Climate Insights for Izalco

The climate in Izalco is warm and mild. The average annual temperature is 25°C and approximately 1618mm of precipitation falls per year. September is the wettest month, receiving around 314mm of rainfall. Izalco is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: March, April, July. The coldest months are January, December, February, when temperatures can drop to 19°C.

Izalco sees moderate temperature variation throughout the year, ranging from 19°C to 32°C. The warmest month is March, when average highs reach 32°C and the mean temperature sits around 25°C. January is the coolest month, with minimum temperatures around 19°C and an average of 24°C. On average, daily temperatures fluctuate by about 10°C between overnight lows and afternoon highs.

Izalco is a fairly wet location, receiving approximately 1618mm of precipitation annually, which averages out to around 135mm per month. The wettest month is September, averaging 314mm of rainfall. June and October also tend to see above-average precipitation. The driest month is January, with just 4mm. That's 311mm less than September, 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.

Izalco is relatively calm, with an average annual wind speed of 2km/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 3km/h, though still comfortable for most outdoor activities. The calmest conditions occur in September, with average winds dropping to 1km/h, making it an ideal period for wind-sensitive activities. Wind speeds vary significantly across the year, with a 2km/h difference between the calmest and windiest months. This level of variation is worth factoring into travel plans.

It is currently summer in Izalco, which began on June 21, 2026. Izalco 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 32°C, while the coldest stretch bottoms out in January near 19°C. Autumn is next, beginning on September 23, 2026 — 93 days from now.

The best time to visit Izalco is during January, February, November and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 24°C with modest rainfall averaging 18mm per month. By contrast, March can be uncomfortably hot with temperatures reaching 32°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Izalco 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.