The Rand traded at 18.08 against the Dollar, down roughly 0.4% from Friday's close.
The greenback edged up against a basket of currencies on heightened safe-haven demand, while oil prices rose about 1.4% as investors anxiously awaited Iran's response.
Market participants are bracing for further oil price hikes amid fears that an Iranian retaliation may include the closure of the Strait of Hormuz, through which roughly a fifth of global crude supply flows.
SA's economic calendar will be relatively quiet on Monday and "market moves will be driven by geopolitical events," said Andre Cilliers, Currency Strategist at TreasuryONE.
"Prices are likely to remain fairly volatile in the short term as traders await Iran's response to the US attacks," said Cilliers.
Domestically, investors will look to leading indicator and producer inflation data due on Tuesday and Thursday respectively to gauge the health of Africa's most industrialised economy.
SA's benchmark 2035 government bond was weaker in early deals, as the yield rose 2.5 basis points to 10.075%.
--Reuters--