Extensive travelers here- but first time to Asia.

I love Asia and have been to Thailand, Cambodia, Vietnam, China and Japan, 7 trips. You do not want to go in monsoon season. Check other Asian countries' weather for your dates and find which is best. A large country like China has many diverse climates. We have always traveled to Asia in spring and fall. I have enjoyed all of our trips to Asia but Japan was the easiest and ranks as a big favourite. However, summers are hot and humid. Research more on weather and come back here with more questions.

Start by checking historical weather data here. Pop in a city and you can see detailed data by day for any month for the last 10 years. The north of Thailand - Chiang Mai and Chiang Rai may be better than the center (Bangkok) or the south, since it's mountainous so less humid and possibly not quite as hot. In general, you are probably looking at weather like Houston only hotter, but just as humid, and often some rain, for anywhere in Southeast Asia.

Consider Australia or New Zealand or South America instead, where it's early winter.

I would not do it. Check this site out for some ideas as to where it’s the driest in June.
I loved my time there many years ago.
https://www.travelfish.org/weather/thailand/june

Thanks for the advice, I think we will modify our plan and go to Tokyo instead. Any ideas here?

With two weeks, are you considering adding Kyoto and some side trips from Tokyo? These might include Hakone, Nikko, Kamakura, etc.

I’m late to this topic but you have been misinformed. The rainy season starts end of May but the Thai monsoon season is Aug-October. There’s rain in June/July but similar amounts to the eastern half of the US for those months. June is generally better than summer (March-April-May) because it’s cooler due to some rain.

For the Malay peninsula only: The Andaman Sea coast beaches (Phuket, Krabi) may have monsoon rains in June but Ko Samui and other Gulf islands are dry then.

You’re not too late, and thank you ;) after much discussion, we’ve decided to go to Phuket late May and early June. If it rains some, we won’t be too disappointed. I’d still appreciate any good info on trips and such if anyone has ideas . Thanks!

I’m kind of if the feeling that a beach is a beach, so for June the drier Gulf islands like Ko Samui or Koh Chang over by Cambodia are much less likely to have rain, whereas Phuket is in the part of Thailand were monsoon-type rains are more likely in June.

I visited Krabi late May and it wasn’t rainy, however.

TOM is spot on with his suggestions. I would not choose touristy Phuket. All the others Tom mentioned are much nicer. Again check weather and in my experience rain showers are brief and followed by sunshine and humidity LOL I also think Cambodia and Viet Nam have much to offer your family. Happy travels.