Climate Overview
The climate in Rio Negro is temperate. The average annual temperature is 18°C and approximately 1486mm of precipitation falls per year. Rio Negro receives a notable amount of rainfall throughout the year, including during its driest month. Rio Negro is in the Southern Hemisphere. The seasons are reversed — summer runs from December to February, while winter falls between June and August. The summer months are: February, January, April. The coldest months are June, July, August, when temperatures can drop to 7°C.
Temperature
Rio Negro sees moderate temperature variation throughout the year, ranging from 7°C to 27°C. The warmest month is February, when average highs reach 27°C and the mean temperature sits around 22°C. June is the coolest month, with minimum temperatures around 7°C and an average of 11°C. On average, daily temperatures fluctuate by about 9°C between overnight lows and afternoon highs. The sharpest temperature change occurs between April and May, with a 6°C shift in average temperatures.
Precipitation
Rio Negro is a fairly wet location, receiving approximately 1486mm of precipitation annually, which averages out to around 124mm per month. The wettest month is February, averaging 214mm of rainfall. December and August also tend to see above-average precipitation. The driest month is September, with just 58mm. That's 156mm less than February, the wettest month. Precipitation varies noticeably between seasons, with the first half (January to June) of the year generally seeing more rainfall.
Wind
Rio Negro is relatively calm, with an average annual wind speed of 3km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is October, averaging 3km/h, though still comfortable for most outdoor activities. The calmest conditions occur in June, with average winds dropping to 2km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 1km/h gap between the calmest and windiest months.
Seasons
61 days until Spring
It is currently winter in Rio Negro, which began on June 21, 2026. Rio Negro is in the Southern Hemisphere, where the seasons are reversed — spring starts in September, summer in December, autumn in March, and winter in June. The warmest period peaks in February at around 27°C, while the coldest stretch bottoms out in June near 7°C. Spring is next, beginning on September 23, 2026 — 61 days from now.
Spring
Temperatures range from 11 to 25°C. Precipitation is moderate at around 284mm for the season, averaging 95mm per month. Winds are generally light, averaging 3km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 17 to 27°C. Rainfall is heavy, totalling around 525mm across the season with a monthly average of 175mm. Winds are generally light, averaging 3km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 12 to 26°C. Rainfall is heavy, totalling around 356mm across the season with a monthly average of 119mm. Winds are generally light, averaging 2km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 7 to 20°C. Rainfall is heavy, totalling around 322mm across the season with a monthly average of 107mm. Winds are generally light, averaging 2km/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 Rio Negro is during April, September and November, when the weather is most comfortable for travellers. During these months, average temperatures hover around 19°C with modest rainfall averaging 78mm per month. By contrast, February can be uncomfortably hot with highs reaching 27°C, while June is the coldest period with lows dropping to 7°C. Despite being the best months overall, some rain is still likely — pack a waterproof layer and plan a mix of indoor and outdoor activities.
Monthly Climate Data
The table below shows monthly climate averages for Rio Negro 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.