In September, San Luis Rio Colorado typically sees daytime highs of 38.5°C and overnight lows around 20.8°C. Compared to the annual average high of 31.0°C, September runs +7.5°C.
September in San Luis Rio Colorado averages a daytime high of 38.5°C and an overnight low of 20.8°C.
September runs +7.5°C compared to San Luis Rio Colorado's annual average high of 31.0°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 38.5°C and cooler evenings around 20.8°C.