Torrential rain on the road from Phnom Rung to Phimai

The temperature here in Isan (northeast Thailand) has been in the high 90's with about 90% humidity. Officially Thailand has three seasons - hot, rainy, and cool - but more typically farangs (foreigners) refer to the seasons here as "hot" and "hotter". We are here in the rainy season which is from June to October; although we have experienced rain only on 2 days so far - a torrential downpour on our way home from Phanom Rung and then another rainy day this past week here in Phimai.