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Weather Guide: Ruta 40 (Patagonia Section)

Ruta 40 through Patagonia is an epic journey defined by its wild, untamed weather. Expect dramatic shifts, from bright sunshine to sudden storms, and prepare for relentless winds that sculpt the landscape and challenge travelers daily.

Climate: Cold Semi-arid (Patagonian Steppe)Elevation: Average 500m, with significant variations along its vast length (0m-2000m+)

Overview

The Patagonian section of Ruta 40 spans a cold, semi-arid steppe climate, characterized by low annual rainfall and extreme wind, especially during the warmer months. Temperatures vary significantly between seasons, with mild, windy summers and very cold, often snowy winters. Travelers must be prepared for rapidly changing conditions, including sudden temperature drops and intense gusts.

Monthly Weather

January

Peak
18°
7°
4 rainy days|0 snow days|9 hrs sun|70 km/h

January is peak summer, offering the warmest temperatures, but also the most intense winds. Days are long and generally dry, making it ideal for outdoor activities, though the persistent gusts can be a significant challenge.

February

Peak
17°
6°
4 rainy days|0 snow days|8 hrs sun|65 km/h

Similar to January, February sees continued mild temperatures and strong winds. While still summer, the days begin to shorten slightly, and the tourist season remains in full swing. Ideal for exploring the stunning landscapes.

March

High
14°
4°
5 rainy days|1 snow days|6 hrs sun|55 km/h

Autumn begins, bringing cooler temperatures and a slight increase in precipitation, with the first chance of snow in higher elevations. Winds remain strong but typically less extreme than mid-summer. Crowds start to thin.

April

Moderate
9°
1°
6 rainy days|3 snow days|5 hrs sun|50 km/h

April brings noticeably colder weather as winter approaches. Snow becomes more common, especially in the southern and higher sections of Ruta 40. While still possible to travel, road conditions can become challenging.

May

Low
5°
-2°
7 rainy days|5 snow days|3 hrs sun|45 km/h

May marks the onset of true winter conditions. Temperatures drop below freezing overnight, and snow becomes a regular occurrence. Many services along Ruta 40 may close for the season, and road access can be severely limited.

June

Low
2°
-5°
8 rainy days|10 snow days|2 hrs sun|40 km/h

Mid-winter on Ruta 40 is characterized by very cold temperatures, short daylight hours, and frequent heavy snowfall. Sections of the road may be closed for extended periods due to ice and snow. This is the least accessible month.

July

Low
1°
-6°
8 rainy days|12 snow days|2 hrs sun|40 km/h

July is the coldest month, often seeing the most significant snowfall and prolonged periods of sub-zero temperatures. Travel is extremely challenging, with many roads impassable. Services are minimal or non-existent.

August

Low
3°
-4°
7 rainy days|9 snow days|3 hrs sun|45 km/h

Winter slowly begins to recede, but August remains very cold with continued snowfall and icy conditions. Towards the end of the month, a hint of spring might appear, but reliable travel conditions are still a long way off.

September

Moderate
8°
-1°
6 rainy days|5 snow days|5 hrs sun|55 km/h

Spring arrives, bringing warming temperatures and longer days, though frosts and late-season snow are still common. Winds begin to pick up again. Services slowly start to reopen, and roads become more navigable.

October

Moderate
13°
3°
5 rainy days|2 snow days|7 hrs sun|65 km/h

October is a transitional month, offering a preview of summer's mildness but also the return of intense Patagonian winds. While still somewhat unpredictable, most sections of Ruta 40 are clear, and major attractions start to open.

November

High
16°
5°
4 rainy days|0 snow days|8 hrs sun|70 km/h

November is an excellent month to visit, combining pleasant temperatures with the full reopening of services and attractions, and slightly fewer crowds than peak summer. Winds are very strong, signaling the start of the high season.

December

Peak
18°
7°
4 rainy days|0 snow days|9 hrs sun|75 km/h

December marks the beginning of summer and the peak tourist season. Long daylight hours and the warmest temperatures make it highly desirable for travel, despite the notoriously fierce Patagonian winds being at their strongest.

Best Time to Visit

The best time to visit the Patagonian section of Ruta 40 is from mid-October to early April (late spring to early autumn). During this period, temperatures are mildest, daylight hours are longest, and services are fully operational. November and March offer a good balance of pleasant weather and slightly fewer crowds than the peak months of December to February, which are also excellent if you don't mind the high winds and busier sites.

Worst Time to Visit

The worst time to visit Ruta 40 in Patagonia is during the winter months, from May through September. During this period, temperatures are very cold, and heavy snowfall can make many sections of the road impassable due to ice and closures. Services are limited or non-existent, and the risk of being stranded is high.

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Weather Warnings

Extreme Wind: Patagonia is infamous for its powerful winds, which can reach gale-force speeds (over 100 km/h) at any time of year, particularly during spring and summer. These winds can make driving challenging, especially for high-sided vehicles, and can quickly cause hypothermia if not properly dressed.

Sudden Weather Changes: The weather can shift dramatically within hours, moving from bright sunshine to rain, snow, or sleet with strong winds. Always be prepared for multiple weather conditions on any given day.

Snow and Ice: In winter (May-September), heavy snowfall and icy conditions are common, leading to road closures, especially in higher passes. Even in spring and autumn, unexpected snow can occur.

UV Radiation: Despite often cooler temperatures, the Patagonian sun, especially in summer, can be intense due to its southerly latitude and clear air. High SPF sunscreen, sunglasses, and hats are crucial.

Isolation: Much of Ruta 40 passes through remote areas with limited services and no cell phone reception. Weather-related incidents can leave travelers isolated for extended periods.

Layering Guide

Dressing in layers is essential for Ruta 40. Start with a moisture-wicking base layer (merino wool or synthetic). Add an insulating mid-layer such as a fleece or a light down jacket. The crucial outer layer should be completely windproof and waterproof, yet breathable. Always carry a warm hat that can be secured, gloves, and a neck gaiter. In summer, include sun protection like a wide-brimmed hat, sunglasses, and high SPF sunscreen.

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Frequently Asked Questions

When is the best time to drive Ruta 40 through Patagonia?

The ideal time to drive Ruta 40 in Patagonia is from mid-October to early April. This period offers the most favorable weather conditions, longer daylight hours, and ensures that most services and attractions along the route are open.

How extreme are the winds in Patagonia?

The winds in Patagonia are notoriously extreme. During spring and summer, average wind speeds often exceed 50-70 km/h, with gusts frequently reaching over 100-120 km/h. They can make driving challenging, particularly for larger vehicles, and require excellent windproof gear for outdoor activities.

Are roads on Ruta 40 often closed due to weather?

Yes, especially during the winter months (May-September), many sections of Ruta 40, particularly the southern and higher elevation parts, can be closed due to heavy snow and ice. Even in spring and autumn, sudden snowstorms can cause temporary closures. Always check road conditions before and during your journey.

Do I need a 4x4 vehicle for Ruta 40?

While a 4x4 is not strictly necessary for the paved sections in good weather, it is highly recommended for exploring side roads, unpaved sections, and provides a significant advantage for safety and comfort, especially if encountering unexpected gravel, mud, or light snow. In winter, a 4x4 or a vehicle with chains is often essential.

How quickly can the weather change along Ruta 40?

Patagonian weather is famously unpredictable and can change dramatically within minutes. Travelers should be prepared for sun, wind, rain, and even snow, all in a single day. Layered clothing is crucial to adapt to these rapid shifts.

What are the essential items to pack for a trip on Ruta 40?

Essential items include robust windproof and waterproof outer layers, insulating fleeces or down jackets, thermal base layers, sturdy hiking boots, a secure hat, gloves, sunglasses, high SPF sunscreen, and a headlamp. For winter, add heavy-duty snow gear and tire chains.

Is cell phone service reliable along Ruta 40?

No, cell phone service is highly unreliable and often non-existent for long stretches of Ruta 40, particularly in the more remote Patagonian sections. It's crucial to download offline maps, carry physical maps, and consider a satellite communication device for emergencies.

Ruta 40 (Patagonia Section)

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