It is quite warm for this time of year in Otaru today.
The highest daytime temperature is predicted to be 5℃.
You have to be watch out for the snow on the roofs of buildings that can melt and slide down on a warm day like this.
You sometimes find the 「頭上落雪注意」 sign to alert the pedestrians for the danger in the street.
However, I don't think you have to watch your head very much in the evening when the temperatures go down rapidly.
The annual Otaru Snow Gleaming Festival begins from tomorrow. The hours of the festival is 17:00-21:00.
Measures against cold may be more important for you. Please don't forget portable body warmer with you if you come to see the Festival!