Actual temperature when inflating does not matter. Inflate to the person's weight and water conditions. Where temperature comes in, is when it changes, the board is left in the sun for example. It can get hotter, air expands and put board seams under pressure. Likewise if you inflate the board on a hot day, and then paddle in a cold lake, the PSI will go down.
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Does the 15-18 psi depend on how hot the location you are paddling in or the person's weight?
Actual temperature when inflating does not matter. Inflate to the person's weight and water conditions. Where temperature comes in, is when it changes, the board is left in the sun for example. It can get hotter, air expands and put board seams under pressure. Likewise if you inflate the board on a hot day, and then paddle in a cold lake, the PSI will go down.