| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 10.8° | 0.2° | 90.7mm | 7.3 | 53 |
| February | 12.9° | 1.5° | 85.8mm | 7.1 | 62 |
| March | 17° | 4.7° | 100mm | 7.3 | 76 |
| April | 22.4° | 9.6° | 90.6mm | 6.7 | 87 |
| May | 26.7° | 14.5° | 97.4mm | 7.3 | 85 |
| June | 30.6° | 19.1° | 112.1mm | 7.7 | 70 |
| July | 32.3° | 21.4° | 121.2mm | 8.2 | 62 |
| August | 31.5° | 20.8° | 123.9mm | 7.8 | 66 |
| September | 27.9° | 17.4° | 163.5mm | 7.3 | 82 |
| October | 22.5° | 10.9° | 98.1mm | 5 | 90 |
| November | 16.6° | 5.1° | 92.1mm | 5.7 | 78 |
| December | 12.7° | 2° | 101.3mm | 7.3 | 62 |
January in Cary averages a daily high of 10.8°C with nights around 0.2°C. Expect roughly 7.3 wet days totalling 90.7mm. Demanding conditions — pack for it and plan indoor options.
February in Cary averages a daily high of 12.9°C with nights around 1.5°C. Expect roughly 7.1 wet days totalling 85.8mm. Generally workable, with some weather to plan around.
March in Cary averages a daily high of 17°C with nights around 4.7°C. Expect roughly 7.3 wet days totalling 100mm. Comfortable conditions for being outdoors all day.
April in Cary averages a daily high of 22.4°C with nights around 9.6°C. Expect roughly 6.7 wet days totalling 90.6mm. Comfortable conditions for being outdoors all day.
May in Cary averages a daily high of 26.7°C with nights around 14.5°C. Expect roughly 7.3 wet days totalling 97.4mm. Comfortable conditions for being outdoors all day.
June in Cary averages a daily high of 30.6°C with nights around 19.1°C. Expect roughly 7.7 wet days totalling 112.1mm. Generally workable, with some weather to plan around.
July in Cary averages a daily high of 32.3°C with nights around 21.4°C. Expect roughly 8.2 wet days totalling 121.2mm. Generally workable, with some weather to plan around.
August in Cary averages a daily high of 31.5°C with nights around 20.8°C. Expect roughly 7.8 wet days totalling 123.9mm. Generally workable, with some weather to plan around.
September in Cary averages a daily high of 27.9°C with nights around 17.4°C. Expect roughly 7.3 wet days totalling 163.5mm. Comfortable conditions for being outdoors all day.
October in Cary averages a daily high of 22.5°C with nights around 10.9°C. Expect roughly 5 wet days totalling 98.1mm. Comfortable conditions for being outdoors all day.
November in Cary averages a daily high of 16.6°C with nights around 5.1°C. Expect roughly 5.7 wet days totalling 92.1mm. Comfortable conditions for being outdoors all day.
December in Cary averages a daily high of 12.7°C with nights around 2°C. Expect roughly 7.3 wet days totalling 101.3mm. 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. Cary peaks at 90.
Based on 30 years of records, April–May scores highest for comfort in Cary, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 32.3°C.
September is the wettest, averaging 163.5mm of rain across roughly 7.3 wet days.
January is the coolest month, with average daily highs around 10.8°C.