Climate Overview
The climate in San Agustín Acasaguastlán is warm and mild. The average annual temperature is 22°C and approximately 1276mm of precipitation falls per year. June is the wettest month, receiving around 268mm of rainfall. San Agustín Acasaguastlán is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: May, April, June. The coldest months are January, February, December, when temperatures can drop to 15°C.
Temperature
San Agustín Acasaguastlán sees moderate temperature variation throughout the year, ranging from 15°C to 31°C. The warmest month is May, when average highs reach 31°C and the mean temperature sits around 25°C. January is the coolest month, with minimum temperatures around 15°C and an average of 20°C. On average, daily temperatures fluctuate by about 10°C between overnight lows and afternoon highs. The sharpest temperature change occurs between March and April, with a 2°C shift in average temperatures.
Precipitation
San Agustín Acasaguastlán is a fairly wet location, receiving approximately 1276mm of precipitation annually, which averages out to around 106mm per month. The wettest month is June, averaging 268mm of rainfall. September and August also tend to see above-average precipitation. The driest month is February, with just 19mm. That's 249mm 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 Agustín Acasaguastlán is relatively calm, with an average annual wind speed of 8km/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 10km/h, though still comfortable for most outdoor activities. The calmest conditions occur in October, with average winds dropping to 8km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 2km/h between the calmest and windiest months.
Seasons
89 days until Summer
It is currently spring in San Agustín Acasaguastlán, which began on March 20, 2026. San Agustín Acasaguastlán 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 May at around 31°C, while the coldest stretch bottoms out in January near 15°C. Summer is next, beginning on June 21, 2026 — 89 days from now.
Spring
Temperatures range from 17 to 31°C. Precipitation is moderate at around 172mm for the season, averaging 57mm per month. Winds are generally light, averaging 9km/h. Light layers work well as temperatures warm through the season — a great time to be outdoors.
Summer
Temperatures range from 19 to 29°C. Rainfall is heavy, totalling around 584mm across the season with a monthly average of 195mm. Winds are generally light, averaging 8km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 18 to 29°C. Rainfall is heavy, totalling around 445mm across the season with a monthly average of 148mm. Winds are generally light, averaging 8km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 15 to 26°C. Rainfall is relatively light, with around 74mm over the season and a monthly average of 25mm. Winds are generally light, averaging 9km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.
Best Time to Visit
The best time to visit San Agustín Acasaguastlán is during January, February, March, April, November and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 21°C with modest rainfall averaging 38mm per month. By contrast, May can be uncomfortably hot with temperatures reaching 31°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.
Monthly Climate Data
The table below shows monthly climate averages for San Agustín Acasaguastlán 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.
