Weather in San Juan

Planning your day in San Juan or just curious about the weather there? In this section, you will find the most up-to-date information on weather conditions, as well as detailed forecasts and useful charts.

San Juan, located in Puerto Rico, boasts a tropical climate that ensures warm weather year-round. Temperature fluctuations throughout the year are minimal, making it an attractive destination for those seeking constant warmth. The average annual temperature stays at a comfortable level, rarely dropping below 22°C even in the "coolest" months and reaching a pleasant 28-30°C during the warmest periods.

Although San Juan does not have distinct seasons in the traditional sense, one can distinguish periods with slightly different rainfall amounts. From January to April and in December, the lowest rainfall is observed, about 2 mm per month. From May to November, precipitation and the number of rainy days increase slightly, peaking in September (6 mm) and October (5 mm) with 24-25 rainy days. It is important to note that even in these months, total rainfall remains relatively low, suggesting frequent but usually short-lived and not very intense showers.

In general, the weather in San Juan is characterized by stability and warmth. Sunny days prevail, and a light sea breeze often softens the daytime heat. Travellers should be prepared for high humidity, typical of a tropical climate, and periodic short rains, especially between May and November.

San Juan experiences a surprisingly stable and warm temperature regime throughout the year. The annual range of average temperatures is very narrow: from 24.4°C in February, which is the coolest month, to 27.7°C in August, traditionally the hottest month. Maximum daytime temperatures in August can reach 30.3°C, while minimum nighttime temperatures in February drop to 21.8°C. This consistency makes San Juan an attractive destination at any time of the year for warmth lovers.

The summer months, from June to September, are characterized as the hottest. Average temperatures during this period range from 27.4°C to 27.7°C. During the day, the thermometer often rises to 30.1°C - 30.3°C, creating real tropical heat, which is often accompanied by high humidity. Nights also remain very warm, with temperatures rarely dropping below 24.6°C - 25.1°C, which is ideal for evening walks and enjoying the breeze.

The winter period in San Juan, from December to February, brings only a slight and very mild "cooling". Average monthly temperatures during these months vary from 24.4°C to 25.1°C. Daytime is usually very pleasant and warm, with maximum temperatures around 27.0°C - 27.6°C, and nights remain comfortable with minimum values in the range of 21.8°C - 22.6°C. Daily temperature fluctuations throughout the year are small, averaging about 5-6°C between daily peaks and nightly lows, ensuring comfortable conditions around the clock.

When planning a trip to San Juan, it is worth considering that precipitation here is a year-round phenomenon, although its character and frequency change from month to month. Although the city does not experience extreme rainy or dry seasons, understanding typical rainfall patterns will help you better prepare for your journey. Of course, there is no snow here; we are talking exclusively about rain.

The period from December to April can be considered relatively drier. In January, February, and March, only about 2 mm of precipitation falls monthly, and in December, this figure is also low. April is characterized by a slight increase in precipitation to 3 mm. The number of days with precipitation in these months ranges from 15 to 16 (up to 18 in December), which means that although rains do happen, they are usually short and not too intense showers or drizzle that should not significantly disrupt your plans.

Starting in May, the amount of precipitation and the frequency of rainy days gradually increase, reaching a peak in autumn. September is the wettest month, with an average of 6 mm of precipitation, and it rains for about 25 days out of 30. October follows with 5 mm of precipitation and 24 rainy days. In the summer and autumn months (from June to November), rains most often represent typical tropical downpours: they can be quite heavy but usually pass quickly, bringing freshness. For example, in July and August, despite 22 rainy days, the total amount of precipitation is 3-4 mm, which also indicates the short-term nature of most rains during this period.

When packing your suitcase for a trip to San Juan, remember that warm tropical weather awaits you all year round. The basis of your wardrobe should be light, breathable clothing made from natural fabrics such as cotton or linen: T-shirts, shorts, skirts, sundresses, and, of course, swimwear. Don't forget sunscreen with high SPF, sunglasses, and headwear, such as a wide-brimmed hat or cap, to protect against the bright Caribbean sun, especially if you plan to spend a lot of time outdoors.

Although there are no sharp seasonal changes in San Juan, the number of rainy days increases slightly from May to November. Despite the fact that precipitation usually comes in the form of short tropical downpours, it is worth taking a light raincoat or a compact umbrella. Given that the average temperature even in the "cool" months does not drop below 22°C, you will hardly need warm clothes. However, a light cardigan or shawl may be useful on cool evenings or for visiting air-conditioned places. Most importantly, bring comfortable shoes for walking along the cobblestone streets of Old San Juan and exploring the numerous attractions.