In Japan, OSE rubber futures closed 2 percent higher week-on-week in active trading, with September-delivery contracts closing at $1.58 (Yen 212.3), while Singapore's SICOM closed "marginally lower" at $102.32 USD ($135.7 SGD) for July-delivery contracts.
China's SHFE and INE futures faced new selling pressures after opening from three-day holidays and closed 0.4-percent lower.
According to JPX, weather conditions have been "dry and warm" in most producing areas, including Yunnan, China; Thailand; and Malaysia.
This follows a Bloomberg report earlier in May indicating that rubber production may be affected in China due to a drought that "has persisted for more than a month."
As weather conditions affect supply, JPX expects rubber prices to remain steady in response to "optimistic economic recovery and car sales improvement in China."