Trinidad and Tobago sit at the southern edge of the Caribbean, just off Venezuela. The climate is tropical and the islands are largely below the hurricane belt — direct hits are rare, which is one of the country's quiet advantages.
Dry season (January–May) is the peak time. Sunny, breezy, low humidity, and aligned with the country's biggest event: Carnival, in the week leading up to Ash Wednesday. Port of Spain in carnival week is one of the great street parties of the world; rooms book out a year in advance and prices triple.
Wet season (June–December) brings short heavy afternoon showers, especially September–November. Mornings are usually clear. The wet greenery is at its best, and prices are much lower outside the holidays.
Tobago's leatherback turtle nesting runs March through August on the north and east beaches — Grande Riviere and Turtle Beach are prime spots, with regulated night tours.
Diving off Tobago is excellent year-round, but visibility is best in the dry months.
If you cannot do Carnival, target Tobago Heritage Festival in late July or Divali (October/November) for a quieter cultural window.