Unbelievable Winter Twist: Argentina Boils at 15°C at Night While Japan Braces for Monster Storm Nari – What’s Going On?

Argentina’s Winter Heatwave 2025: Why It’s Hotter Than Summer in Buenos Aires While Japan Faces a Deadly Tropical Storm

In an astonishing twist of winter weather, Argentina is currently grappling with a surge of unseasonably warm temperatures 🌡️ across its northern and central regions. This unexpected heatwave has surprised both locals and meteorologists, with daytime temperatures soaring as much as 5°C to 7°C above the seasonal average, turning the chill of winter into a summer-like experience — especially in cities like Buenos Aires and Rosario.

The warm air, pushed in from neighboring Paraguay, started to infiltrate Argentina on Monday, with the mild spell forecast to linger through Tuesday, before a dramatic cold front sweeps in midweek.

🌤️ Heatwave Conditions: Argentina’s Unseasonal Climate Flip

While it may be winter on the calendar, the weather on the ground tells a different story. In Buenos Aires, temperatures on Tuesday are expected to reach around 7°C above normal, making it feel more like early spring or even summer ☀️. Even nighttime temperatures aren’t offering much relief. Instead of typical winter lows, many areas are seeing minimums in the low to mid-teens, with some areas reaching 14°C to 15°C at night 🌙— nearly 10°C higher than usual.

🌍 In Rosario, the largest city in Santa Fe Province, roughly 300 km northwest of Buenos Aires, conditions are expected to be particularly mild, potentially reaching record-breaking lows for winter in terms of nighttime warmth.

🌧️ Thunderstorms and Torrential Rain Threaten Tuesday

However, warm air masses can also mean instability in the atmosphere, and that’s exactly what is on the horizon. As the warmth peaks on Tuesday, so does the risk of severe weather events, particularly around Buenos Aires. Expect:

• ⛈️ Heavy showers
• 🌪️ Intense wind gusts
• 🌨️ Hailstorms
• 🌊 Torrential downpours

⚠️ A yellow alert has been issued by Argentina’s national weather service, highlighting the potential for 30-50 mm of rainfall within just 12 hours. These isolated storms are likely to merge into a larger band of rain by Tuesday evening, moving northeastward overnight, accompanied by the approaching cold front.

🥶 Cold Front Arriving Wednesday: The Weather Reset

By midday Wednesday, this turbulent weather will have cleared, ushering in a noticeable shift in conditions. The cold front is expected to leave behind dry, cool air, with daytime highs only reaching the mid-teens (°C). This sharp contrast could lead to some of the narrowest temperature variations ever recorded between Tuesday night and Wednesday day, with a diurnal swing of just 1°C to 1.5°C in cities like Buenos Aires and Rosario, where the typical difference is around 10°C to 12°C 🌡️❄️.

🌪️ Meanwhile in the Pacific: Tropical Storm Nari Targets Japan 🇯🇵

On the other side of the world, Japan is bracing for its own extreme weather. Tropical Storm Nari, located to the southeast of Japan, is strengthening as it moves northwestward toward the mainland. The storm is expected to intensify into a severe tropical storm by Monday morning, with sustained winds forecast to reach between 55-73 mph (89-117 km/h) 🌬️.

As Nari tracks along Japan’s northeastern coastline, it will bring:

• 🌧️ Sharp showers
• 🌊 Heavy rainfall
• 🌬️ Strong winds throughout the Kanto region

The Japan Meteorological Agency has already issued wind advisories, with rainfall projections ranging from 50-100 mm within 24 hours. Coastal and low-lying regions are especially vulnerable to flash flooding and localised disruptions as the storm passes.

🌎 Climate Unpredictability on Full Display

The simultaneous occurrence of a winter heatwave in South America and a tropical storm in East Asia paints a powerful picture of our increasingly unpredictable global climate. While the causes behind each event are unique, they are both extreme deviations from seasonal norms, and a reminder of the growing need to monitor weather patterns more closely.

With Argentina battling out-of-season warmth and storm threats, and Japan preparing for tropical deluges, residents in both nations should stay alert, follow safety guidance, and be ready for rapid changes in weather conditions.

✅ Conclusion: What to Watch For

Argentina’s unusual winter warmth is a clear signal of climate variability, compounded by potential severe weather that could bring real hazards to the region. Meanwhile, Tropical Storm Nari is gearing up to be Japan’s first major severe weather challenge of the season. Both events are stark reminders that extreme weather doesn’t wait for the right season to strike.

Stay tuned to official meteorological updates, prepare for sudden weather shifts, and take weather warnings seriously 🌍🌧️🔥.

❓FAQs: Unusual Weather in Argentina & Tropical Storm Nari

Q1. Why is Argentina experiencing warm weather in winter?

👉 A plume of warm air from Paraguay has drifted into northern and central Argentina, raising temperatures significantly above seasonal averages.

Q2. What is the temperature difference from normal in Buenos Aires?

👉 Buenos Aires is expected to experience temperatures up to 7°C higher than normal during the current warm spell.

Q3. Will this warm spell affect only daytime temperatures?

👉 No. Nighttime lows are also unusually high, with some areas reaching 14°C to 15°C, nearly 10°C above average.

Q4. Is the storm in Japan connected to Argentina’s weather?

👉 Not directly. The two systems are separate, but both showcase extreme weather events happening simultaneously across the globe.

Q5. How strong is Tropical Storm Nari expected to be?

👉 Nari is forecast to reach severe tropical storm strength, with wind speeds of 55-73 mph, and could bring 100mm+ of rain to parts of Japan.