* Asia ex-Japan stocks off 1 pct on Fed rate hike expectations
* Weaker yen boosts Nikkei by 2.3 pct
* Europe also poised for lower start
* Fed hike bets for September, December rise after Yellen speech
* Dollar rally, Middle East output fears weigh on crude futures
By Nichola Saminather
SINGAPORE, Aug 29 (Reuters) - Most Asian share markets tumbled on Monday while the U.S. dollar added to gains made after Federal Reserve Chair Janet Yellen indicated a U.S. interest rate increase remains on the cards for this year.
European markets also looked set for a weak start, with financial spreadbetters expecting Germany's DAX to open down 0.7 percent, and the blue-chip Euro Stoxx 50 to begin the day 0.6 percent lower. British markets are closed for a holiday.
MSCI's broadest index of Asia-Pacific shares outside Japan extended losses to 1 percent.
Japan's Nikkei bucked the trend, closing 2.3 percent higher, the biggest one-day gain in three weeks, as the yen weakened against the resurgent dollar.
China's CSI 300 index and the Shanghai Composite slipped 0.2 percent. Hong Kong's Hang Seng shed 0.4 percent.
The case for a U.S. rate hike has strengthened in recent months, with a lot of new jobs being created, and economic growth looks likely to continue at a moderate pace, Yellen said in a speech at the Fed's annual monetary policy conference in Jackson Hole, Wyoming, on Friday.
While Yellen did not give guidance on what the central bank needs to see before raising rates, she said the Fed already thinks it is close to meeting its goals of maximum employment and stable prices. She described consumer spending as "solid" but noted that U.S. business investment was weak and exports hurt by a strong dollar.
Comments by the Fed's No. 2 policymaker, Vice Chair Stanley Fischer, following Yellen's speech also bolstered the case for a hike this year.
Asked on CNBC whether a rate hike in September and more than one policy tightening before year-end should be expected, Fischer said Yellen's comments were "consistent with answering yes" to both questions, albeit still data-dependent.
Among the first data to be scrutinized will be U.S. consumer confidence for August, due on Tuesday; productivity, manufacturing and construction figures on Thursday; and August non-farm payrolls data rounding out the week on Friday.
Global factory activity surveys will also be released on Thursday.
Traders have modestly raised expectations for U.S. rate increases this year, but remain cautious.
The odds of a hike in September rose to 33 percent following the comments, from 21 percent on Thursday, according to CME Group's FedWatch tool. Traders were pricing in a 59.1 percent chance of a hike in December, up from 51.8 percent on Thursday.