Indian summer

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A 29-year-old diabetic man, while fishing in the West Indian summer sun, suddenly felt weak and nauseated, and started to vomit.
一名29岁的糖尿病人，夏日阳光下在西印度捕鱼，突然感到恶心软弱，并开始呕吐。
Meanwhile, experts at IMD Pune said the hot summer may not have any impact on this year's monsoon since the land-ocean temperature difference isn't high as the Indian Ocean too is warming.
与此同时，在普那国际管理发展研究院的专家表示，炎热的夏季或许不会对今年的季风产生影响，因为印度洋也在变暖，陆地-海洋温差并不大。
Summer rainfall anomalies in North China relates to the Indian summer monsoon, the South sea monsoon, Sub-tropical anticyclone, South Asian anticyclone and cold air anomaly.
华北地区夏季降水异常与印度西南季风、南海东南季风、副热带高压、南亚高压及冷空气异常都密切相关。

This is the third successive summer of big anti-Indian protests.
ECONOMIST: Banyan
Indian terrorists this summer broke into underprotected networks to e-mail a warning prior to bomb blasts in Delhi and Ahmedabad.
FORBES: Magazine Article
This is, it turns out, a perfect place for nurturing grapes that respond to warm, dry autumns--the Maremma is often glowing with an Indian summer at harvesttime.
FORBES: The Other Tuscany

(WEATHER) a period of calm, warm weather that sometimes happens in the early autumn
(SUCCESSFUL TIME) a pleasant or successful time nearly at the end of someone's life, job, or other period

You can refer to a period of unusually warm and sunny weather during the fall as an Indian summer.