Udo Busch of the German meteorological agency DWD said if dry conditions prevail, the drought that caused severe crop damage in 2018 could be surpassed this year.
Strong winds in northern Germany have also whipped soil off the fields, creating sand storms in recent days.
The head of Germany's firefighters association, Hartmut Ziebs, called Wednesday for more helicopters to be put on standby to help extinguish potential fires. The country has seen a number of blazes in recent days.
Authorities in Berlin are urging residents to water thirsty trees that line the streets, saying city workers can't water them all.
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