The weather on August 3rd.

(1) According to the picture, the weather conditions in Yixing on August 3rd were: sunny to cloudy, with the highest temperature of 28℃, the lowest temperature of 19℃ and a light breeze;

(2) The highest temperature in a day appears around 2 pm. At this time, the temperature is as high as 29℃, and strenuous exercise is prone to heatstroke, which affects health;

(3) The weather symbol in option A represents rainfall, which is not suitable for outdoor sports, and the symbol in option B represents sunny days, which is suitable for drying clothes; The symbol of option c represents snowfall, which is not suitable for planting rice;

The symbol of option D represents thunderstorm, which is not suitable for aerial work. So I chose B.

(4) From the common weather symbols, A stands for the weather symbol of smog; So choose a.

(5) But now I remember that night, the storm, I don't know how many flowers were broken and described the weather; The spring breeze has not reached Yumen Pass, which means that it is difficult for the summer monsoon to reach Yumen Pass. Its characteristic is stability. This poem describes the climate.

So the answer is: (1) sunny to cloudy, the highest temperature is 28℃, the lowest temperature is 19℃, and the breeze; (2) The temperature is the highest in sunny days, with the temperature as high as 29℃, so strenuous exercise is prone to heatstroke, which affects health; (3)B；

(4) a;

(5) But now I remember that night, the storm, I don't know how many flowers were broken and described the weather; Yumenguan describes the climate.