creating a weather station

can anyone give me the code for program (and wiring diagram) to build a mini-weather station

I only have the ff materials:

Arduino UNO
BMP 280 sensor
128x64 OLED
8 pieces jumper wires
400 pts breadboard

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BMP 280 sensor

I'm sure adafruit has a library and sample code for that.

How on earth did you end up with materials like that before having a circuit diagram and maybe some example code to try? You'd better get off your arse and doing some work for yourself, start googling

Google arduino bmp280
Arduino 128x64
When you use arduino in the search you get better results