| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 13.5° | — | 68.4mm | 6.4 | 66 |
| February | 14.7° | — | 149.9mm | 10.3 | 62 |
| March | 17.6° | — | 188.6mm | 11.3 | 70 |
| April | 21.4° | — | 248.5mm | 11.8 | 76 |
| May | 24.7° | — | 276.7mm | 11.6 | 77 |
| June | 26.8° | — | 626.5mm | 18.2 | 70 |
| July | 30.9° | — | 326.6mm | 13.8 | 57 |
| August | 31.7° | — | 229.8mm | 13.8 | 54 |
| September | 29.1° | — | 366.4mm | 14.9 | 62 |
| October | 25.1° | — | 223.6mm | 9.7 | 81 |
| November | 20.5° | — | 153.6mm | 9.6 | 81 |
| December | 15.5° | — | 87mm | 6.4 | 73 |
January in Nichinan averages a daily high of 13.5°C. Expect roughly 6.4 wet days totalling 68.4mm. Generally workable, with some weather to plan around.
February in Nichinan averages a daily high of 14.7°C. Expect roughly 10.3 wet days totalling 149.9mm. Generally workable, with some weather to plan around.
March in Nichinan averages a daily high of 17.6°C. Expect roughly 11.3 wet days totalling 188.6mm. Generally workable, with some weather to plan around.
April in Nichinan averages a daily high of 21.4°C. Expect roughly 11.8 wet days totalling 248.5mm. Comfortable conditions for being outdoors all day.
May in Nichinan averages a daily high of 24.7°C. Expect roughly 11.6 wet days totalling 276.7mm. Comfortable conditions for being outdoors all day.
June in Nichinan averages a daily high of 26.8°C. Expect roughly 18.2 wet days totalling 626.5mm. Generally workable, with some weather to plan around.
July in Nichinan averages a daily high of 30.9°C. Expect roughly 13.8 wet days totalling 326.6mm. Generally workable, with some weather to plan around.
August in Nichinan averages a daily high of 31.7°C. Expect roughly 13.8 wet days totalling 229.8mm. Demanding conditions — pack for it and plan indoor options.
September in Nichinan averages a daily high of 29.1°C. Expect roughly 14.9 wet days totalling 366.4mm. Generally workable, with some weather to plan around.
October in Nichinan averages a daily high of 25.1°C. Expect roughly 9.7 wet days totalling 223.6mm. Comfortable conditions for being outdoors all day.
November in Nichinan averages a daily high of 20.5°C. Expect roughly 9.6 wet days totalling 153.6mm. Comfortable conditions for being outdoors all day.
December in Nichinan averages a daily high of 15.5°C. Expect roughly 6.4 wet days totalling 87mm. 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. Nichinan peaks at 81.
Based on 30 years of records, October–December scores highest for comfort in Nichinan, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 31.7°C.
June is the wettest, averaging 626.5mm of rain across roughly 18.2 wet days.
January is the coolest month, with average daily highs around 13.5°C.