Three brothers stop along the Santa Cruz River Trail under the Speedway bridge to check out a rare sight — water in Santa Cruz River — thanks to a monsoon burst on the south side of Tucson.

Ron Medvescek / Arizona Daily Star

Southern Arizona is off to a good start this monsoon, with rain falling daily since it arrived last Thursday.

In the Tucson valley and surrounding mountains, rain has been recorded since Saturday in most areas, said Jeff Davis, a National Weather Service meteorologist.

The Tucson International Airport at this time of year normally has 0.39 of an inch, but as of Sunday had recorded 0.25 of an inch, a bit below normal.

“Mount Lemmon is doing very well. Since July 3, the very top of the mountain has received 2.56 inches, and Oracle Ridge has received 3.58 inches. Near the Palisades Ranger Station, 3.74 inches of rain has fallen,” Davis said.

More than 1 inch of rain has fallen in areas from the east side to Vail and Corona de Tucson on up to the north side, including Oro Valley and the East Ina Road and North First Avenue area, which has recorded 2.20 inches of rain since July 3.

Monday’s storms missed most of the Tucson metro area, hitting the southeast and south of the city hardest.

Heavy rain in Nogales, Sonora, flooded the DeConcini Port of Entry at the international border Monday afternoon.

More than 2 inches of rain fell in Nogales, Sonora, and the flooding began about 1 p.m. at the downtown DeConcini port, authorities said.

“Pedestrian traffic was diverted to the Morley Gate, and vehicles were diverted to the Mariposa Port of Entry,” said Edith Serrano, a spokeswoman for U.S. Customs and Border Protection. Cleanup of the port began shortly before 5 p.m. before it was reopened to traffic.

The Santa Cruz River was flowing, but there was no major flooding in the city or county, authorities said.

About 2 inches of rain was reported in the Corona de Tucson area southeast of Tucson, flooding several roads.

Meanwhile in Marana, gusty winds caused drywall to fall in a breezeway at a Department of Economic Security office at a northwest-side shopping plaza on West Ina Road near North Thornydale Road. Four people were struck by the debris, and three were treated for minor injuries. The fourth person was not injured, according to the Northwest Fire/Rescue District.

Rain is expected to continue today, Thursday and Friday, with a 50 percent chance of thunderstorms this weekend.

Contact reporter Carmen Duarte at or 573-4104.