A man traverses through the rain in his poncho along South Osborne Avenue near 22nd Street following a monsoon storm that dumped rain on Tucson's downtown and south side on Aug. 3, 2017, in Tucson, Ariz.

 Mike Christy / Arizona Daily Star

A storm system developing south and west of Tucson will bring cooler temperatures and a high chance of rain today. 

Scattered showers are likely after 11 a.m. and will continue throughout the day, with the chance of precipitation increasing to 80 percent tonight. 

Showers are expected to last through Friday morning across southeast Arizona, with rain totals estimated to reach .10 to 0.25 inches. 

High: 65

Low: 48

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