The three-day weather warning issued by Met Éireann has been updated this morning to last just two days, with the status yellow alert now ending at midnight on Monday.
The forecasters have predicted exceptionally warm weather for the next two days, with daytime temperatures of 25 to 30 degrees generally and possibly up to 32 degrees in places on Monday.
East Galway will see the hottest weather in the county, with over 30 degrees expected in towns such as Ballinasloe.
In coastal areas, and especially in Connemara, temperatures could be as much as 10 degrees cooler than in the east of the county. The highs in Clifden and Roundstone will be in the early 20s.
Nighttime temperatures will also be unusually high, ranging from 15 to 20 degrees.
People have been urged to stay hydrated, away from direct sunshine and to take care if swimming in the sea or in lakes.