-- In Generations 6+ --
Base Power of Surf: 90
STAB boost to power: actually, zero. STAB boosts the otherwise final damage total, not neccassarily the power.
Life Orb boost to power: 30%
Rain boost to power: see description of STAB
Total Power of Surf: 120
-- In Generations 1-5 --
Base Power of Surf: 95
STAB boost to power: actually, zero. STAB boosts the otherwise final damage total, not neccassarily the power.
Life Orb boost to power: 30%
Rain boost to power: see description of STAB
Total Power of Surf: 123.5
Source 1: Bulbapedia articles for all of the listed phenomena
Source 2: Math
Hope I helped!
