Best months
January, March, and April
Warmest month
September, 32°C
Wettest month
November, 213 mm
San Juan weather by month
Average daily high and low, total rainfall and days with at least 2.5 mm of rain.
| Month | High / low | Rain | Verdict |
|---|---|---|---|
| January | 29°C / 21°C | 116 mm · 10 days | Wet |
| February | 29°C / 21°C | 107 mm · 10 days | Wet |
| March | 29°C / 22°C | 102 mm · 8 days | Fair |
| April | 30°C / 23°C | 126 mm · 8 days | Fair |
| May | 31°C / 24°C | 194 mm · 11 days | Wet |
| June | 32°C / 25°C | 128 mm · 8 days | Hot |
| July | 32°C / 25°C | 197 mm · 13 days | Hot |
| August | 32°C / 25°C | 211 mm · 13 days | Hot |
| September | 32°C / 25°C | 185 mm · 12 days | Hot |
| October | 32°C / 24°C | 169 mm · 13 days | Hot |
| November | 31°C / 23°C | 213 mm · 13 days | Wet |
| December | 29°C / 22°C | 161 mm · 12 days | Wet |
San Juan by season
Spring
Spring brings warm temperatures with lower humidity and minimal rainfall, making it ideal for exploring. The tourist crowds thin out after Easter, creating a perfect balance of good weather and manageable visitor numbers.
- + Pleasant temperatures (mid-80s°F)
- + Lower humidity than summer
- + Fewer crowds than winter peak season
- − Higher prices around Easter week
- − Occasional brief showers
Summer
Summer is hot, humid, and rainy season, with frequent afternoon thunderstorms. While temperatures soar, this is when you'll find the best hotel deals and vibrant local festivals.
- + Lowest hotel rates of the year
- + Warm ocean water perfect for swimming
- + Local festivals like San Juan Bautista Day
- − High humidity and temperatures (90°F+)
- − Frequent afternoon rain showers
Autumn
Autumn begins with continued heat and humidity, transitioning to milder conditions by November. This is hurricane season, so travelers should monitor weather closely, especially September-October.
- + Shoulder season prices
- + Warm ocean temperatures
- + Fewer tourists until Thanksgiving
- − Peak of hurricane season
- − Some businesses close for maintenance
Winter
Winter is peak tourist season with near-perfect weather—warm days, cool evenings, and minimal rain. This is the most popular and expensive time to visit, especially around holidays.
- + Ideal weather conditions (low 80s°F)
- + Minimal rainfall
- + All attractions and tours operating at full capacity
- − Highest hotel rates and crowds
- − Need reservations for everything
San Juan month by month
San Juan in January
WetIn January, San Juan averages highs of 29°C and lows of 21°C, with about 10 rainy days and 116 mm of rain. It is one of the wetter months, so keep indoor plans in reserve.
San Juan in February
WetIn February, San Juan averages highs of 29°C and lows of 21°C, with about 10 rainy days and 107 mm of rain. It is one of the wetter months, so keep indoor plans in reserve.
San Juan in March
FairIn March, San Juan averages highs of 29°C and lows of 22°C, with about 8 rainy days and 102 mm of rain. Expect mixed weather, with comfortable spells.
San Juan in April
FairIn April, San Juan averages highs of 30°C and lows of 23°C, with about 8 rainy days and 126 mm of rain. Expect mixed weather, with comfortable spells.
San Juan in May
WetIn May, San Juan averages highs of 31°C and lows of 24°C, with about 11 rainy days and 194 mm of rain. It is one of the wetter months, so keep indoor plans in reserve.
San Juan in June
HotIn June, San Juan averages highs of 32°C and lows of 25°C, with about 8 rainy days and 128 mm of rain. It is hot, so plan sightseeing for mornings and evenings.
San Juan in July
HotIn July, San Juan averages highs of 32°C and lows of 25°C, with about 13 rainy days and 197 mm of rain. It is hot, so plan sightseeing for mornings and evenings.
San Juan in August
HotIn August, San Juan averages highs of 32°C and lows of 25°C, with about 13 rainy days and 211 mm of rain. It is hot, so plan sightseeing for mornings and evenings.
San Juan in September
HotIn September, San Juan averages highs of 32°C and lows of 25°C, with about 12 rainy days and 185 mm of rain. It is hot, so plan sightseeing for mornings and evenings.
San Juan in October
HotIn October, San Juan averages highs of 32°C and lows of 24°C, with about 13 rainy days and 169 mm of rain. It is hot, so plan sightseeing for mornings and evenings.
San Juan in November
WetIn November, San Juan averages highs of 31°C and lows of 23°C, with about 13 rainy days and 213 mm of rain. It is one of the wetter months, so keep indoor plans in reserve.
San Juan in December
WetIn December, San Juan averages highs of 29°C and lows of 22°C, with about 12 rainy days and 161 mm of rain. It is one of the wetter months, so keep indoor plans in reserve.
Top tours and experiences in San Juan
The tours and tickets travellers book most, with ratings and reviews from Viator.
Journey to Ischigualasto: Discovering the Valley of the Moon
4.827 reviews13h
from €199
Check availability
All things to do in San Juan →
Tours and prices from Viator, a Tripadvisor company. Prices change with your dates. We may earn a commission if you book, at no extra cost to you.
Plan your San Juan trip
Best time to visit San Juan: FAQ
What is the best month to visit San Juan?+
March is the most comfortable month on average, with highs of 29°C. April and January are close behind.
What is the rainiest month in San Juan?+
November is the wettest month, with about 213 mm of rain.
How hot does San Juan get?+
September is the warmest month, with average highs of 32°C and lows of 25°C. The coldest nights come in January, averaging 21°C.
Averages for 2006–2025 from the TOA BAJA LEVITTOWN weather station (7 km from the centre), NOAA Global Historical Climatology Network. Verdicts rate sightseeing comfort from daytime highs and rainy days.