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There is a database with river levels across the world (derived from satellite data), but unfortunately the Ticino river is not in that dataset.
There is also this site that publishes water levels of basins along the Ticino river:
Unfortunately I can't read Italian, so not sure if this is actually useful.
Finally I found this floodalarm site that publishes the water level at different places along a water body:
Perhaps this is helpful, depending on where on the Ticino river you want to kayak.
Best would be to contact a local kayaking/rafting tour company, they will be able to tell you the most accurate situation.