mclean county area forecast 544 pm cdt sat may 25 2013 .tonight...mostly cloudy. lows in the lower 50s. east winds 5 mph. .sunday...partly sunny. a 20 percent chance of showers and thunderstorms in the afternoon. highs in the lower 80s. southeast winds 5 to 10 mph. .sunday night...partly cloudy with a 30 percent chance of showers and thunderstorms. lows in the upper 50s. southeast winds 5 mph. .memorial day...partly sunny with a 30 percent chance of showers and thunderstorms. highs in the lower 80s. south winds 10 to 15 mph. .monday night...partly cloudy. lows in the lower 60s. south winds 5 to 10 mph. .tuesday...mostly sunny. highs in the mid 80s. .tuesday night...mostly clear. lows in the mid 60s. .wednesday...mostly sunny. highs in the mid 80s. .wednesday night through thursday night...mostly clear. lows in the upper 60s. highs in the upper 80s. .friday...partly sunny. highs in the mid 80s. .friday night...mostly clear. lows in the upper 60s. .saturday...partly sunny. highs in the mid 80s.