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\addplot[forget plot,only marks] plot[error bars/.cd, y dir=plus, y explicit, error mark=*] table [col sep=comma,trim cells=true, x=Date, y=value1, y error expr=\thisrow{value2} - \thisrow{value1}] {log.txt};

\addplot[forget plot,only marks] plot[error bars/.cd, y dir=plus, y explicit, error mark=*] table [col sep=comma,trim cells=true, x=Date, y=value1, y error expr=\thisrow{value2}] {log.txt};
\end{axis}

\documentclass[paper=a3,12pt,version=last,landscape]{scrartcl}

\usepackage[ngerman]{babel}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{lmodern}

\usepackage{pgfplots}
\usepgfplotslibrary{dateplot}
\usepackage{geometry}
\geometry{left=1cm,right=1cm,top=2.3cm, bottom=1.3cm, bindingoffset=5mm}


\begin{document}
\begin{tikzpicture}




\begin{axis}[
grid=major,
width=0.9\textwidth,height=0.9\textheight,
title={xxx},
ylabel={\% relative Feuchtigkeit},
date coordinates in=x,
xticklabel={\day.\month.\year},
x tick label style={yshift=-3pt,xshift=-4pt,rotate=-90,anchor=west, font=\small},
extra y ticks={22.7375, 61.4002},
extra y tick labels={{22.7375 \%},{61.4002 \%}},
extra y tick style={grid=major, tick label style={xshift=-1cm}},
%x tick label style={align=center},
date ZERO=2014-01-01, % Set near lowest date
xmin={2014-11-18}, % A date with no time is assumed to have a time of 00:00
xmax={2015-11-17}
]
\addplot[color = red, mark  = *] table [col sep=comma,trim cells=true,y=value2] {log.txt};
\addplot[color = blue, mark  = *] table [col sep=comma,trim cells=true,y=value1] {log.txt};


\end{axis}

\end{tikzpicture}
\end{document}

Date,                   value1,         value2
2015-09-28 00:00,       37.940701,      53.216702
2015-09-29 00:00,       33.932499,      41.861401
2015-09-30 00:00,       31.538300,      44.912800
2015-10-01 00:00,       29.873400,      40.666302
2015-10-02 00:00,       30.007000,      41.048100
2015-10-05 00:00,       46.195599,      50.068401
2015-10-06 00:00,       51.919300,      59.680801
2015-10-07 00:00,       55.654598,      60.191700
2015-10-08 00:00,       42.167198,      59.305099
2015-10-09 00:00,       44.542400,      52.736401
2015-10-12 00:00,       32.629700,      53.524700
2015-10-13 00:00,       34.199799,      43.847000
2015-10-14 00:00,       36.156200,      42.645599
2015-10-15 00:00,       36.279400,      44.408298
2015-10-19 00:00,       38.330101,      47.482700
2015-10-20 00:00,       39.765701,      45.308800
2015-10-21 00:00,       39.665298,      46.922600
2015-10-22 00:00,       37.822201,      45.925098
2015-10-23 00:00,       39.664101,      48.715599
2015-10-26 00:00,       43.057999,      49.921299
2015-10-27 00:00,       36.232700,      45.382599
2015-10-28 00:00,       39.736900,      46.449402
2015-10-29 00:00,       38.174599,      45.928799
2015-10-30 00:00,       37.616501,      46.561199
2015-11-02 00:00,       31.866600,      43.014000
2015-11-03 00:00,       30.594299,      38.580002
2015-11-04 00:00,       30.761400,      41.931301
2015-11-05 00:00,       38.021599,      62.745098
2015-11-06 00:00,       47.845299,      59.813400