The Cairngorms, Glen Coe and Lochaber have been among upland areas to see wintry showers.
Strong north-westerly winds have brought colder air from the Arctic across the UK.
BBC Weather said snow over Scottish mountains was not uncommon in September during the transition into the colder winter months.
Nights are expected to feel chilly and rural areas could have ground frost.
BBC Weather said by Friday and into the weekend, there would be another change in wind direction to a south-westerly.
It added that this wind direction tended to bring in more seasonally average temperatures - around 16 to 20C for mid-September.
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