August in Tena is the windiest month of the year. In August, the weather in Tena is typically warm. Average daily high temperature in August is about 25 degrees above zero. On average, Tena has 18 partly cloudy, 8 sunny, 4 cloudy, and 1 rainy day in August. The rains are usually light. August as well as January, June, July, and September is considered the most comfortable time to visit Tena.