You might take the bus on the many make days a year there’s a heat advisory to stay indoors In my state (USA). Plus often when it rains here, it’s not a little rainy. It goes from sunny to pouring in 15 minutes, torrential downpour for 20 minutes and right back to sunny. Pretty unpredictable. But mostly I don’t think it’s nuts to take the bus to class when there’s time pressure and then walk home when there’s not.