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The siamang tends to rest for more than 50% of its waking period (from dawn to dusk), followed by feeding, moving, foraging, and social activities. It takes more rest during midday, taking time to groom others or play. During resting time, it usually uses a branch of a large tree, lying on its back or stomach. Feeding behaviors, foraging, and moving are most often in the morning and after resting time. Grooming is one of the most important social interactions among family members. Grooming takes place between the adults earlier in the day, and then the adults groom the juveniles later in the day. Adult males are the most involved in grooming.

A siamang group at rest - siamangs rest up to 50% of their waking hours.

In the dry season, the size of the siamang's daily range is larger than in the rainy season. The siamang in southern Sumatra undertakes less foraging than the siamang in other places because it eats more fruit, so consumes more nutrients, which results in less time needed for looking for food. Sometimes, the siamang spends all day in one big fruiting tree, just moving out when it wants to rest and then coming back again to fruiting trees.[8]

Siamangs are a very social species of primates and exhibit a variety of tactile and visual gestures, along with actions and facial expressions to communicate and increase social bonds within their family group. Siamangs are also territorial and interact with other family groups by making loud calls to let other groups know where their territory is. The calls may be asynchronous, where they are not directed at a particular neighboring group, or simultaneous group calls may take place across the territory boundary. In addition, males chase each other across the boundary.Grooming frequency between males and females has been found to correlate to copulation frequency, as well as bouts of aggression. Pairs copulate during four to five months at intervals of two to three years. The peak of their reproductive activity is often during the time when fruit is most abundant.Dorsoventral copulation is the most common type in siamangs, where the female is squatting and the male hangs by his arms and grips the female with his legs, whereas ventroventral copulation, where both primates are suspended, occurs only one in 60 times on average

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