Oceanside experiences mild winters with temperatures ranging from just below freezing to around 12°C, averaging around 2-7°C. In spring, temperatures gradually warm up, reaching averages of 16°C in May and 23°C in June, with occasional highs above 30°C. Summer months bring stable warmth, with July and August averaging around 24-25°C, while September cools slightly to around 22°C. Autumn is characterized by a decline in temperature, returning to winter-like conditions, but still warmer than the coldest winter months. By December, temperatures drop again, averaging around 6°C, with occasional lows below freezing.