Rialto

What is the climate like in Rialto?

The best time to visit Rialto is typically April – November, with trip comfort peaking in June (9.3/10). Rialto is warmest in August, when daily highs average 92°F (33°C), and coolest in January, when lows fall to about 42°F (5°C). The wettest month is typically January and the driest is June; the year sees roughly 17 in (441 mm) of precipitation.

• Best time to visitApril – November — comfort peaks in June (9.3/10)
• Warmest monthAugust — average high 92°F (33°C)
• Coolest monthJanuary — average low 42°F (5°C)
• Wettest monthJanuary (3.3 in (83 mm))
• Driest monthJune (0.1 in (3 mm))
• Annual precipitation17 in (441 mm)
• Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
• Records fromNorton AFB, 11 km away (1949-2026)