temperature in dublin, ireland in july
1 The average temperature in Dublin in July is mild at 15 Â°C (59 Â°F). 2  Afternoons can be somewhat warm with average high temperatures reaching 18.9 Â°C (66 Â°F). 3  Overnight temperatures are generally quite mild with an average low of 11.4 Â°C (52.5 Â°F).  The mean diurnal temperature variation/ range in July is 7.5 Â°C (13.5 Â°F).