Climate Overview
The climate in Tonj is hot. The average annual temperature is 29°C and approximately 823mm of precipitation falls per year. August is the wettest month, receiving around 153mm of rainfall. Tonj sits near the equator, so seasonal temperature differences are minimal throughout the year.
Temperature
Tonj sees moderate temperature variation throughout the year, ranging from 23°C to 39°C. March is the hottest month, with daytime highs reaching 39°C and an average of 33°C. August is the coolest month, with minimum temperatures around 23°C and an average of 26°C. On average, daily temperatures fluctuate by about 10°C between overnight lows and afternoon highs. The sharpest temperature change occurs between April and May, with a 2°C shift in average temperatures.
Precipitation
Tonj is a moderately rainy area, receiving approximately 823mm of precipitation annually, which averages out to around 69mm per month. The wettest month is August, averaging 153mm of rainfall. July and September also tend to see above-average precipitation. The driest month is January, with just 0mm. That's 153mm less than August, 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
Tonj 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. There is moderate seasonal variation in wind speed, with a 2km/h gap between the calmest and windiest months.
Seasons
92 days until Autumn
It is currently summer in Tonj, which began on June 21, 2026. Tonj sits near the equator, so the traditional four-season cycle is less pronounced — temperatures remain relatively stable year-round. The warmest period peaks in March at around 39°C, while the coldest stretch bottoms out in August near 23°C. Autumn is next, beginning on September 23, 2026 — 92 days from now.
Spring
Temperatures range from 25 to 39°C. Precipitation is moderate at around 160mm for the season, averaging 53mm per month. Winds are generally light, averaging 2km/h. Light layers work well as temperatures warm through the season — a great time to be outdoors.
Summer
Temperatures range from 23 to 32°C. Rainfall is heavy, totalling around 411mm across the season with a monthly average of 137mm. Winds are generally light, averaging 2km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 23 to 35°C. Precipitation is moderate at around 247mm for the season, averaging 82mm per month. Winds are generally light, averaging 2km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 24 to 39°C. Precipitation is minimal, with only around 4mm for the entire season. Winds are generally light, averaging 3km/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 Tonj 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.
