Simi Valley's winters are cool and mild, with temperatures ranging from just below freezing to the mid-20s Celsius. Spring brings a gradual warming trend, with temperatures rising steadily through March and April before reaching their peak in May. Summer is hot and dry, with June and July often seeing temperatures soar above 40 degrees Celsius, but August usually provides a slight respite. Autumn brings a return to more moderate conditions, with September experiencing a brief cool-down before October and November see temperatures drop again. Winters are once more chilly, although not as cold as during the peak winter months.