Rialto Weather in September

September in Rialto averages 34°C (93°F) during the day and 17°C (63°F) at night. With only 4.6 mm (0.2 in) of rainfall expected on average, it's a largely dry month.

Rainfall in Rialto in September

Climate statistics over the past 30 years suggest around a single day of rain, with 4.6 mm (0.2 in) average for the month. On the rare occasion it rains, expect a brief, moderate shower rather than a heavy downpour.

Temperature in Rialto in September

September in Rialto brings very high temperatures, with highs of 34°C (93°F) and nights around 17°C (63°F). Sunshine and humidity can make it feel even warmer than the raw temperature suggests. Nights cool down to 17°C (63°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions.

Sunshine in Rialto in September

There are approximately 290 hours of sunshine this month, resulting in mostly clear days.

If you prefer dry days with pleasant temperatures, September may not be the ideal month to visit Rialto. Our weather planner can help you explore destinations with more pleasant weather conditions.

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• January
• February
• March
• April

• May
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• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Rialto's climate page.

Rialto Temperature in September

Min Temperature 17°C (63°F)  

Max Temperature 34°C (93°F)  

Chance of Rain 3%  

Precipitation 4.6 mm (0.2 in)  

Rainy days a single day  

Sunshine 290 hours *  

Percentage Sunshine *  

* Data from: Corona, the United States of America (31 KM, 19 Miles).

What to Wear in Rialto in September

Get ready for hot weather in September! Lightweight, breathable fabrics are your best friend during this month. Cotton and linen shirts, shorts, sundresses, and sandals will keep you comfortable. Light colors help reflect the heat, avoid wearing black. Almost no rain is expected, so no need to bring rain gear. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.

What To Do in Rialto in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

10/10

Cycling

8/10

Walking

8/10

Barbeque

10/10

Camping

10/10

Outdoor sports

8/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Rialto's climate page.

More climate data for Rialto

Temperature Rainfall Sunshine

See the full Rialto climate overview or explore weather in the United States of America.