The Chinese word for weather is
气候

qì hòu

Chinese Definition

weather
1. 名词. 天氣
Components
气
1. Variant of 氣
2. Variant of 乞
3. Variant of 餼
候
1. to reconnoitre; to scout
2. to observe; to survey
3. to wait for; to await
4. to respectfully await
5. to visit; to send one's respects to
6. to wait on; to attend to; to take care of
7. to forecast; to predict (by divination)
8. (historical) scout; lookout; vanguard
9. (historical) Alternative form of 堠 (fortress)
10. (historical) official
11. (historical) posthouse; station
12. (historical) pentad (ancient time unit composed of five days)
13. climate; season
14. omen; sign; portent
15. (TCM) to examine (pulse)
16. (TCM) medical sign and symptom
17. (dialectal) to pay for (a bill)

天氣
1. n. weather
鬼天氣 - damned weather
惡è劣天氣 - bad weather
極端天氣事件 - extreme weather event
如果天氣允許的話 - if the weather permits
注意雨雪天氣。 - Drive carefully in rain or snow.
天氣怎麽樣？ - How's the weather?
趁天氣好，快出去玩兒r 吧。 - While the weather's good, go outside and play.
這幾天 ^墨爾本的天氣還挺好。 - Melbourne has had pretty good weather over the past few days.
2. n. (literary) light and clear air
3. n. (literary) air
4. n. (literary) destiny; fate
5. n. (dialectal) the day (as an approximate time); time of the day
天氣還早呢。 - It's early in the day yet.
6. n. (dialectal) period of time
7. n. (Jin) hazy weather before rain
8. n. (Xining Mandarin) sun