Houston is plagued by poor weather much of the time. On the nights of the observatory open houses, check the open house page around sunset or later to make sure it will not be cancelled due to clouds. If it is raining, or has rained significantly during the afternoon, the observatory will be closed.

 Houston, Texas Forecast

Cloud cover for the US
Compilation of latest US weather satellite images
0-7 day Meteogram
8-16 day Meteogram