An Indian summer usually means a period of unseasonably warm and dry weather that sometimes occurs in early Autumn.
A high-pressure weather system brings clear skies and warm and dry weather.
Speaking about mid-September onwards, Irish Weather Online expert Prof Peter O'Donnell said: "Some [weather] models are indicating a more settled spell after mid-month for Ireland as a high pressure builds up and stalls over western Europe."
Prof O'Donnell said it's difficult to predict if Hurricane Florence will reach Ireland.
He said: "Florence has been reduced to a tropical storm again but is expected to mount a comeback near Bermuda, then go into some sort of long-term meandering track off the east coast of the United States.
"None of that is really very certain at this point so trying to estimate what could happen ten days from now is difficult.
"Then there are likely to be two trailing tropical storms in the east central Atlantic, with similar large uncertainties about their future evolutions."
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