Some patchy light frost may occur by morning far west and northwest sections toward the Fox Valley and McHenry county and west. Rainy periods up into the midday hour, then rain ends from the north with clouds breaking later Thursday quite possibly allowing some sunshine before nightfall. Strengthening north to northeast winds 12 to 24 mph and gusty producing daytime readings 16 or more-degrees below normal! Temperatures settle into the upper 40s or low 50s by late Thursday morning and afternoon on area beaches and lakeshore locations. Clearing inland Thursday night, scattered clouds may linger along Lake Michigan. Overnight lows ranging from 34 chilliest far west and northwest locations to 38 O'Hare and 43 to 48-degrees Chicago lakeshore and other shoreline locations.

Readings are to average close to 10-degrees below typical late May levels! North to northeast winds, but at a fraction of Thursday velocities, averaging just 4 to 9 mph -- a little higher lakeshore areas as the day begins. Mainly clear Friday night with temps retreating to the mid 30s well inland ranging to the mid 40s Chicago lakeshore. Skies cloud over toward Saturday morning. The official O'Hare reading is likely to bottom out around 40-degrees with light southeast winds taking hold.

Many hours -- more than likely a majority of them -- are likely to remain dry and rain-free. But there is a light shower or two may occur over around 20 per cent of the metro area and areas south of the area are most favored. Southeast winds 5 to 14 mph.

Temperatures at levels comparable to those predicted Friday and Saturday. Southeast winds 7 to 18 mph mean there will be a degree of cooling on area beaches and other locations adjacent or close to Lake Michigan. A few spotty showers, possibly even an errant thunderstorm are to be in the area. But, from this distance, it appears rain isn't likely to be an all day affair. There's likely to be a respectable number -- if not a majority--of rain-free hours.

Scattered showers and thunderstorms are likely to be more numerous than in recent days, particularly in the afternoon and Monday night. Up to 40 per cent of the metro area may see one at any given time. Better organized, stronger southeast winds continue, cooling lakeshore areas, albeit moderately. Peak temperatures: From the mid 70s inland to the mid 60s near Lake Michigan.

Mostly cloudy and windy with July-level temperatures and several clusters of thunderstorms possible. Southerly winds 12 to 24 mph and gusty.

A scattering of showers and potentially active or severe thunderstorms affecting up to 30 to 40 per cent of the metro area. South/southwest winds increasing 12 to 24 mph and gusty.