BEIJING, June 30 (Reuters) - Chicago corn futures edged higher on Tuesday, while soybeans and wheat were nearly unchanged, as traders adjusted positions ahead of the U.S. Department of Agriculture's quarterly grain stocks report and monitored weather in the U.S. Midwest.

FUNDAMENTALS

* The most-active soybean contract on the Chicago Board of Trade (CBOT) Sv1 rose 0.02% to $11.39-1/4 a bushel by 0108 GMT, while corn Cv1 climbed 0.25% to $4.03 a bushel. Wheat Wv1 lost 0.04% to $5.79-1/2 a bushel.

* The USDA will release its quarterly grain stocks report later in the day, with market participants on average expecting the agency to lower its corn acreage estimate and raise its soybean planting estimate.

* Hot weather across much of the U.S. Midwest this week is being monitored, with temperatures expected to peak in the next few days, according to Commodity Weather Group. Showers and cooler temperatures after midweek are expected to limit crop stress.

* Soybeans and corn came under pressure from weaker crude oil prices, given their role in biofuel production, while wheat was weighed down by the U.S. Plains harvest and ample global supplies.

* In its weekly report on Monday, the USDA rated 67% of the U.S. corn crop and 65% of soybeans as good to excellent, each down one point from a week earlier and below expectations.

* Winter wheat ratings held steady at 26%, while harvest progress lagged forecasts at 48% complete versus expectations of 54%.

* Commodity funds were net sellers of CBOT corn, soy and wheat futures, traders said on Monday. CBOT/FUNDS

DATA/EVENTS (GMT)

0130 China NBS Manufacturing PMI Jun

0600 UK GDP QQ, YY Q1

0645 France CPI (EU Norm) Prelim YY, MM Jun

0645 France CPI Prelim YY, MM NSA Jun

0645 France Producer Prices YY May

0755 Germany Unemployment Chg, Rate SA Jun

1200 Germany CPI, HICP Prelim YY Jun

1400 US Consumer Confidence Jun