You’re standing on Avenida 9 de Julio, looking up at the Obelisco, and the air feels like a warm, wet blanket. That is January in Buenos Aires for you. If you’re checking the weather buenos aires 10 day forecast, you probably see a lot of sun icons and temperatures that look manageable on paper, but there is a specific rhythm to this city’s summer that a standard app won't tell you.
Honestly, the humidity here is a character of its own. Right now, on Friday, January 16, 2026, it is a crisp 77°F with a very dry 42% humidity. That is actually a gift. Usually, the city is a lot "stickier." If you’re planning your week, you’ve caught a lucky break today with sunny skies and a gentle 12 mph breeze coming off the river from the east.
But don't get too comfortable.
The Rhythm of the Weather Buenos Aires 10 Day Forecast
Basically, the next few days are going to be a classic "ascent" toward a summer storm. Tomorrow, Saturday, January 17, the heat starts to crank up. We’re looking at a high of 87°F. By nightfall, the humidity jumps to 56%, and there is a 40% chance of rain. This is the city’s standard operating procedure: it builds heat and moisture for a few days until the atmosphere just can't hold it anymore.
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Sunday, January 18, brings a sudden shift. The wind flips to the southeast at 17 mph, and the high drops back down to 77°F.
People often get confused by these swings. They see a 10-degree drop and think autumn arrived early. In reality, it’s just the Sudestada or a mild Pampero—local winds that act like the city's natural air conditioning.
Monday, January 19, looks even cooler with a high of 71°F. It’s the kind of day where you actually want to be outside at a sidewalk cafe in Palermo Soho without melting into your espresso.
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Mid-Week Heat and UV Warnings
By Tuesday, January 20, the sun is back in full force. We’re hitting 77°F again, and then it’s a steady climb:
- Wednesday: 82°F
- Thursday: 84°F
- Friday: 80°F (A slight dip, but the humidity will be up at 61%)
One thing you absolutely cannot ignore in the weather buenos aires 10 day forecast is the UV index. For almost this entire 10-day stretch, the UV index is hitting 10. In Buenos Aires, that is "extreme." You will burn in fifteen minutes if you aren't careful. Locals don't really walk on the sunny side of the street during the afternoon for a reason.
What’s Happening Next Weekend?
Looking further out to Saturday, January 24, and Sunday, January 25, the temperatures stay consistent in the mid-80s, but the clouds start to move in.
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Sunday night, January 25, is the one to watch. There is a 65% chance of light rain as the temperature stays a muggy 75°F overnight. This usually signals a more significant pressure change. If you have a flight out on that Monday, keep an eye on the sky; these summer storms can be brief but incredibly intense, occasionally turning streets into temporary streams.
Actionable Tips for the 10-Day Stretch
- Hydrate like it’s your job: With the humidity jumping between 40% and 60% this week, you’ll lose more water than you realize.
- The "Shadow" Rule: Between 12:00 PM and 4:00 PM, stay in the shade. With a UV index of 10, the sun is not your friend.
- Dress in Layers: The jump from a 66°F morning to an 87°F afternoon on Saturday is significant.
- Watch the Wind: If the wind shifts to the North (like it will on Wednesday at 14 mph), expect the "oppressive" heat to return. If it’s from the Southeast (like Sunday), it’s the best time for a walk in the Reserva Ecológica.
The weather here is a living thing, shaped by the massive Río de la Plata and the flat pampas surrounding the city. Enjoy the mid-70s while they last early this week, because the humidity always finds its way back eventually.