily high of 33.5°C with nights around 23.7°C. Expect roughly 11.9 wet days totalling 178.7mm. Demanding conditions — pack for it and plan indoor options.
August in Port Arthur averages a daily high of 33.9°C with nights around 23.8°C. Expect roughly 11.3 wet days totalling 174.6mm. Demanding conditions — pack for it and plan indoor options.
September in Port Arthur averages a daily high of 31.8°C with nights around 21.6°C. Expect roughly 8.9 wet days totalling 168.7mm. Generally workable, with some weather to plan around.
October in Port Arthur averages a daily high of 27.7°C with nights around 16.2°C. Expect roughly 7.4 wet days totalling 128mm. Comfortable conditions for being outdoors all day.
November in Port Arthur averages a daily high of 22.4°C with nights around 11.1°C. Expect roughly 7.7 wet days totalling 101.5mm. Comfortable conditions for being outdoors all day.
December in Port Arthur averages a daily high of 18.7°C with nights around 7.8°C. Expect roughly 9.2 wet days totalling 117.3mm. 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. Port Arthur peaks at 86.
Based on 30 years of records, February–April scores highest for comfort in Port Arthur, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 33.9°C.
July is the wettest, averaging 178.7mm of rain across roughly 11.9 wet days.
January is the coolest month, with average daily highs around 17.6°C.