Source for track weather

[dragon49]

For past results, do any sources list whether it was raining at post time?

[kingfin66]

I am pretty certain that the Equibase results PDF charts include the weather for each race.

[cj]

For past results, do any sources list whether it was raining at post time?

Any of the chart data files that are available from various sources will also have the same info somewhere in the structure.