January in Jacksonville averages a daily high of 13.2°C with nights around 1.4°C. Expect roughly 10.1 wet days totalling 84.3mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Jacksonville is March–May.
Based on NEW RIVER MCAF, NC US (5.2km), 1995–2024. 26 years of January data.