Rain in a sad scene invites an easy interpretation. Before treating it as an emotional mirror, ask a practical question: what does the weather prevent, delay or make possible?
Track the changed action
Two characters might shelter beneath the same doorway because of a downpour. A conversation then becomes possible that would not happen on a dry walk. The useful observation is the change in their situation, whether or not either person feels gloomy.
Test the mood reading against the details
Look for someone who reacts differently to the same weather. One person may welcome the delay while another worries about a journey. That contrast complicates the idea that the landscape expresses one shared emotion. Keep your first interpretation available, but let the scene resist it.
For a short reading note, record the weather, the interrupted action and the new interaction in three separate phrases. Revisit them after the scene ends. If nothing practical changes, the atmosphere itself may deserve closer attention. If much changes, your explanation now has a concrete chain of events instead of relying only on the familiar association between rain and sadness.
