Here are some websites you may want to have a look.

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AFCD: https://www.afcd.gov.hk/english/index.html

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Enjoy Hiking (AFCD): http://hiking.gov.hk/

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Hong Kong Observatory (for weather): http://www.hko.gov.hk/en/index.html

 

-->Hiking Trail Weather: https://www.hko.gov.hk/en/103461/Hong-Kong-Hiking-Trail-Weather-Service

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Mobile Network Coverage: https://www.ofca.gov.hk/en/consumer_focus/mobile_telecom/country_parks/coverage_survey/digital_map/index.html