Abstract: Raising pigs on a microbial fermentation bed was a newly implemented and environmentally friendly approach. Temperature of the bed was critical for an appropriate operation. Thus, the surface temperature of the bedding materials, particularly in the heat of summer, was monitored. No significant temperature differences were found in the areas covered by the bedding material i.e., (30.13±0.86)℃ or where no such coverage was used in the feeding troughs (30.58±1.09)℃, drinking troughs (30.93±0.86)℃ or aisles (29.90±0.69)℃. On the other hand, the surface temperature of the beds inside the piggery was significantly lower than outside the construction i.e., (35.25±2.70)℃ vs. (41.44±2.12)℃. And, within a certain range, an increased pig breeding density did not, nor did amount of pig excretion, seem to significantly affect the bedding temperature.