Bermuda’s weather climate is sub-tropical, mild in the winter, spring and autumn (fall), but from late May to October, can be uncomfortably hot and with especially high humidity. The hottest part of the year is from May through mid-October, when temperatures hover between 75°F / 23°C and 85°F / 29°C. Humidity, often well over 85%, is at its highest from July through mid-October.
Despite its latitude and longitude – and its location so far north of the Caribbean, nearly a thousand miles north of it in fact – Bermuda is entirely frost-free, snow-free and ice-free. Why? Because the warm waters of the Gulf Stream pass near Bermuda.
However, it can be favorable to hay fever sufferers. Rag weed does not exist in Bermuda and pollens of other weeds are quickly blown out to sea. But note that for those with allergies., the always humid climate breeds mold, mildew and mites. Some pharmaceuticals available without prescription elsewhere require prescriptions in Bermuda from registered local medical doctors. Not all drugstores in Bermuda are licensed dispensing pharmacies. You will have to visit one of the latter in the City of Hamilton or the Town of St. George to obtain anything locally prescribed but perhaps not carried by a hotel drugstore.
Bermuda’s ocean winds are tempered by the Gulf Stream, but when south winds prevail, the humidity rises and sometimes thunderstorms occur. The highest humidity months are July and August. Temperatures rarely drop below 55 degrees F or exceed 90 degrees F. The lowest air temperature ever recorded was 43.6F. The highest was 94F. Water temperatures during winter months are much the same as the air temperature, ranging from about 66F (in January) through 75F until the late spring.
Enough annual rainfall is one reason why Bermuda is usually lush in foliage and greenery despite its very shallow alkali soil. There is no monsoon or rainy season because Bermuda is not in the Caribbean, but some months tend to be wetter than others. But others can be devoid of much rain. Also, several – like late June, July and August in particular and early September – can be extremely (and unpleasantly) humid. If this affects you badly, and you don’t mind cooler water for swimming, then try May or June or late September to October.
For weather forecasts, check the Bermuda Weather Service page. It is a Bermuda Government service, provided by the Ministry of Transport’s Department of Air Operations.