Climate Overview
The climate in Guanaja is hot. The average annual temperature is 27°C and approximately 1459mm of precipitation falls per year. Guanaja receives a notable amount of rainfall throughout the year, including during its driest month. Guanaja is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: September, August, July. The coldest months are January, February, December, when temperatures can drop to 25°C.
Temperature
Guanaja has relatively stable temperatures year-round, staying within a 4°C range. The warmest month is September, when average highs reach 29°C and the mean temperature sits around 28°C. January is the coolest month, with minimum temperatures around 25°C and an average of 25°C. Daily temperature variation is modest, with an average difference of 1°C between highs and lows.
Precipitation
Guanaja is a fairly wet location, receiving approximately 1459mm of precipitation annually, which averages out to around 122mm per month. The wettest month is October, averaging 312mm of rainfall. November and December also tend to see above-average precipitation. The driest month is April, with just 31mm. That's 281mm less than October, 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
Guanaja is relatively calm, with an average annual wind speed of 7km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is June, averaging 8km/h, though still comfortable for most outdoor activities. The calmest conditions occur in November, with average winds dropping to 5km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 3km/h gap between the calmest and windiest months.
Seasons
84 days until Autumn
It is currently summer in Guanaja, which began on June 21, 2026. Guanaja 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 September at around 29°C, while the coldest stretch bottoms out in January near 25°C. Autumn is next, beginning on September 23, 2026 — 84 days from now.
Spring
Temperatures range from 25 to 28°C. Rainfall is relatively light, with around 113mm over the season and a monthly average of 38mm. Winds are generally light, averaging 7km/h. Light layers work well as temperatures warm through the season — a great time to be outdoors.
Summer
Temperatures range from 27 to 29°C. Rainfall is heavy, totalling around 319mm across the season with a monthly average of 106mm. Winds are generally light, averaging 7km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 26 to 29°C. Rainfall is heavy, totalling around 660mm across the season with a monthly average of 220mm. Winds are generally light, averaging 5km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 25 to 27°C. Rainfall is heavy, totalling around 367mm across the season with a monthly average of 122mm. Winds are generally light, averaging 7km/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 Guanaja 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.
