The consistent thing about the weather in San Miguel de Allende is, as in most places, it’s cooler at night than in the day. However, the temperature change from day to night is much more extreme than in other places I’ve lived or visited. It’s typical to change 30 Fahrenheit from night until daytime here.
January and February can be cold at night in San Miguel de Allende. The typical nighttime temperature in January and February is anywhere from 35 Fahrenheit to 42 Fahrenheit. We have frost maybe twice a winter- once in December and once in January. That’s sad because it immediately kills the beautiful flowers, but the flowers come back.
I’m not in San Miguel de Allende in December, so I can’t speak for how cold it is then, but I know that the temperature in San Miguel de Allende in January and in February is between 35 Fahrenheit to 42 Fahrenheit at the coldest, but by 11 o’clock, it’s up to 60 Fahrenheit, and by noon or 1 o’clock, it’s usually 65 Fahrenheit - 70 Fahrenheit.
The temperature during most of the fall and spring in San Miguel de Allende stays in the 70’s (Fahrenheit) in the daytime, but it gets quite cold in January and February at night. In March, the night temperatures are in the upper 40’s (Fahrenheit). May is the hottest month, and it’s the only month that is humid here in San Miguel de Allende, and that’s when the rainy season begins.
The humidity in May in San Miguel de Allende moves out in June, July and August. Even the temperature in April gets in to the low 80’s (Fahrenheit), but it’s not humid.
The best part about the weather in San Miguel de Allende is that the sun shines most days, which was one of the biggest shocks I had when I came here, because I come from a place where we have at least 70% of days without sun.
Where I come from, we’re known as the Seattle of the East. It just rains a lot. Even when it doesn’t rain, it’s cloudy, so we don’t have much sun. Because of this, outdoor activities have to be planned around the weather. Even in the summer when the weather is warm, you can’t plan outdoor activities ahead freely. I moved to San Miguel de Allende in January, and on the first day, I got up and went to see if it’s cold, or if it’s snowing or raining. I saw that the sun was out. On the sixth day, when I pulled the draperies open, I saw that the sun was still shining during the day for six consecutive days, I said, “Wow! It must shine here a lot!” It does. It’s unusual to have a cloudy or a rainy day all day.
(Mary Agnes McKay-- on our left-- on a sunny October day, San Miguel de Allende, Mexico, pictured.)