Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from West Tisbury to Nantucket as you normally would.
The most flights from MVY to ACK are scheduled on a Monday (2 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (2 on average).
In terms of precipitation, rainfall in Nantucket ranges from 1.6 - 4.3 inches per month. January is typically the wettest month, when rainfall can reach 4.3 in. June is typically the driest time to visit Nantucket when rainfall is around 1.6 in.
If weather is an important factor for your trip to Nantucket, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 66.2 F. Travelers looking to avoid the cold should look outside of February, when temperatures are typically at their lowest (around 32.0 F).