lyon county area forecast 327 pm cdt mon may 20 2013 .tonight...partly cloudy in the evening...then mostly cloudy with a 30 percent chance of showers and thunderstorms after midnight. lows in the lower 70s. south winds 5 to 10 mph. .tuesday...partly sunny with a 30 percent chance of showers and thunderstorms. highs in the mid 80s. southwest winds 10 to 15 mph. .tuesday night...occasional showers and thunderstorms. lows in the mid 60s. south winds 5 to 10 mph. chance of precipitation 80 percent. .wednesday...partly sunny with a 50 percent chance of showers and thunderstorms. highs around 80. southwest winds around 10 mph. .wednesday night...partly cloudy. a chance of showers and thunderstorms in the evening...then a slight chance of showers after midnight. lows in the lower 60s. west winds 5 mph. chance of precipitation 30 percent. .thursday...partly sunny. a chance of showers in the morning... then a chance of showers and a slight chance of thunderstorms in the afternoon. highs in the mid 70s. chance of precipitation 30 percent. .thursday night...mostly clear. lows in the mid 50s. .friday...mostly sunny. highs in the mid 70s. .friday night and saturday...mostly clear. lows in the mid 50s. highs in the upper 70s. .saturday night...partly cloudy. lows in the lower 60s. .sunday...partly sunny with a 20 percent chance of showers and thunderstorms. highs in the lower 80s. .sunday night and memorial day...partly cloudy. a 20 percent chance of showers and thunderstorms. lows in the mid 60s. highs in the lower 80s.