Rio Grande, Argentina experiences a temperate climate with distinct seasons. Winters are cool and mild, with temperatures ranging from -8°C to 12°C in May and June, and averaging around 1-3°C. Spring arrives in September, bringing temperatures up to 15°C on average, while autumn is similar to spring but slightly cooler. Summers are relatively warm, with temperatures occasionally rising above 20°C in December and January, but still mild overall, averaging around 11-12°C.