Summer in Cambodia is rainy and windy. Monsoons from the ocean bring clouds and brief, heavy downpours. There's no dreary, lingering, drizzly weather here. A solid pouring wall passes and the sky again shows the sun. Tours to Cambodia in June are not so popular, and you can find savings. Cambodia vacation prices drop in early summer, and in June it is already noticeable. In Phnom Penh and Sihanoukville +32°C during the day, +23-24°C at night. The water in the Gulf of Thailand is still warm - +27°C, but after the rains and wind there are fewer tourists swimming. However, locals are used to the humid summer and are finding it to their advantage.
Cambodia has many large rice plantations where all members of the family work hard. Rice is considered one of the most popular and frequently used products in the national cuisine. A summer vacation in Cambodia is more excursive than seaside, and with so much rain there's not much to do in the natural parks. Limit yourself to the capital, and Siem Reap is relevant at any time of year.
If you don't know which cities and resorts you can travel to on a budget, use tripmydream. It will find the most cost-effective tours to Cambodia in summer. The average price for excursion tours to Cambodia in June will be 1400 USD for one with flight and accommodation for a week.
