According to the Dictionary of Newfoundland English, also spelled mausey, mausy, mawzy, and mosey. "Of the weather, damp, foggy, misty, or close, sometimes with very light rain or condensation on objects and a cool, gentle wind off the sea." Also see "caplin (scull) weather."
Usages: 1968 Keating: 'Breeze comin' from duh suddard,' the skipper said. 'Always blows up mauzy weather.' And the fog did indeed roll over the deep as the warm south wind hit the chill air of the bank.
1969 Horwood: The Caplin Scull is not just a phenomenon of nature, but also a period of the year, and even a special kind of weather—'mausy' weather, with high humidity, frequent fogs or drizzles, easterly winds.