SanJuan

Planning your day or preparing for a trip to San Juan? Here you will find the latest weather information, including up-to-date data, visual charts, and detailed forecasts.

The climate in San Juan can be described as warm and fairly arid, with a noticeable difference between seasons. Overall, the weather is favorable for travel: the city enjoys plenty of sunny days and an absence of extreme cold. This destination is perfect for those who prefer a dry climate and want to avoid high humidity.

Summers here are truly hot and sunny. In July and August, the average temperature stays around 27–28°C, while daytime highs often reach 35–36°C. Rainfall in the summer is exceptionally rare, with rain being almost entirely absent. Winter, by contrast, is mild and cool: average figures in January and December are around 11°C, making walks comfortable if you bring a light jacket.

A characteristic feature of the local weather is the uneven distribution of humidity across seasons, although overall precipitation remains low year-round. Most overcast days occur during the winter months and early spring, though even then, rain is usually neither prolonged nor heavy. Spring and autumn serve as pleasant transition periods with moderate warmth, ideal for sightseeing.

The temperature patterns in San Juan show significant contrasts throughout the year, offering travelers both hot summers and mild winters. The sweltering peak traditionally occurs in July and August, when the average temperature stays around 27–28°C. During these months, the daytime heat can be quite intense: maximums often reach 36°C or higher, which, combined with the lack of rain, creates a dry summer heat.

Winter months, in contrast, bring a pleasant chill, making the city comfortable for long walks. January and December are considered the coldest months, with averages around 11°C. At this time, nighttime temperatures can drop to 6°C, but during the day, the air warms up to a comfortable 16–17°C, allowing you to avoid harsh cold and enjoy the mild weather.

An important feature of the local climate is the significant temperature swing between day and night, especially noticeable in the summer season. While the sun heats the air to peak levels during the day, a welcome freshness arrives after sunset: the difference can be nearly 18 degrees (dropping from 36°C in the day to 19°C at night). This allows tourists to rest comfortably at night even after the hottest days.

Precipitation in San Juan is distributed very unevenly throughout the year, creating distinct dry and wet seasons. The summer period is exceptionally dry: in July and August, rain is almost entirely absent, with precipitation levels nearing zero millimeters. This time of year guarantees travelers clear weather without the need to carry an umbrella.

In other months, especially from November to March, the probability of precipitation increases. The "rainiest" period in terms of frequency is early spring: for example, March sees up to 12 days with precipitation, and January around 10. However, it’s worth noting that even in these months, rain intensity remains low (average volume is only about 4 mm), so it’s most often a brief drizzle or light rain rather than prolonged downpours. Snow is unlikely, as even in winter, temperatures rarely drop below +6°C.

Given San Juan's climate, your packing list will heavily depend on the season of your visit. Summers are hot and dry, with temperatures reaching 36°C, so from June to September, your wardrobe should consist of light clothing made from natural, breathable fabrics like cotton and linen. Be sure to pack sun protection: a wide-brimmed hat, high-quality sunglasses, and high-SPF sunscreen will be your main essentials, as there is almost no rain during this time.

The weather changes in winter and early spring: it becomes cooler, and the chance of precipitation increases. Average temperatures hover around 11–14°C, but can drop to 6°C at night, so we recommend layering your clothes. Bring sweaters, jeans, and a mid-season jacket that is easy to remove as it warms up. Also, from November to March, it’s a good idea to pack a compact umbrella or a light raincoat.

Regardless of the time of year, you will need comfortable, broken-in shoes for long walks while sightseeing. If you are traveling during the shoulder seasons, such as April or October, be prepared for temperature fluctuations throughout the day: even if it's warm during the day, keep a cozy sweater or windbreaker handy for evening strolls.