May in Rio de Janeiro typically marks the transition from the warmer, wetter summer months to the cooler, drier winter season. Average temperatures during this period generally range from the low 20s Celsius (low 70s Fahrenheit) at night to the high 20s Celsius (low 80s Fahrenheit) during the day. Rainfall decreases significantly compared to the preceding months, though occasional showers are still possible. Ocean temperatures remain pleasant, making swimming and other water activities enjoyable.
Understanding the climatic conditions prevalent during this specific time of year is crucial for travelers planning a visit. Packing appropriately for fluctuating temperatures and occasional rain becomes essential. The shift to drier weather also influences the types of outdoor activities that can be comfortably enjoyed. Historically, May has represented a shoulder season, offering a balance between pleasant weather and fewer crowds compared to peak summer months. This can translate to more competitive accommodation rates and greater availability for popular attractions.