It has an average elevation of . Bahraich has a warm humid subtropical climate with hot summers from April to July. The rainy season is from July to mid-September when Bahraich gets an average rainfall from the south-west monsoon winds, and occasionally frontal rainfall will occur in January. In winter the maximum temperature is around and the minimum is in the range. Fog is quite common from late December to late January. Summers are extremely hot with temperatures rising to the range, the average highs being in the high of 30s (degree Celsius). Average annual rainfall is (approx).