Weather?

I know this may be a silly question but from anyone with past experience could you tell me what the weather was like mid September to late October (thats when I walk) I'm normally hot all of the time and very rarely wear a winter jacket and I live in Ireland where it can be quiet miserable in the winter. Does it get very cool in the evenings plus just with hours of sunshine, is it similar to Ireland where but mid October it gets dark normally before 6pm? Thanks