(For a Reuters live blog on U.S., UK and European stock

markets, click or type LIVE/ in a news window)

*

Nonfarm payrolls for August due at 8:30 a.m. ET

*

Broadcom ( AVGO ) tumbles after downbeat Q4 revenue forecast

*

Mobileye falls after report Intel ( INTC ) exploring stake sale

*

Futures off: Dow 0.36%, S&P 500 0.66%, Nasdaq 1.19%

(Updated at 06:56 a.m. ET/1056 GMT)

By Johann M Cherian and Purvi Agarwal

Sept 6 (Reuters) - U.S. stock index futures fell on

Friday as caution prevailed ahead of a key jobs data report that

could be pivotal when the Federal Reserve decides on the size of

its interest rate cut that is expected later this month.

The August nonfarm payrolls figure due at 8:30 a.m. ET is

the final crucial labor market data before the U.S. central

bank's September meeting and is expected to show a 160,000 rise

in jobs, up from 114,000 in July. The unemployment rate is

forecast to ease to 4.2% in August, from 4.3% in the previous

month.

"The key question of course is how the Fed is going to react

after today's labor market data ... a 50-bps cut could be seen

as an implicit admission of the Fed being behind the curve,"

Teeuwe Mevissen, senior macro strategist at Rabobank, said.

The labor market has come under scrutiny after an unexpected

rise in the jobless rate sparked recession fears and sent the

tech-heavy Nasdaq down more than 10% into correction territory

and led to a selloff in global markets nearly a month ago.

Traders' bets for a 25-basis point interest rate cut in

September now stand at 59%, according to the CME Group's

FedWatch Tool, while those for a 50-bps reduction have risen to

41% from 30% a week earlier.

Markets will also parse remarks from New York Fed President

John Williams and Fed Governor Christopher Waller for their

insights on the data and consequent central bank policy.

At 06:56 a.m. ET, Dow E-minis were down 151 points,

or 0.36%, S&P 500 E-minis were down 37 points, or 0.66%,

and Nasdaq 100 E-minis were down 225.75 points, or

1.19%.

The S&P 500 and the blue-chip Dow hit a more

than three-week low on Thursday after a set of mixed economic

data fueled uncertainty on the pace of monetary policy easing.

September has been historically weak for U.S. equities, with

the benchmark S&P 500 down about 1.2% for the month on average

since 1928.

The S&P 500 is on track for a weekly drop of more than 2%,

its steepest decline in nearly five months, led by a near 5%

drop in technology stocks.

Broadcom ( AVGO ) slid 8.7% after the chipmaker forecast

fourth-quarter revenue slightly below estimates, hurt by

sluggish spending in its broadband segment.

Other chip stocks such as Nvidia ( NVDA ) and Marvell

Technology ( MRVL ) dropped over 1.6% each, while Advanced Micro

Devices ( AMD ) shed 1%. The Philadelphia SE Semiconductor index

is set for its biggest weekly drop in more than a month.

Super Micro Computer ( SMCI ) dropped 2.9% after brokerage

J.P.Morgan downgraded the AI server maker's shares to "neutral"

from "overweight".

Mobileye Global ( MBLY ) fell 4.6% after a report that top

shareholder Intel ( INTC ) is exploring a sale of part of its

stake in the automotive tech firm.

UiPath ( PATH ) jumped 9% after the enterprise automation

and AI software company raised its annual revenue forecast.