Even if you're coming in the middle of summer, you need to bring some fairly heavy duty cold weather gear - a good, windproof jacket, stout shoes, scarf, gloves and hat. Layers work best during the day when the sun can be warm but the wind chilly - especially at the glaciers - and once the sun goes down, it does get cold.
Miscellaneous: A small set of binoculars is a great thing to tuck into a corner of your bag. They'll enable you to get a closer look at everything from birds on the lagoon to icebergs floating down the lake that may otherwise be no more than a speck in the distance, including that condor flying way overhead. We saw condor every day - they may have been the same ones of course, these magnificent birds are endangered - and we didn't get a photo that was worth having, but we certainly managed to get a good look at them through the binoculars we always carry.
I was at El Calafate during the summertime; temperature rarely exceed 20º C, and weather is very changing; bring a waterproof coat. The Glaciers National Park is really cold, so do not forget your cap, your scarf and your gloves, and de adquate shoes.
Estuve en El Calafate durante el verano; la temperatura rara vez supera los 20º C, y el tiempo es muy cambiante; traigan una chaqueta impermeable. En el Parque Nacional Los Glaciares realmente hace frío; no olviden su gorro, bufanda y guantes, y el calzado adecuado.
Clothing/Shoes/Weather Gear: if you visit during the summer months December -January pack so that you can layer your clothes. it is cold for those of us who come from tropical weather but you'll find you have to take off some of that heavy clothing when the sun is out. Don't forget your sunscreen - the sun is very intense and reflects off if the ice.
We visited El Calafate during late spring (early December) and still it can be ‘winter’. Specially when visiting the glaciers or making a boat trip on one of the lakes it can be (very) cold. Besides the weather can change very quickly; during our visit we had wonderful sunny weather in the morning in El Calafate and in the afternoon near the glaciers it was cloudy, windy and very cold.
What to pack for El Calafate (and Patagonia)
Clothes: best to wear in layers
Wind- and waterproof jacket
Good shoes (specially if you intend to do the trekking on the glacier)
Hat/cap and gloves
For weather info: http://www.patagonia-argentina.com/i/content/clima.htm
Toiletries and Medical Supplies: UV filter sun glasses and Sunscreen lotion, 30+ (the sun is very intensive, even if there are clouds)
Photo Equipment: Enough space on your memory card.
Clothing/Shoes/Weather Gear: if you visit during their summer months December -January pack so that you can layer your clothes. it is cold for those of us who come from tropical weather but you'll find you have to take off some of that heavy clothing when the sun is out. Don't forget your sunscreen - the sun is very intense and reflects off if the ice.
I was here at the end of summer and I was just freezing when visiting the glacier. On the boat it was cold that I had to stay inside drinking hot tea instead of whisky with glacier ice.
Make sure you take gloves, cap, good shoes, some warm clothes and a rain coat.
For outdoor activities you need to take warm clothing (polar fabric is the best), jogging outfit, raincoat and a hat. Near the glaciers and in the mountains, don’t forget to take a windbraker
Miscellaneous: Summer days are very long, there is sunlight until 10:30 PM. Take a hat or a cap and don’t forget to take sunscreen lotion N° 30 or higher. It is highly recommended to use UV filter sunglasses, specially when visitin glaciers. Under low temperatures, batteries run out faster, so have always an extra supply..
Bring clothes that you can layer because by afternoon it may be quite warm.
We thought it would be cold out by the glacier but it wasn't.
Miscellaneous: There are shops all along the main street and you can find most anything that you might need.
Luggage and bags:
meanwhile we were there in summer, the weather was cold! You have to pack in jackets, sweaters etc for winter. Believe me, is cold! Take a waterproof sneakers like CAT, COLUMBIA, ETC and very confortable, and no new one!
Toiletries and Medical Supplies: cold caps
Photo Equipment: all that you can
Luggage and bags:
Have a backpack handy
Clothing/Shoes/Weather Gear: Bring layers especially when you make your trip to view the glacier. When you go on the boat, the chill from the glacier is quite cold. Other than that the temperature is fairly comfortable.
Photo Equipment: Batteries are available at the National Park in case you run out, however they are expensive. Bring a video camera if you have one.
Regardless of time of year, it does get cold here especially when the sun disappears and the wind starts up. It's a good idea to bring a wind and water proof jacket, hat and gloves.
Toiletries and Medical Supplies: Sunblock - the sun is strong here too!