Hi Jack Myers,
I think you can learn the LPC54018 data transfer to the cloud or the web at first. Eg, you can learn the SDK aws which will send data to the amazon cloud, the code can be download it from this link:
https://mcuxpresso.nxp.com/en/select
Folder: SDK_2.5.0_LPC54018-IoT-Module\boards\lpc54018iotmodule\aws_examples
Then how to get the weather information from a web api, and send it to the cloud is totally the top side software case, LPC side just need to know how to get the data and send the data to the cloud or the ethernet.
Wish it helps you!
Have a great day,
Kerry
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