| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 19° | 8.7° | 18.5mm | 4 | 89 |
| February | 21.7° | 10.9° | 16.2mm | 3.2 | 94 |
| March | 25.3° | 14.2° | 24.4mm | 5.2 | 90 |
| April | 27.8° | 17° | 53.4mm | 8.4 | 80 |
| May | 28.4° | 19.1° | 88.4mm | 11.8 | 71 |
| June | 28.4° | 20.6° | 114.2mm | 14.3 | 66 |
| July | 28.3° | 20.5° | 171.6mm | 17.5 | 65 |
| August | 28.1° | 20° | 143.6mm | 17.1 | 66 |
| September | 27.2° | 18.6° | 79mm | 11.7 | 76 |
| October | 24.8° | 16.5° | 49.3mm | 7.3 | 85 |
| November | 22.3° | 12.4° | 33.8mm | 4.8 | 90 |
| December | 19° | 9.4° | 12.1mm | 3.3 | 90 |
January in Kaiyuan averages a daily high of 19°C with nights around 8.7°C. Expect roughly 4 wet days totalling 18.5mm. Comfortable conditions for being outdoors all day.
February in Kaiyuan averages a daily high of 21.7°C with nights around 10.9°C. Expect roughly 3.2 wet days totalling 16.2mm. Comfortable conditions for being outdoors all day.
March in Kaiyuan averages a daily high of 25.3°C with nights around 14.2°C. Expect roughly 5.2 wet days totalling 24.4mm. Comfortable conditions for being outdoors all day.
April in Kaiyuan averages a daily high of 27.8°C with nights around 17°C. Expect roughly 8.4 wet days totalling 53.4mm. Comfortable conditions for being outdoors all day.
May in Kaiyuan averages a daily high of 28.4°C with nights around 19.1°C. Expect roughly 11.8 wet days totalling 88.4mm. Generally workable, with some weather to plan around.
June in Kaiyuan averages a daily high of 28.4°C with nights around 20.6°C. Expect roughly 14.3 wet days totalling 114.2mm. Generally workable, with some weather to plan around.
July in Kaiyuan averages a daily high of 28.3°C with nights around 20.5°C. Expect roughly 17.5 wet days totalling 171.6mm. Generally workable, with some weather to plan around.
August in Kaiyuan averages a daily high of 28.1°C with nights around 20°C. Expect roughly 17.1 wet days totalling 143.6mm. Generally workable, with some weather to plan around.
September in Kaiyuan averages a daily high of 27.2°C with nights around 18.6°C. Expect roughly 11.7 wet days totalling 79mm. Comfortable conditions for being outdoors all day.
October in Kaiyuan averages a daily high of 24.8°C with nights around 16.5°C. Expect roughly 7.3 wet days totalling 49.3mm. Comfortable conditions for being outdoors all day.
November in Kaiyuan averages a daily high of 22.3°C with nights around 12.4°C. Expect roughly 4.8 wet days totalling 33.8mm. Comfortable conditions for being outdoors all day.
December in Kaiyuan averages a daily high of 19°C with nights around 9.4°C. Expect roughly 3.3 wet days totalling 12.1mm. 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. Kaiyuan peaks at 94.
Based on 30 years of records, November–March scores highest for comfort in Kaiyuan, balancing daytime temperature against rainfall.
May is the warmest, averaging a daily high of 28.4°C.
July is the wettest, averaging 171.6mm of rain across roughly 17.5 wet days.
January is the coolest month, with average daily highs around 19°C.