河南用英语怎么说天气是什么

"Henan" in English is "Henan." To ask about the weather in Henan in English, you would say "What is the weather like in Henan?"
Here are some example sentences and their translations:
"I heard the weather in Henan is very hot in the summer." (我听说河南夏天天气非常热。)
"I'm planning to visit Henan next month, what's the weather forecast?" (我打算下个月去河南玩，天气预报是什么？)
The name "Henan" comes from the Chinese characters "河" and "南", which literally mean "river" and "south" respectively. The province is located in central China and is named so because it is located south of the Yellow River.