| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 21.2° | 8.6° | 10.3mm | 2.4 | 95 |
| February | 23° | 9.8° | 8.3mm | 2.1 | 96 |
| March | 27.1° | 12.6° | 8.3mm | 1.5 | 97 |
| April | 30.5° | 15.3° | 2.2mm | 0.8 | 84 |
| May | 34.7° | 19.2° | 0.7mm | 0.3 | 69 |
| June | 39.8° | 23.8° | 0.3mm | 0.1 | 49 |
| July | 41.9° | 28.4° | 5.9mm | 1.2 | 38 |
| August | 41.7° | 28.6° | 5.3mm | 1.6 | 38 |
| September | 38.7° | 25.3° | 15.7mm | 1.3 | 51 |
| October | 32.6° | 18.6° | 3mm | 1 | 76 |
| November | 25.9° | 12.6° | 5.6mm | 0.9 | 98 |
| December | 20.5° | 8.2° | 8.4mm | 1.9 | 96 |
January in San Luis Río Colorado averages a daily high of 21.2°C with nights around 8.6°C. Rain is rare — about 2.4 wet days and 10.3mm across the month. Comfortable conditions for being outdoors all day.
February in San Luis Río Colorado averages a daily high of 23°C with nights around 9.8°C. Rain is rare — about 2.1 wet days and 8.3mm across the month. Comfortable conditions for being outdoors all day.
March in San Luis Río Colorado averages a daily high of 27.1°C with nights around 12.6°C. Rain is rare — about 1.5 wet days and 8.3mm across the month. Comfortable conditions for being outdoors all day.
April in San Luis Río Colorado averages a daily high of 30.5°C with nights around 15.3°C. Rain is rare — about 0.8 wet days and 2.2mm across the month. Comfortable conditions for being outdoors all day.
May in San Luis Río Colorado averages a daily high of 34.7°C with nights around 19.2°C. Rain is rare — about 0.3 wet days and 0.7mm across the month. Generally workable, with some weather to plan around.
June in San Luis Río Colorado averages a daily high of 39.8°C with nights around 23.8°C. Rain is rare — about 0.1 wet days and 0.3mm across the month. Demanding conditions — pack for it and plan indoor options.
July in San Luis Río Colorado averages a daily high of 41.9°C with nights around 28.4°C. Rain is rare — about 1.2 wet days and 5.9mm across the month. Demanding conditions — pack for it and plan indoor options.
August in San Luis Río Colorado averages a daily high of 41.7°C with nights around 28.6°C. Rain is rare — about 1.6 wet days and 5.3mm across the month. Demanding conditions — pack for it and plan indoor options.
September in San Luis Río Colorado averages a daily high of 38.7°C with nights around 25.3°C. Rain is rare — about 1.3 wet days and 15.7mm across the month. Demanding conditions — pack for it and plan indoor options.
October in San Luis Río Colorado averages a daily high of 32.6°C with nights around 18.6°C. Rain is rare — about 1 wet days and 3mm across the month. Comfortable conditions for being outdoors all day.
November in San Luis Río Colorado averages a daily high of 25.9°C with nights around 12.6°C. Rain is rare — about 0.9 wet days and 5.6mm across the month. Comfortable conditions for being outdoors all day.
December in San Luis Río Colorado averages a daily high of 20.5°C with nights around 8.2°C. Rain is rare — about 1.9 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. San Luis Río Colorado peaks at 98.
Based on 30 years of records, November–March scores highest for comfort in San Luis Río Colorado, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 41.9°C.
September is the wettest, averaging 15.7mm of rain across roughly 1.3 wet days.
December is the coolest month, with average daily highs around 20.5°C.