The influence of temperature on the development and embryonation of Ascaris suum eggs was studied using coarse sand medium in an environmental chamber with 50% humidity. The time required for development and embryonation of eggs was examined under 3 different temperature conditions, $5^{circ}C$, $25^{circ}C$, and $35^{circ}C$. A. suum eggs did not develop over 1 month at the temperature of $5^{circ}C$. However, other temperature conditions, $25^{circ}C$ and $35^{circ}C$, induced egg development to the 8-cell-stage at days 5-6 after incubation. All eggs examined developed to the 8-cell stage at day 6 after incubation in the sand medium at $25^{circ}C$. The higher temperature, $35^{circ}C$, slightly accelerated the A. suum egg development compared to $25^{circ}C$, and the development to the 8-cell stage occurred within day 5 after incubation. The formation of larvae in A. suum eggs at temperatures of $35^{circ}C$ and $25^{circ}C$ appeared at days 17 and 19 after incubation, respectively. These findings show that $35^{circ}C$ condition shortens the time for the development of A. suum eggs to the 8-cell-stage in comparison to $25^{circ}C$, and suggest the possibility of accelerated transmission of this parasite, resulting from global warming and ecosystem changes.