Average temperatures, rainfall and packing tips for Dublin, Ireland in September
September in Dublin is typically mild, with average daytime highs around 16°C and nights near 11°C. Temperature-wise it sits mid-range for Dublin (the 5th warmest month).
Expect some rain: around 71 mm falls in Dublin during September on average.
If your dates are flexible, the most comfortable months in Dublin are usually July and August.
← Dublin weather tomorrow (live)
In September, Dublin averages a daytime high of about 16°C and a night-time low of around 11°C, based on recent historical data.
Expect some rain: around 71 mm falls in Dublin during September on average.
September is a workable time to visit Dublin, with mild days - just pack accordingly. If your dates are flexible, the most comfortable months in Dublin are usually July and August.