Belize does not go on Daylight Savings time. So right now we are only 1 hour behind Boston.
I have never seen a sweater here on the island. It will be in the 80's during the day and at this time of year we get showers not rain all day.
At the most you will use a rain poncho or wind breaker. Personally I just get wet and dry off very quickly. During Tropical Storm Arthur I did get soaked and had to change clothes but it is warm rain so no chills or adverse health effects.
Remember - this is sub-tropical - sun screen is more important than an umbrella.
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Harriette
Take only pictures leave only bubbles