Climate almanac

Rialto

California, US · 34.11°, -117.37°

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What is the climate like in Rialto?

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 of precipitation.

  • Warmest monthAugust — average high 92°F (33°C)
  • Coolest monthJanuary — average low 42°F (5°C)
  • Wettest monthJanuary (3.3 in)
  • Driest monthJune (0.1 in)
  • Annual precipitation17 in