Renton experiences a mild climate with moderate temperatures throughout the year. Winters are cool, with average temperatures ranging from 1-4°C in January and February, and occasional drops below -15°C. Spring brings gradual warming, with April's averages reaching up to 9°C and May's averages peaking at around 10°C. Summers are warm, with June and July averaging highs of 17-18°C, while September temperatures dip slightly before cooling off in autumn. Autumn is generally mild, with October's averages returning to around 8°C, followed by a slight chill in November, and another cool winter setting in.