Pool water level increasing due to rain--When should I drain some water?

Pump it down to just below the top of the skimmer. If the water is above the skimmer opening, it won't work properly to keep the surface clean. That's my rule of tomb anyway when mine fills up with rainwater.
^^^^^^^^What he/she said

You want sufficient clearance between the top of the water and the top,of the weir door to,allow leaves and such to flow into the skimmer.
 
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