Africa

In July, in the Northern Hemisphere it's mid-summer: in North Africa, in countries overlooking the Gulf of Guinea and in Sahel, there is the monsoon, with rain and clouds, while in the Red Sea it's too hot. In Cape Verde the rains may start in the second half of the month. Along the coast of Morocco there can be fog and mist in the morning, and the sea is cool, but all in all you can go. In the Southern Hemisphere it is winter, and even at tropical latitudes it can be a little cool. In the Seychelles, in theory you can go, even though a strong wind often blows. In Mauritius it can be a little cool, and there can be a bit of wind and some rain.
Where to go: Azores, Canary Islands, Comoros, Madagascar (north), Madeira, Morocco (Atlantic Ocean), Mayotte, Mozambique (north coast), Tanzania, Zanzibar.

Asia

It's mid-summer, and the monsoon ruins the weather in much of south-central Asia, but it spares some parts of Indonesia.
Where to go: Bali, East Timor

North and Central America

In the Gulf of Mexico and Central America the weather is hot, muggy and rainy, and there's some risk of hurricanes. In California and Baja California it's sunny, but the sea is a bit cold.

Caribbean Sea

It's a hot and muggy month, with frequent showers and some risk of hurricanes. In the northern islands, such as Cuba, in this month there is a relative decrease in rainfall.

Mediterranean Sea

It's the central month of summer, with sunshine guaranteed almost everywhere, especially in the central and southern part, while we can not exclude some showers in northern Italy, France, Slovenia and northern Croatia, and along the Black Sea coasts of Bulgaria and Romania. The eastern Turkish coast of the Black Sea remains quite rainy even in summer. The southern coast of Turkey is sunny, but it can be a bit hot. You can also go in Portugal and in the Atlantic coast of Spain, where, however, the sea is a bit cool.
Where to go: Albania, Algeria, Bulgaria, Croatia, Cyprus, Egypt, France, Greece, Israel, Italy, Lebanon, Morocco, Malta, Montenegro, Romania, Slovenia, Spain, Tunisia, Turkey (west and south coast), Ukraine

South America

In the Southern Hemisphere it's winter. In the north of the continent, in the Northern Hemisphere, it's summer, so it's hot and rainy.

Oceania

It's winter in the Southern Hemisphere, which means that there is a wide choice, among the islands that lie at tropical latitudes (but not too far to the south), where you will find sunshine, little rain, and a pleasantly warm weather tempered by the breeze.
Where to go: Australia (Darwin), Cook, Fiji, Christmas Island, Nauru, Niue, Papua New Guinea (Port Moresby), French Polynesia (Tahiti, Bora Bora), Solomon Islands, Samoa, American Samoa, Tokelau, Tonga (north-central), Tuvalu, Vanuatu (north), Wallis and Futuna