Climate Overview
The climate in Usulután is hot. The average annual temperature is 28°C and approximately 1765mm of precipitation falls per year. June is the wettest month, receiving around 352mm of rainfall. Usulután is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: March, April, February. The coldest months are January, February, December, when temperatures can drop to 24°C.
Temperature
Usulután has relatively stable temperatures year-round, staying within a 9°C range. The warmest month is March, when average highs reach 33°C and the mean temperature sits around 29°C. January is the coolest month, with minimum temperatures around 24°C and an average of 28°C. Daily temperature variation is modest, with an average difference of 7°C between highs and lows.
Precipitation
Usulután is a fairly wet location, receiving approximately 1765mm of precipitation annually, which averages out to around 147mm per month. The wettest month is June, averaging 352mm of rainfall. October and September also tend to see above-average precipitation. The driest month is January, with just 1mm. That's 351mm 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
Usulután is mildly breezy, with an average annual wind speed of 13km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is March, averaging 16km/h, though still comfortable for most outdoor activities. The calmest conditions occur in November, with average winds dropping to 10km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 6km/h gap between the calmest and windiest months.
Seasons
89 days until Summer
It is currently spring in Usulután, which began on March 20, 2026. Usulután 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 March at around 33°C, while the coldest stretch bottoms out in January near 24°C. Summer is next, beginning on June 21, 2026 — 89 days from now.
Spring
Temperatures range from 25 to 33°C. Precipitation is moderate at around 217mm for the season, averaging 72mm per month. Winds are generally light, averaging 15km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 25 to 32°C. Rainfall is heavy, totalling around 755mm across the season with a monthly average of 252mm. Winds are generally light, averaging 12km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 25 to 31°C. Rainfall is heavy, totalling around 785mm across the season with a monthly average of 262mm. Winds are generally light, averaging 10km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 24 to 33°C. Precipitation is minimal, with only around 8mm for the entire season. Winds are generally light, averaging 14km/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 Usulután 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.
