gallatin county area forecast 339 am cdt thu may 23 2013 .today...mostly cloudy. a 20 percent chance of showers in the afternoon. highs in the lower 70s. west winds 5 to 10 mph in the morning shifting to the northwest around 15 mph in the afternoon. .tonight...partly cloudy in the evening then clearing. lows in the mid 40s. north winds 10 to 15 mph. .friday...sunny. highs in the lower 70s. northeast winds 5 to 10 mph. .friday night...clear. lows in the mid 40s. northeast winds 5 mph in the evening becoming calm after midnight. .saturday...mostly sunny. highs in the mid 70s. southeast winds 5 mph. .saturday night...mostly cloudy with a 30 percent chance of showers and thunderstorms. lows in the mid 50s. .sunday...partly sunny with a 30 percent chance of showers and thunderstorms. highs in the mid 70s. .sunday night...mostly cloudy with a 30 percent chance of showers and thunderstorms. lows in the upper 50s. .memorial day through tuesday...partly cloudy with a 30 percent chance of showers and thunderstorms. highs around 80. lows in the lower 60s. .tuesday night and wednesday...partly cloudy. lows in the mid 60s. highs in the lower 80s.