| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 21.9° | 13.7° | 72mm | 9.8 | 80 |
| February | 22.6° | 13.9° | 91.7mm | 9.7 | 81 |
| March | 21.4° | 12.5° | 94.3mm | 10.9 | 78 |
| April | 19.1° | 10.8° | 121.3mm | 13.7 | 70 |
| May | 16.6° | 9.4° | 141.3mm | 18.2 | 59 |
| June | 14.6° | 7.5° | 137mm | 17.3 | 53 |
| July | 13.7° | 6.4° | 133.5mm | 19 | 50 |
| August | 14.1° | 6.5° | 135.5mm | 17.9 | 51 |
| September | 15.2° | 8.4° | 118.8mm | 17.7 | 55 |
| October | 16.3° | 9.3° | 118.9mm | 16.7 | 58 |
| November | 18° | 10.7° | 101.1mm | 13.5 | 67 |
| December | 20.1° | 13° | 115.6mm | 14.3 | 71 |
January in New Plymouth averages a daily high of 21.9°C with nights around 13.7°C. Expect roughly 9.8 wet days totalling 72mm. Comfortable conditions for being outdoors all day.
February in New Plymouth averages a daily high of 22.6°C with nights around 13.9°C. Expect roughly 9.7 wet days totalling 91.7mm. Comfortable conditions for being outdoors all day.
March in New Plymouth averages a daily high of 21.4°C with nights around 12.5°C. Expect roughly 10.9 wet days totalling 94.3mm. Comfortable conditions for being outdoors all day.
April in New Plymouth averages a daily high of 19.1°C with nights around 10.8°C. Expect roughly 13.7 wet days totalling 121.3mm. Generally workable, with some weather to plan around.
May in New Plymouth averages a daily high of 16.6°C with nights around 9.4°C. Expect roughly 18.2 wet days totalling 141.3mm. Generally workable, with some weather to plan around.
June in New Plymouth averages a daily high of 14.6°C with nights around 7.5°C. Expect roughly 17.3 wet days totalling 137mm. Demanding conditions — pack for it and plan indoor options.
July in New Plymouth averages a daily high of 13.7°C with nights around 6.4°C. Expect roughly 19 wet days totalling 133.5mm. Demanding conditions — pack for it and plan indoor options.
August in New Plymouth averages a daily high of 14.1°C with nights around 6.5°C. Expect roughly 17.9 wet days totalling 135.5mm. Demanding conditions — pack for it and plan indoor options.
September in New Plymouth averages a daily high of 15.2°C with nights around 8.4°C. Expect roughly 17.7 wet days totalling 118.8mm. Generally workable, with some weather to plan around.
October in New Plymouth averages a daily high of 16.3°C with nights around 9.3°C. Expect roughly 16.7 wet days totalling 118.9mm. Generally workable, with some weather to plan around.
November in New Plymouth averages a daily high of 18°C with nights around 10.7°C. Expect roughly 13.5 wet days totalling 101.1mm. Generally workable, with some weather to plan around.
December in New Plymouth averages a daily high of 20.1°C with nights around 13°C. Expect roughly 14.3 wet days totalling 115.6mm. Generally workable, with some weather to plan around.
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. New Plymouth peaks at 81.
Based on 30 years of records, January–March scores highest for comfort in New Plymouth, balancing daytime temperature against rainfall.
February is the warmest, averaging a daily high of 22.6°C.
May is the wettest, averaging 141.3mm of rain across roughly 18.2 wet days.
July is the coolest month, with average daily highs around 13.7°C.