Sabethes gymnothorax is a diurnal, canopy-dwelling mosquito.
Blood-seeking females approach potential hosts slowly and tend to alight on the nose or around the head.
Females oviposit while hovering over a water-filled container.
Larvae are predaceous - they attack and consume other mosquito larvae in the laboratory.
Larval development takes 4–5 weeks at 25°C under laboratory conditions.
Nothing else is known about the biology of this species.