How do we know that the speaker in the poem rain in summer pleased to see the rain?

The speaker's positive feelings towards the rain in the poem "Rain in Summer" are indicated through the imagery and language used to describe the rain, such as "smiling down on the emptied streets." The speaker's appreciation for the rain is evident in the way it is portrayed as refreshing and rejuvenating, bringing relief from the heat of summer. The overall tone and mood of the poem also convey a sense of joy and contentment in witnessing the rain.