A sunny spell is a period when the cloud breaks and the sun shows. Sunny spells and showers, a long sunny spell, brief sunny spells.
It is forecasters' language, and sunny spells with scattered showers is the most British weather sentence there is. A spell is longer than an interval, which is the finer distinction the forecast makes.
1nounsunny spellA period when the cloud breaks and the sun shows.
“A sunny spell in the afternoon dried the pitch enough to play.”
sunny spell is a period.
Practised in Weather & Seasons