The soil is reasonably moist after the September rain.

9月的雨水之后，土壤适度湿润。

《柯林斯英汉双解大词典》

Most of India’s crucial rain is brought by the summer monsoon, which falls, with luck, in just a few weeks between June and September.

基本上印度最主要的降雨都是由夏季季风带来的。 即使在好的年节，这些雨水也只集中在六月和九月之间的一小段时间里。

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On September 20th they gave way and allowed around 1,000 monks, who had marched on the shrine through the pouring monsoon rain, to enter it.

9月20日，他们让开路允许大约1000名僧侣进入大金塔，这些僧侣们在如注的季雨中进入圣地大金塔。

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The Trent and Mersey Canal breached its banks at Dutton after heavy rain in September, leaving a hole the size of 12 double decker buses in the side.

BBC: Work starts to repair breached Trent and Mersey Canal

And on top of that, September usually starts having some rain and burning potential going down.

NPR: Western Wildfires Reach into Montana

This figure may now be lower: torrential rain in late September drove many refugees down from the mountains, where they were sheltering under plastic sheeting and tarpaulins, into nearby towns.

ECONOMIST: Getting ready for war