There're arguments that during the Chibi battle, Zhou Yu and Huang Gai won it with the burning of Cao Cao's fleet, nothing much to do with Zhuge Liang. People who lived in the region most of their lives should know the weather best. There wasn't need for Zhuge to forecast the weather or "borrow the wind."
Herein lies the problem. Every Jiangdong native would agree that then wasn't the season for the south-east wind. Cao Cao with his military experience was always on alert against arson attacks and brought along his weatherman to assure him that then wasn't the season for the south-east wind. That's why he dared to confidently chain-link his fleet. Anamolies in usual weather during any season happens now and then occasionally, and always take even long-time natives by surprise.
Question is, if it was Zhuge Liang who correctly forecast it, how did he do it? He was the only known Taoist master there and then. Those days, a Taoism were very different from nowadays. It was the understanding of the way of nature between heaven and earth, and man's place in it during his lifetime.
In ancient original Taoism untainted with superstition and idol worshipping, reading the stars were always mentioned. 所谓的夜观星像。Is it art and science or just charlatan myth? There's an art and science to it that even modern meterologists use it, with better precision equipment of course. Even animals use it as part of their natural instincts, like birds and cats never got caught drenched in sudden rain.
Reading cloud movements in daylight is common, even most laymen had some rudimentary knowledge of that. However, how to read it at night? Basically, it's using the stars to read it. The stars are stationary and illuminary if unblocked by the clouds. The clouds may be stationary, moving or simply not there. Reading the skies at night, in ancient times without scientific equipment, was especially important. It could foretell weather in the next few days instead of just the next few hours.
Back to the Chibi battleground, even if Zhuge Liang correctly forecast it, it'd be just a stroke of luck that he happened to see it coming. If the wind wasn't coming, he'd probably have to work out another way with Zhou Yu how to handle Cao Cao.