Today and Wednesday are likely to be two of the hottest days of the year so far, and with the volatility comes a chance of isolated or scattered thunderstorms, starting tonight.

Showers and thunderstorms are likely Thursday afternoon and evening.

None of this will affect the Phillies, who are on the road all week.

Expect to see the mid to upper 80s for the next two days, topping May's previous high of 83, reached May 10, and perhaps challenged 2013's high of 89, reached April 10.

The records -- 95 for May 21 and 96 for May 22 -- seem safe.

Overnight lows should be in the high 60s.

Thursday will stay warm, with a high about 80, a mark also hit Monday. Top temperatures should slide back into the low 70s for Friday and the weekend.

There's a slight chance of thunderstorms this afternoon that becomes a 30 percent chance about 10 p.m. and continues overnight.

Thunderstorms are also possible during the period from late Wednesday morning to Thursday morning, before showers and thunderstorms become likely -- a 60 percent chance -- Thursday afternoon and evening.

Then the threat lessens but continues Thursday night through Friday afternoon.

Except for Thursday, little rain is expected outside of thunderstorms, which also pose the only threat for more than mild winds.

Fair skies return Saturday through Monday, Memorial Day.

The Shore should see highs in the low to mid 60s for the holiday weekend.

For more on the forecast, go to Philly.com's weather page.

Contact staff writer Peter Mucha at 215-854-4342 or pmucha@phillynews.com.