Will I be cold?
Will I be cold in Austin in January?
Verdict
Yes — Yes, cold.
Lows drop to 39°F on average — noticeably cold, especially after sundown.
Day vs. night
Day
59°F
Comfortable
A T-shirt and a light overshirt is enough.
Night
39°F
Cold
Cold enough that a hat and gloves become mandatory.
Why
Austin in January averages highs of 59°F, lows of 39°F, 8 rainy days.
Plan for real winter kit — an insulated coat, warm hat, and gloves rather than a light jacket.