| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 22.3° | 10° | 14.9mm | 2.8 | 94 |
| February | 24.3° | 11.7° | 17.8mm | 2.6 | 95 |
| March | 27.3° | 15.4° | 25.6mm | 2.9 | 93 |
| April | 30.5° | 19° | 39.5mm | 3.5 | 79 |
| May | 33.3° | 22.6° | 42.7mm | 2.8 | 69 |
| June | 35.8° | 24.6° | 55.9mm | 3.3 | 58 |
| July | 36.2° | 25.1° | 54.7mm | 3.2 | 57 |
| August | 36.9° | 25.4° | 40.4mm | 3.4 | 54 |
| September | 34.4° | 23.4° | 96.4mm | 5.7 | 59 |
| October | 31.5° | 19.4° | 45.4mm | 3.6 | 75 |
| November | 26.5° | 14.5° | 31.2mm | 3.1 | 94 |
| December | 22.8° | 11° | 18mm | 2.6 | 95 |
January in McAllen averages a daily high of 22.3°C with nights around 10°C. Rain is rare — about 2.8 wet days and 14.9mm across the month. Comfortable conditions for being outdoors all day.
February in McAllen averages a daily high of 24.3°C with nights around 11.7°C. Rain is rare — about 2.6 wet days and 17.8mm across the month. Comfortable conditions for being outdoors all day.
March in McAllen averages a daily high of 27.3°C with nights around 15.4°C. Rain is rare — about 2.9 wet days and 25.6mm across the month. Comfortable conditions for being outdoors all day.
April in McAllen averages a daily high of 30.5°C with nights around 19°C. Expect roughly 3.5 wet days totalling 39.5mm. Comfortable conditions for being outdoors all day.
May in McAllen averages a daily high of 33.3°C with nights around 22.6°C. Rain is rare — about 2.8 wet days and 42.7mm across the month. Generally workable, with some weather to plan around.
June in McAllen averages a daily high of 35.8°C with nights around 24.6°C. Expect roughly 3.3 wet days totalling 55.9mm. Generally workable, with some weather to plan around.
July in McAllen averages a daily high of 36.2°C with nights around 25.1°C. Expect roughly 3.2 wet days totalling 54.7mm. Generally workable, with some weather to plan around.
August in McAllen averages a daily high of 36.9°C with nights around 25.4°C. Expect roughly 3.4 wet days totalling 40.4mm. Demanding conditions — pack for it and plan indoor options.
September in McAllen averages a daily high of 34.4°C with nights around 23.4°C. Expect roughly 5.7 wet days totalling 96.4mm. Generally workable, with some weather to plan around.
October in McAllen averages a daily high of 31.5°C with nights around 19.4°C. Expect roughly 3.6 wet days totalling 45.4mm. Comfortable conditions for being outdoors all day.
November in McAllen averages a daily high of 26.5°C with nights around 14.5°C. Expect roughly 3.1 wet days totalling 31.2mm. Comfortable conditions for being outdoors all day.
December in McAllen averages a daily high of 22.8°C with nights around 11°C. Rain is rare — about 2.6 wet days and 18mm across the month. 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. McAllen peaks at 95.
Based on 30 years of records, November–March scores highest for comfort in McAllen, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 36.9°C.
September is the wettest, averaging 96.4mm of rain across roughly 5.7 wet days.
January is the coolest month, with average daily highs around 22.3°C.