In September, Austin experiences a gradual shift from summer heat toward milder autumn temperatures. Daily highs average around 88°F (31°C), though temperatures can still reach the mid-90s°F (mid-30s°C). Evenings tend to cool down, with lows around 71°F (22°C).
Rainfall increases slightly in September, averaging about 2.5 inches over the month, with moderate humidity levels that make the warmth feel more intense. Sunshine remains abundant, with roughly 8 hours of sun daily, making it generally suitable for outdoor activities. As Austin enters fall, September offers warm, sunny days and cooler nights, along with occasional rain.
For the most accurate information, it is advisable to check a reliable weather forecast closer to the date of your visit, as weather conditions can change from year to year. For example, we recommend the Windy app.
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