The October weather guide for the Bahamas shown below is for Nassau. Weather in Bahamas in October. The average maximum daytime temperature in Bahamas in October is a hot 30°C (86°F) with high heat & humidity. There are usually 7 hours of bright sunshine each day, which represents 61% of the 12 hours of daylight. The average sea temperature in and around Bahamas in October is 28°C (82°F).