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Best Time to Hike GR 20 Principale

wb_sunny Best months: June, August
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Month-by-month temperatures and rainfall for GR 20 Principale, France, based on 2-year climate normals.

Month-by-month weather on GR 20 Principale

Month Avg high Avg low Rainfall Rainy days
January 5°C / 41°F -0.5°C / 31°F 144 mm 17
February 6.6°C / 44°F -0.5°C / 31°F 109 mm 9
March 7.7°C / 46°F 0.4°C / 33°F 196 mm 17
April 11.4°C / 53°F 3.4°C / 38°F 110 mm 15
May 13.8°C / 57°F 6°C / 43°F 121 mm 17
June 21.2°C / 70°F 12.2°C / 54°F 24 mm 7
July 23.4°C / 74°F 14.7°C / 58°F 33 mm 10
August 23.4°C / 74°F 15.2°C / 59°F 34 mm 7
September 17.5°C / 64°F 9.8°C / 50°F 73 mm 12
October 13.6°C / 56°F 6.9°C / 44°F 189 mm 18
November 9.1°C / 48°F 2.2°C / 36°F 96 mm 9
December 5.4°C / 42°F -0.9°C / 30°F 124 mm 12

Highlighted rows are the recommended hiking window. Climate normals via Open-Meteo (2-year average). Mountain weather varies — always check a live forecast before you set off.

When to go

The best months to hike GR 20 Principale are June, August. Expect daytime highs around 22°C (72°F) and nights near 14°C (57°F).

Pack flexible layers and a reliable rain shell — conditions can shift quickly in the mountains.

GR 20 Principale

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