Is it permissible to delay fasting in expiation for breaking a oath until the heatwave is over?

Does Repentance Expiate False Oaths?

Expiation for Multiple Broken Oaths

If he said to someone: I asked you by Allah not to do such and such, is what he said regarded as an oath?

Swearing an oath in words that do not represent an oath, but are intended as such

What Happens when You Say Wallahi Inshallah?

He vowed that he would not speak to his sisters

He vowed to donate two months’ salary; is it permissible to give that amount over several months?

He swore that if he did such and such, he would die a disbeliever, then he did that thing, then he died, so has he died a disbeliever?

Saying “Allah is my witness that I will not do such and such” – is it an oath?