That is a very good question. A lot of ATC towers in Asia can't even understand when you ask "is the runway wet"?
If it's raining heavily and the runway is not grooved then be careful and if possible ask a preceding aircraft how his braking action was?
This happened in Tpe on rwy 24 ( which is not grooved ) and the ATIS was reporting "breaking action poor as reported by landing aircraft A330"
So I advised ATC that we required Rwy 23 which is grooved.
Qf have a policy of not landing on an un-grooved runway in heavy rain ( since their Bkk over run ) and it is quite possibly a good idea.