The Australian share market is expected to start the week lower amid rising tensions between the US and Iran.

The SPI200 futures contract was down 26 points, or 0.39 per cent, at 6,616.0 at 0805 AEST on Monday, suggesting an early decline for the benchmark S&P/ASX200.

Growing concerns over the relationship between the US and Iran weighed on Wall Street at the close of the week with the Dow Jones, NASDAQ and S&P 500 all in the red.

The Aussie dollar is buying 70.45 US cents from 70.68 US cents on Thursday.