The best time to go to Rio Vista is during the warmer months, roughly from late spring to early autumn, specifically May through October.During these months, the weather is typically sunny and warm, with average temperatures ranging from 20°C to 30°C. This period is ideal for enjoying outdoor activities on the Sacramento River, such as boating, fishing, and watersports, which are popular pastimes in the area. The lower chance of rain makes it superb for exploring the Delta region's natural beauty.For those interested in fishing, particularly for striped bass, the peak season often falls within these months, especially in spring and early autumn.