If the forecast is looking grim, why not head to Lao National History Museum? You'll be fascinated by just how many interesting facts you can discover about the past here.
You'll soon discover why this Vientiane collection of historical artifacts is popular with travelers. If you're searching for other things to see here, Patuxay, Ban Anou Night Market, and Talat Sao are in the area as well. They won't take you very long to reach from Lao National History Museum.