Overnight...Cloudy. Showers likely late along with scattered thunderstorms. Warm with lows ranging from the mid 60s inland to the upper 50s along the lake Ontario shore. South winds 10 mph or less...Becoming southwest 10 to 15 mph. Chance of rain 60 percent. Thursday...A chance of showers in the morning...Then showers in the afternoon. Much cooler. Early afternoon highs ranging from the lower 60s along the lake shore to around 70 inland...Then temperatures falling to the upper 50s along the lake shore and to the mid 60s inland. Southwest winds 10 to 15 mph...Becoming west. Chance of rain 80 percent. Thursday Night...Showers. Lows in the lower 40s. Northwest winds 10 to 15 mph...Becoming north. Chance of rain 80 percent. Friday...Cloudy with showers likely in the morning...Then partly sunny with a chance of showers in the afternoon. Cool with highs in the upper 50s. North winds 10 to 20 mph...Becoming northwest. Chance of rain 70 percent. Friday Night...Mainly clear. Lows in the lower 40s. Northwest winds 10 to 20 mph with gusts up to 30 mph in the evening. Saturday...Sunny. Highs in the lower 60s. Saturday Night...Mainly clear. Lows in the lower 40s. Sunday...Sunny. Highs in the mid 60s. Sunday Night...Partly cloudy. Lows in the mid 40s. Memorial Day...Mostly sunny. Highs in the upper 60s. Monday Night...Mainly clear. Lows in the upper 40s. Tuesday...Mostly sunny. Highs in the mid 70s. Tuesday Night...Mainly clear. Lows in the mid 50s.