Temperature
Hot by day, warm at night.
Hamilton is most comfortable in spring and winter. Summers are warm and winters are mild. Rain is frequent in most months.

Hot by day, warm at night.
Recurring showers across the month.
Plenty of sun this month.
Hot afternoons occur, with humid air through much of the month.
In August, afternoons feel about 83° and nights feel near 82°.
Partly cloudy across the month.
August stays around 80°F through the day and night.
August's typical breeze keeps the air from feeling as stagnant.
Want a side-by-side climate view? Compare Hamilton with St. Lucia.
Typical monthly values are based on long-term climate records. Useful for planning, not a forecast. Check the weather before you travel.
Local microclimates can vary by beach, neighborhood, trail, or elevation.
Last updated: Jun 1, 2026
Data & methodology