1
: not able to be changed or damaged by the effects of the sun, wind, rain, etc.
The material is weatherproof and will not rot from moisture.
a weatherproof electrical outlet
2
: able to protect someone or something from the effects of the sun, wind, rain, etc.
a weatherproof coat
weatherproofs; weatherproofed; weatherproofing
: to make (something) protected against the effects of the sun, wind, rain, etc. : to make (something) weatherproof
He weatherproofed his shoes.
a weatherproofed cabin
Cite this Entry
“Weatherproof.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/weatherproof. Accessed 15 Apr. 2026.
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