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It is the tires pumping water away and sucking it up on the back thread mainly, but also increased air resistance from droplets on the bodywork, AC to prevent fogging, lights where they would not be needed in fair weather.
I reset my Trip B counter at every cold start so I see what economy my commute yields.
My best trip in rainy conditions is about 3.7 l per 100 km.
My best in dry conditions is 3.1 l per 100 km, same route, and I have hundreds of dry commutes all beating my best wet FE.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gmeter or 0.13 Mmile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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