By Swati Pandey and Charlotte Greenfield
SYDNEY/WELLINGTON, Sept 29 (Reuters) - The Australian dollar climbed to a three-week high on Thursday, making its fourth straight day of gains with help from a surge in oil prices after the Organization of the Petroleum Exporting Countries agreed to trim output. gave the Australia dollar AUD=D4 a boost as the country is a major exporter of natural resources, though it is a net importer of oil.
The Aussie ran past key chart resistance at 77 U.S. cents to hit its highest since Sept. 8 but soon settled back to $0.7694, standing virtually unchanged from the last close.
The Aussie has breached 77 cents several times in the past couple of months, but failed to hold above it.
It has added about 1 percent this week and is set to end the month higher, although traders expect limited future gains.
"We expect further upside is capped until either commodity markets break significantly higher or the Reserve Bank of Australia signals that the next move for rates is higher," ANZ said in a note to clients.
"We think the RBA is still a long way from switching to a tightening bias."
Governor Philip Lowe gave an upbeat assessment on the economy earlier this month, but left the door slightly ajar for more cuts. The central bank is expected to keep its policy rate at 1.5 percent at a policy meeting next week. Aussie climbed to a 1-1/2 month high of NZ$1.0581 against the New Zealand dollar AUDNZD=R , after two straight day of gains.
The New Zealand dollar NZD=D4 climbed to $0.7272, and off a low of $0.7234, in line with other commodity-related currencies.
"The Canadian dollar CAD= was going up and the Aussie was going up and so we rose on the coat tails of that," said Jason Wong, currency strategist at BNZ.
Traders said the rebound in oil could make it attractive to short the kiwi against the Canadian dollar NZDCAD=R , particularly as the New Zealand currency hit a 34-year high against its Canadian counterpart.
"With an overvalued Kiwi and under priced oil, there is potential for NZD/CAD to roll over," said Matt Simpson, senior market analyst at ThinkMarkets.
"For a sustainable, bearish move to unfold we'd require an interest rate cut here with a continued easing bias, combined with rising oil prices."
The Reserve Bank of New Zealand has signalled rates will likely be cut again, possibly in November.
New Zealand government bonds 0#NZTSY= slipped, sending yields 2 basis points higher.
Australian government bond futures were mixed, with the three-year bond contract YTTc1 unchanged at 98.48. The 10-year contract YTCc1 fell 2 ticks to 98.025. (Editing by Simon Cameron-Moore)