Weather Alert
Rialto Weather Warning NWS WEATHER ALERT FOR THE RIALTO, CA AREA - Issued: 744 PM PDT Wed Sep 9 2026 Rialto Weather Warning

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Rialto, CA Weather Forecast

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Rialto, CA Weather Forecast

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Rialto CA weather - Clear - 84°F
Clear
84°F
Updated 1:53 am
Feels Like 84°F
Humidity 42%
Wind N 0 mph
Barometer  29.98 in
Dew Point 59°F
Rialto CA weather - Clear - 29°C
Clear
29°C
Updated 1:53 am
Feels Like 29°C
Humidity 42%
Wind N 0 km/h
Barometer  101.5 kPa
Dew Point 15°C
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Rialto Weather Forecast

TODAY TONIGHT FRIDAY FRIDAY NIGHT SATURDAY SATURDAY NIGHT SUNDAY SUNDAY NIGHT MONDAY MONDAY NIGHT TUESDAY TUESDAY NIGHT
Rialto, CA Weather - Today Mostly Sunny Rialto, CA Weather - Tonight Mostly Clear Rialto, CA Weather - Friday Sunny Rialto, CA Weather - Friday Night Mostly Clear Rialto, CA Weather - Saturday Mostly Sunny Rialto, CA Weather - Saturday Night Mostly Clear Rialto, CA Weather - Sunday Mostly Sunny Rialto, CA Weather - Sunday Night Clear Rialto, CA Weather - Monday Mostly Sunny Rialto, CA Weather - Monday Night Clear Rialto, CA Weather - Tuesday Mostly Sunny Rialto, CA Weather - Tuesday Night Mostly Clear
Mostly Sunny Mostly Clear Sunny Mostly Clear Mostly Sunny Mostly Clear Mostly Sunny Clear Mostly Sunny Clear Mostly Sunny Mostly Clear
Hi: 105°FHi: 41°C
 Lo: 71°FLo: 22°C Hi: 98°FHi: 37°C
 Lo: 67°FLo: 19°C Hi: 90°FHi: 32°C
 Lo: 61°FLo: 16°C Hi: 87°FHi: 31°C
 Lo: 61°FLo: 16°C Hi: 87°FHi: 31°C
 Lo: 58°FLo: 14°C Hi: 85°FHi: 29°C
 Lo: 58°FLo: 14°C
POP = Probability of Precipitation.
Weather Outlook Updated: 1204 AM PDT Thu Sep 10 2026 Rialto, CA Weather - WeatherWorld.com

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Issued: 1040 PM PDT Wed Sep 9 2026

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...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES...

...UPDATED AVIATION DISCUSSION...

A slow cooling trend begins on Thursday as the upper ridge begins to weaken. However, this humid, tropical airmass will remain in place through Friday. Therefore, areas of major HeatRisk will continue through Thursday for the coastal basin and through Friday for the low deserts. By Saturday, an upper trough to the northwest...