Without the weather map to reference, I can give you a general approach based on typical weather patterns. If the forecast indicates rain and inclement weather, it would likely be better to avoid both Corpus Christi and Galveston. However, if one city shows milder conditions or less rainfall compared to the other, that might be the better choice.
For instance, if Corpus Christi has partly cloudy skies with a slight chance of rain while Galveston shows heavy rain, then Corpus Christi would be preferable for a beach visit. Conversely, if both cities are predicted to have significant rain, it might be wise to postpone the trip altogether. You’ll want to check local forecasts for the most accurate conditions.