The heavens will be opened before the Pope arrives in Dublin, and it could still rain on the parade next Sunday.
Predictions suggest that, although tomorrow should be sunny, the rain might return for the massive Phoenix Park mass.
With Éireann has warned that Ireland can be hit with rain showers today, and there is also a chance of hail, with temperatures ranging from a "cool and airy" from 13C to 17C.
Tomorrow, however, plans to return to dry weather before the visit of Pope Francis to Dublin.
Although it will be cloudy, there will also be solar flares for those who are on their way to Croke Park or who want to catch a glimpse of the Pope traveling through the streets of Dublin.
Later, tomorrow night, the rain will spread to the western provinces, accompanied by extensive mist and hill fog.
Unfortunately, with Éireann for the hundreds of thousands of people who enter the Phoenix Park on Sunday, it predicts that it will be mostly cloudy and cool.
There will be occasional rain showers, again with low clouds and hill fog and moderate winds in the south or southwest.
Rain falls most likely in the afternoon in the Dublin area, which means that massagers have to pack something waterproof, although umbrellas are not allowed in the Phoenix Park during the Mass.
Temperatures during the day will be moderate around 16C, and cool down in the evening.
Meanwhile, next week a return to the mild, warm weather will be experienced, during which the temperatures will get warmer again and "a lot of dry weather and a lot of wind", said the national predictor.