| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 20.7° | 6.3° | 12.2mm | 2.8 | 94 |
| February | 23.2° | 8.2° | 9.7mm | 2.9 | 94 |
| March | 26.9° | 12.4° | 23.1mm | 3.4 | 93 |
| April | 31.6° | 16.2° | 23.9mm | 2.8 | 76 |
| May | 35.4° | 21.1° | 57.5mm | 4.1 | 58 |
| June | 38.1° | 23.7° | 46.9mm | 3.1 | 49 |
| July | 38.8° | 24.2° | 34.3mm | 3.7 | 45 |
| August | 39° | 24.6° | 41.6mm | 2.9 | 46 |
| September | 36.1° | 22.3° | 61.2mm | 4 | 56 |
| October | 30.3° | 16.8° | 31.3mm | 3.1 | 81 |
| November | 24.4° | 11.1° | 18.7mm | 3.2 | 94 |
| December | 20.3° | 5.7° | 8.4mm | 2.7 | 95 |
January in Piedras Negras averages a daily high of 20.7°C with nights around 6.3°C. Rain is rare — about 2.8 wet days and 12.2mm across the month. Comfortable conditions for being outdoors all day.
February in Piedras Negras averages a daily high of 23.2°C with nights around 8.2°C. Rain is rare — about 2.9 wet days and 9.7mm across the month. Comfortable conditions for being outdoors all day.
March in Piedras Negras averages a daily high of 26.9°C with nights around 12.4°C. Expect roughly 3.4 wet days totalling 23.1mm. Comfortable conditions for being outdoors all day.
April in Piedras Negras averages a daily high of 31.6°C with nights around 16.2°C. Rain is rare — about 2.8 wet days and 23.9mm across the month. Comfortable conditions for being outdoors all day.
May in Piedras Negras averages a daily high of 35.4°C with nights around 21.1°C. Expect roughly 4.1 wet days totalling 57.5mm. Generally workable, with some weather to plan around.
June in Piedras Negras averages a daily high of 38.1°C with nights around 23.7°C. Expect roughly 3.1 wet days totalling 46.9mm. Demanding conditions — pack for it and plan indoor options.
July in Piedras Negras averages a daily high of 38.8°C with nights around 24.2°C. Expect roughly 3.7 wet days totalling 34.3mm. Demanding conditions — pack for it and plan indoor options.
August in Piedras Negras averages a daily high of 39°C with nights around 24.6°C. Rain is rare — about 2.9 wet days and 41.6mm across the month. Demanding conditions — pack for it and plan indoor options.
September in Piedras Negras averages a daily high of 36.1°C with nights around 22.3°C. Expect roughly 4 wet days totalling 61.2mm. Generally workable, with some weather to plan around.
October in Piedras Negras averages a daily high of 30.3°C with nights around 16.8°C. Expect roughly 3.1 wet days totalling 31.3mm. Comfortable conditions for being outdoors all day.
November in Piedras Negras averages a daily high of 24.4°C with nights around 11.1°C. Expect roughly 3.2 wet days totalling 18.7mm. Comfortable conditions for being outdoors all day.
December in Piedras Negras averages a daily high of 20.3°C with nights around 5.7°C. Rain is rare — about 2.7 wet days and 8.4mm 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. Piedras Negras peaks at 95.
Based on 30 years of records, November–March scores highest for comfort in Piedras Negras, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 39°C.
September is the wettest, averaging 61.2mm of rain across roughly 4 wet days.
December is the coolest month, with average daily highs around 20.3°C.