Undated (AP) _ Thunderstorms poured torrents of rain on southern Texas today, flooding streets and streams, while scattered showers fell from eastern Illinois to western New England.

Two people, a 29-year-old man and a 12-year-old girl, were reported missing and feared drowned in raging creeks in the San Antonio area; a body recovered today was believed to be that of the girl. The deaths Thursday of two men in a three-vehicle accident in southeast Texas and of one woman in an Oklahoma accident were blamed on the weather.

An isolated thunderstorm early today dumped 4 inches of rain in three hours at Lake Houston. Heavy rain fell in the Houston-Beaumont-Port Arthur area, including 6.09 inches at Beaumont and 7.79 inches at Bevil Oaks, 10 miles northeast of Beaumont.

Flood and flash flood watches covered a wide area of southeastern and south-central Texas, including Houston, San Antonio and Austin.

Forecasters said the ground was already ''super saturated'' from earlier heavy rainfall and predicted more showers and thundershowers, with some producing heavy rainfall, to continue through tonight.

About 60 people, including 40 children trapped in a church, had to be evacuated Thursday from Leon Springs, near San Antonio, after rising water from rain-gorged creeks swirled into the town.

A Texas state trooper was stranded atop his car on flooded Interstate 10 in San Antonio and had to be rescued by a television station helicopter.

The intense scattered showers around San Antonio helped break the record for any 30-day period of rainfall; 18.41 inches of rain was recorded from May 13 to June 11, eclipsing the old record of 17.82 inches set from Aug. 29 to Sept. 27, 1946.

Light showers lingered over the Rocky Mountains.

In Chicago, thunderstorms poured rain at a rate of 1 inch per hour, flooding streets. An apparent funnel cloud touched down in the suburb of Woodridge, where falling trees tore down power lines and slightly damaged two buildings.

In suburban Elgin and Glen Ellyn, about 6,000 people were reported temporarily without power.

In eastern Iowa, thunderstorm winds downed trees and flung dime-sized hail at Conrad.

There were no reports of injuries.

Today's forecast called for showers over New England and northwestern Washington state; showers and occasional thunderstorms from the lower Great Lakes to northern Florida, the Ohio Valley to the middle Gulf Coast, westward across the lower Mississippi Valley, southeastern Oklahoma and through central Texas.

High temperatures today were expected to reach the upper 60s or 70s across most of New England, the northern two-thirds of the Applachians and along the Pacific Coast; mid-90s to near 110 degrees in the desert Southwest; 80s to low 90s elsewhere.

Temperatures around the nation at 2 a.m. EDT ranged from 43 degrees at Yellowstone Park, Wyo., to 92 degrees at Phoenix, Ariz.

Other reports:

-East: Atlanta 71 hazy; Boston 62 rain; Buffalo 71 showery; Charleston, S.C. 73 fair; Cincinnati 76 cloudy; Cleveland 64 cloudy; Detroit 70 foggy; Miami 81 partly cloudy; New York 64 cloudy; Philadelphia 66 cloudy; Pittsburgh 70 cloudy; Portland, Maine 63 rain; Washington 68 cloudy.

-Central: Bismarck 59 fair; Chicago 70 foggy; Dallas-Fort Worth 74 rain; Denver 62 fair; Des Moines 72 fair; Indianapolis 70 showery; Kansas City 72 fair; Minneapolis-St. Paul 71 partly cloudy; Nashville 74 cloudy; New Orleans 77 cloudy; St. Louis 75 cloudy.

-West: Albuquerque 68 fair; Anchorage 51 cloudy; Las Vegas 83 fair; Los Angeles 60 cloudy; Phoenix 92 fair; Salt Lake City 66 fair; San Diego 62 cloudy; San Francisco 54 fair; Seattle 56 windy.

-Canada: Montreal 54 cloudy.