Ferries/Speedboat during rainy season

Me and my friends will be traveling to Thailand for a week during mid-July and we will be flying out from Phuket. We want to stay in Phi Phi islands for 2 days. So we need help to understand if feries/speedboats run daily from Phuket to Phi Phi Islands daily during rainy season or if disruptions can be expected on some days? As we are on tighter schedule we want be sure if we can book our stay beforehand or if rain might not allow us to travel to phi phi islands.

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