The wetter than normal pattern has lasted longer than expected this spring. Temperatures have behaved as expected though.
The outlook for the remainder of May calls for above normal temperatures and near normal to above normal rainfall.
The week of May 16 will be much warmer than normal with highs reaching into the 80s in many areas with rainfall more limited this week but by late week into this weekend rainfall be increasing again so the big window for planting this week will be through Thursday.
The week of May 22 will be cooler with temperatures normal to slightly below normal and rainfall close to normal though the rains will be lighter events.
The outlook for June calls for slightly warmer than normal with rainfall starting the month wet then turning drier.
The outlook for July and August still calls for the turn to warmer and drier than normal conditions.
Here is the link to the monthly model forecasts: http://www.cpc.ncep.noaa.gov/products/CFSv2/htmls/usPrece3Mon.html
In summary, warmer than normal will be the rule this growing season with a turn from wet to dry over time.
You will note a shift of the wetness this spring in the eastern corn and soybean belt to the western half. The outlook for the rest of May in the attached image from the NOAA/NWS/Ohio River Forecast Center shows the real wet areas western half while the eastern half sees wetness not as far from normal.