I have a smartphone, top of the line, and it only tells me weather recorded at nearest weather station, and current barometeric pressure, and battery temperature.
If you need a weather station in your car you need the following
1. Thermometer + hygrometer = 200-300rs for analog
2. Barometer - This can be expensive
Or you can buy a 5000-6000 watch.
Without any computer for recording, you have to keep looking at the readings.
For example, we went to Govind Dham.
At 3100mts pressure was 695mbar
It was nice and sunny.
Then clouds came. Fear of rain. But pressure did not drop. So we knew no rain. At night pressure dropped by 30, so we knew rain.
On my smartphone I could have used an app to tell me this, but its too much noise while gaining altitude, as it keeps saying rain possible.
If you really want a basic weather station, read on how temparature, RH and Pressure interact to create rainy conditions.
If you want something advanced, you need to buy temp sensor, pressure sensor and RH sensor.
Then you need to pair them with an IC to create readings, and then finally, use a serial port to connect to a computer. You can write a driver for your device to log readings, and then write a software program to predict weather.
Alternatively you can spend 35-50 USD and buy a weather station. Search on
Electronics, Cars, Fashion, Collectibles, Coupons and More Online Shopping | eBay
It will predict weather, store 24 hr graphs, and tell you actual stuff also.
for exact search, go to
Electronics, Cars, Fashion, Collectibles, Coupons and More Online Shopping | eBay, type weather station, then sort by "price and shipping lowest first" (chose your city in India as area to deliver), and then simply add price 35$+