The sweltering heat forecast for Germany this weekend is set to intensify, while temperatures in the Spanish capital will average 36.5C (97.7F) over the next 10 days, according to forecaster Maxar Technologies Inc.

Frankfurt will be 6.6C hotter than the seasonal average on Sunday, with temperatures reaching 35.5C, Maxar said Friday. That’s up 1C from yesterday’s forecast. Cooler weather will push in from Wednesday, although the south of the country and parts of the Alps will remain warmer than the norm.

The heat scorching parts of Europe has hit German transport networks as water levels in the Rhine River are set to fall to critically low levels in the coming weeks. Climate change is increasing the frequency of extreme weather across the region, with a historic drought last summer shriveling waterways and disrupting the shipment of key commodities.

Rhine River Set for Critical Summer as Heat Bakes Europe

Southern and central Spain will experience searing temperatures through next week, with Madrid reaching at least 38C for four consecutive days from Monday.