Warm all year. Water around 26°C. Air temperatures average 24°C during the day and 20°C at night. It receives less rain than other tropical areas, and maximum temperatures average 80°F with only moderate humidity. The rainy season lasts from December to April when temperatures and humidity are higher (most extreme from January to March). The greatest number of thunderstorms occur in December and February. Annual rainfall at Nuku'alofa averages 58 inches, with as much as ten inches falling in April and as little as one inch in May and July. Vava'u is the wettest group. In contrast, during the Tongan winter (June to August), temperatures can occasionally be quite cool. The period from November to April brings on the cyclone season. Tonga averages two tropical hurricanes every year (sometimes as late as May). Severity of thunderstorms, probability of cyclones, rainfall, and temperatures increase farther north in the kingdom. During summer (especially from February to March), north winds bring heat, waves and heavy rains.

Recommended wind for kitesurfing is wind coming from E and SE .

There is Trade wind at Mounu Island, Tonga.

Working with all wind directions. May to November are characterized by Southeast trade winds, while Easterlies prevail the remainder of the year. Severe weather is usually preceded by West and Northwest winds. During summer (especially from February to March), north winds bring heat, waves and heavy rains. Wind speeds average 12-15 knots (slightly less in Tongatapu).

Wind usually blows from E and SE on the spot.

The best moments to come to Mounu Island, Tonga are May, June, July, August, September, October and November .

Mounu Island, Tonga is a Shallow, Flat and Chop spot.

The launching/landing area is reported to be of Small size.

Small beach with white sands. Trees close by. Some parts of the beach with a bit of reef.

Beautiful water. Flat water and with stronger wind choppier. Shallow area. There is some reef downwind of the launch spot but after that it is obstacle free and a good spot for learners as it starts shallow enough to stand in but eventually becomes deep and clear downwind of the main kite area.