Definition of be set fair in English:

be set fair

phrase

British
  • (of the weather) be fine and likely to stay fine for a time.

    ‘the weather is set fair for this weekend's carnival’
    figurative ‘conditions were set fair for stable political and economic development’
    • ‘The course was generally in good condition and the day was set fair for a fine competition.’
    • ‘The weather is set fair for this weekend's Radcliffe carnival.’
    • ‘Anyway - must be positive - it's a nice day again and the weather forecast is set fair right through until after the weekend, so walking should be more of a pleasure than a chore.’