we often go out that way between September and November.
Sept/Oct is grape picking season and usually gets away with reasonable weather. Too much rain and not enough sun during these months makes for a poor vintage and its always a vineyard’s gamble to see how long to leave the grapes on the vine in the hope of some late season ripening before the rains and winds come in.
Its sounds like you wont be far from Le Blanc, nice town, good market, and the lakes in the Natural Park between Le Blanc and Chateauroux.
If you’re interested in wine and some day trips I recommend Saumur and Chinon which both have good Maison du vin for tasting etc. My favourite wines from the Loire though if you end up shopping for some are: Saumur Champigny, St Nicholas de Bourgueil, and my favourite of all is the Savennieres.
Methode Traditionelle (fizzy wine like Champagne, but older and better) is a big thing in Saumur and the main producers have open houses for tastings etc.
Enjoy your trip.