The annual weather charts for Potosi (not far, but not exactly Uyuni...) says the greatest rainfall all year is in mid-March.
https://www.worldweatheronline.com/l...potosi/bo.aspx
A former Bolivia tour company director told me the rain water is pushed to the eastern side of the salar by the prevailing winds, which is basically where Uyuni is located. You stand a good chance of find some water this time of year. I was there is early March 2013 and saw areas with water on the eastern side and large areas that were dry to toward the center of the salar.
If you don't want to get salt/salt water on your bike, stay to the edges and work your way to the western side of the salar.
I meet a Japanese tour guide in one of the larger hostels as she was head bed around 9:00 PM. The tour group was getting up way before dawn because, "Seeing the stars reflect on the water is very important to Japanese people." Good to know. I slept in past sun rise when the tour truck took us out to Isla del Pescado, the salt works and salt hotel... My bike stayed in Uyuni as she is on a strict no salt diet. =)
Sometimes you can find a spot where you can whack away at the salt and break off nice chunks of salt crystals. The salar is actually a lake with an extra thick layer of salt floating on it.
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Peter B
2008/09 - NJ to Costa Rica and back to NJ
2012/13 - NJ to Northern Argentina, Jamaica, Cuba and back to NJ
2023 - Peru, Brazil, Paraguay, Argentina, Chile, Bolivia...back to Peru.
Blogs: Peter's Ride
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