July is a very similar story to June; a mixed bag in terms of weather. The centre of Vietnam remains hot and predominantly dry with the odd light shower expected. The south is now in the midst of its wet season with daily downpours to be expected whilst the north is well into summer mode with high temperatures and rain the norm. Visitor numbers remain lower than earlier in the year and the central beaches still promise a great deal of sunshine. Trekking is off the cards for most regions however, with more rain in the northern mountains and central highlands.
The north of the country remains in summer meaning you can expect plenty of hot weather as well as rain and at times storms (avg temp: 30 °C). Halong Bay and Hanoi are prone to heavy showers at this time of year, infact July is one of the wettest months of the year in Hanoi. The mountains to the north are also very wet with trekking unadvisable throughout the month.
The good news continues on the beaches of Hoi An, Danang and Nha Trang with plenty of sunshine and blue skies expected throughout the month. Temperatures remain high and whilst still predominantly dry, the odd shower is not out of place helping to temper the hot weather (avg temp: 31 °C). Hue is experiencing similar conditions but to the west Dalat and the Central Highlands high rainfall makes extensive trekking and adventure activities unadvisable.
The south is now firmly into its wet season. However this is unlikely to be severe and whilst the showers will be slightly heavier than in previous months you can still expect plenty of dry and bright daylight hours (avg temp: 29°C). If you're planning to dive around the island of Con Dao, favourable water conditions can still be enjoyed in July, although realistically it is the last month of the dive season.