The temperature of the city is warm and tropical, moderated by the marine breeze which circulates through its avenues.

Depending on the season, maximum temperatures are typically between 26°C (78.8°F) and 33°C (91.4°F) in the day and 18°C (64.4°F) and 25°C (77°F) at night. Temperature extremes have ranged between a maximum of 39.5°C (103.2°F) and a minimum of 9.5°C (49.2°F).

More temperate conditions occur from November to February and it is hottest from April to September, due to proximity to the Caribbean and Gulf humidity is high all-year around (averages close to 70% on rain free days). Ocean borne breezes temper the heat and humidity, especially in Coastal areas. All hotel rooms in the Hotel Zone and many on the mainland are air conditioned.

Light and summer clothing made from natural fabrics like cotton is best for everyday wear. Casual dress is acceptable for most situations and occasions but some establishments may require a more formal dress code. It is always advisable to check beforehand on dress regulations, if any. Smart casual attire for all Conference sessions and social functions is advisable.