| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 18.3° | — | 34.2mm | 7.7 | 79 |
| February | 20.4° | 15.4° | 25mm | 7.6 | 85 |
| March | 23.6° | 19° | 69.6mm | 8.9 | 82 |
| April | 28.2° | 18.6° | 71.3mm | 9.8 | 76 |
| May | 30.7° | — | 218mm | 13.2 | 59 |
| June | 32.4° | — | 250.6mm | 15.2 | 48 |
| July | 32.8° | — | 230mm | 17.1 | 47 |
| August | 32.5° | — | 253.9mm | 16.7 | 48 |
| September | 31.7° | — | 138mm | 10.7 | 60 |
| October | 29.1° | — | 67mm | 6.3 | 79 |
| November | 25.4° | — | 33mm | 5.5 | 89 |
| December | 20.7° | — | 20.7mm | 5.4 | 89 |
January in Cao Bằng averages a daily high of 18.3°C. Expect roughly 7.7 wet days totalling 34.2mm. Comfortable conditions for being outdoors all day.
February in Cao Bằng averages a daily high of 20.4°C with nights around 15.4°C. Expect roughly 7.6 wet days totalling 25mm. Comfortable conditions for being outdoors all day.
March in Cao Bằng averages a daily high of 23.6°C with nights around 19°C. Expect roughly 8.9 wet days totalling 69.6mm. Comfortable conditions for being outdoors all day.
April in Cao Bằng averages a daily high of 28.2°C with nights around 18.6°C. Expect roughly 9.8 wet days totalling 71.3mm. Comfortable conditions for being outdoors all day.
May in Cao Bằng averages a daily high of 30.7°C. Expect roughly 13.2 wet days totalling 218mm. Generally workable, with some weather to plan around.
June in Cao Bằng averages a daily high of 32.4°C. Expect roughly 15.2 wet days totalling 250.6mm. Demanding conditions — pack for it and plan indoor options.
July in Cao Bằng averages a daily high of 32.8°C. Expect roughly 17.1 wet days totalling 230mm. Demanding conditions — pack for it and plan indoor options.
August in Cao Bằng averages a daily high of 32.5°C. Expect roughly 16.7 wet days totalling 253.9mm. Demanding conditions — pack for it and plan indoor options.
September in Cao Bằng averages a daily high of 31.7°C. Expect roughly 10.7 wet days totalling 138mm. Generally workable, with some weather to plan around.
October in Cao Bằng averages a daily high of 29.1°C. Expect roughly 6.3 wet days totalling 67mm. Comfortable conditions for being outdoors all day.
November in Cao Bằng averages a daily high of 25.4°C. Expect roughly 5.5 wet days totalling 33mm. Comfortable conditions for being outdoors all day.
December in Cao Bằng averages a daily high of 20.7°C. Expect roughly 5.4 wet days totalling 20.7mm. 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. Cao Bằng peaks at 89.
Based on 30 years of records, February–March scores highest for comfort in Cao Bằng, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 32.8°C.
August is the wettest, averaging 253.9mm of rain across roughly 16.7 wet days.
January is the coolest month, with average daily highs around 18.3°C.