Source: Jim Noel
After a very wet September across all but northwest Ohio in the Maumee River basin, we can expect more of the same in October. September saw some locations in the top 5 wettest on record for Ohio like Columbus and Dayton.
We expect the first two weeks of October to average 5-15F above normal with a few days almost 20F above normal. There will be a few days this week with lows of 65-70 degrees which is almost unheard of in October with normal lows in the 40s. The latest low of 70 at Cincinnati is Oct.9 in 1982, since 1947. It is possible to be near that level a few days this week across especially southern Ohio.
Overall, temperatures the first two weeks of October will average 5-15F above normal with the last two weeks 0-4F above normal.
Rainfall will average 1-4 inches the first half of October. The 1 inch will be in southern Ohio and the 4 inches would likely be in the north part of the state. Normal is 1-1.5 inches for two weeks.
See rainfall map above.
Rainfall may relax to more normal with a chance of below normal the second half of the month. The worst of the rain will be in the central and western corn and soybean areas where rainfall of 3-7 inches is possible so harvest delays are possible.
It continues to looks like frost will be no earlier than Oct. 10-20 range which is normal for Ohio but chances are growing it may be more in the Oct. 20-30 range.