Possibly, although it is more likely to be used in the context of the weather.
August 24, 2016
Where Welsh uses the future tense with os here, the usual form in English is to use the present with the if-clause:
- If it is fine tomorrow, we'll go out somewhere - Os bydd hi'n braf yfory, byddwn ni'n mynd allan rhywle.
November 20, 2016