| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 20° | — | 24.9mm | 7.3 | 85 |
| February | 20.8° | 18.4° | 15mm | 8.3 | 83 |
| March | 23.3° | — | 38.2mm | 10.9 | 78 |
| April | 27.5° | — | 55.4mm | 8.8 | 80 |
| May | 31.1° | — | 138.9mm | 10.4 | 63 |
| June | 33.6° | — | 141.3mm | 9.2 | 55 |
| July | 33.1° | — | 209.4mm | 11.3 | 53 |
| August | 31.9° | — | 272.3mm | 13.8 | 53 |
| September | 30.7° | 24.9° | 342.5mm | 13.7 | 58 |
| October | 28.9° | — | 198.6mm | 10.9 | 71 |
| November | 25.9° | — | 73.3mm | 5.9 | 88 |
| December | 22° | — | 26.4mm | 5.3 | 89 |
January in Nghi Sơn averages a daily high of 20°C. Expect roughly 7.3 wet days totalling 24.9mm. Comfortable conditions for being outdoors all day.
February in Nghi Sơn averages a daily high of 20.8°C with nights around 18.4°C. Expect roughly 8.3 wet days totalling 15mm. Comfortable conditions for being outdoors all day.
March in Nghi Sơn averages a daily high of 23.3°C. Expect roughly 10.9 wet days totalling 38.2mm. Comfortable conditions for being outdoors all day.
April in Nghi Sơn averages a daily high of 27.5°C. Expect roughly 8.8 wet days totalling 55.4mm. Comfortable conditions for being outdoors all day.
May in Nghi Sơn averages a daily high of 31.1°C. Expect roughly 10.4 wet days totalling 138.9mm. Generally workable, with some weather to plan around.
June in Nghi Sơn averages a daily high of 33.6°C. Expect roughly 9.2 wet days totalling 141.3mm. Generally workable, with some weather to plan around.
July in Nghi Sơn averages a daily high of 33.1°C. Expect roughly 11.3 wet days totalling 209.4mm. Demanding conditions — pack for it and plan indoor options.
August in Nghi Sơn averages a daily high of 31.9°C. Expect roughly 13.8 wet days totalling 272.3mm. Demanding conditions — pack for it and plan indoor options.
September in Nghi Sơn averages a daily high of 30.7°C with nights around 24.9°C. Expect roughly 13.7 wet days totalling 342.5mm. Generally workable, with some weather to plan around.
October in Nghi Sơn averages a daily high of 28.9°C. Expect roughly 10.9 wet days totalling 198.6mm. Generally workable, with some weather to plan around.
November in Nghi Sơn averages a daily high of 25.9°C. Expect roughly 5.9 wet days totalling 73.3mm. Comfortable conditions for being outdoors all day.
December in Nghi Sơn averages a daily high of 22°C. Expect roughly 5.3 wet days totalling 26.4mm. 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. Nghi Sơn peaks at 89.
Based on 30 years of records, November–February scores highest for comfort in Nghi Sơn, balancing daytime temperature against rainfall.
June is the warmest, averaging a daily high of 33.6°C.
September is the wettest, averaging 342.5mm of rain across roughly 13.7 wet days.
January is the coolest month, with average daily highs around 20°C.