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Illinois Extension reports that July rainfall was generally adequate while August rainfall was below normal across most of the state, with less than an inch in much of southern Illinois. Severe drought was noted in parts of central and southern Illinois as of September 9, and late-planted soybeans in lighter soils may have run short of water during pod-filling.
Temperatures turned cooler from late August into September.
Dry August weather during pod-fill can cut soybean seed size and yield in the drier areas of Illinois, supporting soybean and soybean meal prices. The effect is limited to parts of the state so far.
farmdoc.illinois.eduGiovani Preza Fontes2025年9月12日在过去 1,079 次看涨的天气事件之后，大豆 在 5 个交易日内中位数变动 +0.3%（54% 上涨；中间一半区间为 -1.4% 至 +2.0%），20 个交易日内为 +0.9%。
在过去 453 次看涨的天气事件之后，豆粕 在 5 个交易日内中位数变动 +0.5%（55% 上涨；中间一半区间为 -1.6% 至 +2.7%），20 个交易日内为 +0.5%。
各商品基准价相对事件前最后收盘价的变动。历史数据汇总同类过往事件；仅描述已发生的情况，不代表未来走势。不构成投资建议。
