Climate Overview
The climate in San Juan Opico is hot. The average annual temperature is 27°C and approximately 765mm of precipitation falls per year. June is the wettest month, receiving around 205mm of rainfall. San Juan Opico is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: April, March, May. The coldest months are January, February, December, when temperatures can drop to 20°C.
Temperature
San Juan Opico sees moderate temperature variation throughout the year, ranging from 20°C to 36°C. April is the hottest month, with daytime highs reaching 36°C and an average of 29°C. January is the coolest month, with minimum temperatures around 20°C and an average of 26°C. On average, daily temperatures fluctuate by about 11°C between overnight lows and afternoon highs.
Precipitation
San Juan Opico is a relatively dry area, receiving approximately 765mm of precipitation annually, which averages out to around 64mm per month. The wettest month is June, averaging 205mm of rainfall. September and October also tend to see above-average precipitation. The driest month is January, with just 1mm. That's 205mm less than June, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.
Wind
San Juan Opico is relatively calm, with an average annual wind speed of 6km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is January, averaging 9km/h, though still comfortable for most outdoor activities. The calmest conditions occur in September, with average winds dropping to 4km/h, making it an ideal period for wind-sensitive activities. Wind speeds vary significantly across the year, with a 5km/h difference between the calmest and windiest months. This level of variation is worth factoring into travel plans. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 9km/h in winter, 6km/h in spring, 5km/h in summer, 6km/h in autumn.
Seasons
87 days until Winter
It is currently autumn in San Juan Opico, which began on September 23, 2026. San Juan Opico is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in April at around 36°C, while the coldest stretch bottoms out in January near 20°C. Winter is next, beginning on December 21, 2026 (87 days from now).
Spring
Temperatures range from 22 to 36°C. Rainfall is relatively light, with around 108mm over the season and a monthly average of 36mm. Winds are generally light, averaging 6km/h. Light layers work well as temperatures warm through the season. It is a great time to be outdoors.
Summer
Temperatures range from 23 to 34°C. Rainfall is heavy, totalling around 361mm across the season with a monthly average of 120mm. Winds are generally light, averaging 5km/h. Light, breathable clothing is ideal. Perfect conditions for outdoor activities.
Autumn
Temperatures range from 22 to 33°C. Precipitation is moderate at around 290mm for the season, averaging 97mm per month. Winds are generally light, averaging 6km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 20 to 34°C. Precipitation is minimal, with only around 5mm for the entire season. Winds are generally light, averaging 9km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.
Monthly Climate Data
The table below shows monthly climate averages for San Juan Opico based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.
