On average, some of the hottest places to visit in May are:
Cancun (37.5 °C)
Bangkok (34.6 °C)
Singapore (32.3 °C)
Phuket (32.3 °C)
Cairo (31.9 °C)
Las Vegas (31.4 °C)
Orlando (31.3 °C)
Dominican Republic (31 °C)
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May offers some of the best weather of the year, and will have warmed sufficiently by the end of the month that it now feels like summer—with an average high of about 75°F (24°C), it's the perfect time for a beach vacation. There's little chance of rain, with plenty of sunshine and clear blue skies.
If you're looking for a beach holiday, the Costa del Sol and the Costa de la Luz are the hottest places to stay in Spain in May. Malaga will be around 25ºC with Marbella around 24ºC, each with 9-10 hours of daily sunshine.
Crete. Crete is the southernmost island in Greece and enjoys average May daytime temperatures of 23 degrees/74 Fahrenheit making it one of the warmest greek islands to visit in May. The water is usually warm enough for swimming and the weather is usually calm, with occasional showers.
In the north of the country, Porto is seeing highs of 54°F (68°C), though some showers are still to be expected, so go prepared. It's balmier and drier still as you move further south to Lisbon, where highs are notching 72°F (22°C) and there are just five days of rain to contend with.
May is an undoubtedly a warm, dry and sunny month with temperatures reaching into the mid-20s, with the warmest temperatures in the south of the island. The weather is generally very predictable, with usually 9 hours of warm sunshine a day. May is a great time to go to Tenerife before the summer heat ratchets up.
Though daily average temperatures are in the low to mid-60s°F (16°C-18°C) across the country, nightly temperatures drop 10 degrees, so be sure to pack accordingly, warm clothes for the evening and plenty of sunscreen.
This one is a close call with both destinations seeing temperatures sitting in the balmy mid- to late-twenties during the summer months. Out of the peak season, the Greek island of Crete warms up as early as May hitting around 25C, while the Algarve isn't far behind at around 22C.
The average high temperature in Majorca during May is 23ºC, so you'll be spending lots of time sunning yourself at the beach or by the pool. Have some fun at the shops picking out your new swimwear, but make sure you leave some space in your suitcase for some warmer clothes, as things can get quite cool at night.
The weather is warm and sunny in Ibiza, Spain in May, making it a fantastic time to visit. The average temperature starts off at around 16.5°C in the first few days of the month and steadily rises until it reaches 21.5°C toward the end of the month.
While in April they have (on average) the same number of hours sunshine per day (11), Lanzarote is hotter - high of 25c v 22c, low of 17c v 11c and slightly drier 6mm v 12 mm of rain.
In May, much of Europe starts to warm up. You'll find temperatures happily above 20? in Greece, Spain, Italy and the South of France. Go further south, and you'll be treated to even hotter days – on Turkey's Turquoise Coast, the average May temperature is 27?.