With the enumitem
package you can define your own itemize
environment for tables. In the second example I have used tabularx
to make the table as wide as the textwidth:

\documentclass{article}
\usepackage{enumitem}
\newlist{tabitemize}{itemize}{1}
\setlist[tabitemize]{label=\textbullet,nosep,after=\strut,align=parleft,leftmargin=*,after=\vspace{-\baselineskip},before=\vspace{-0.75\baselineskip}}
\usepackage{tabularx}
\begin{document}
\begin{tabular}{ | l | l | l | p{8cm} |}
\hline
Day & Min Temp & Max Temp &
\begin{tabitemize}
\item El 1
\item El 2
\item El 2
\item El 2
\item El 2
\item El 2
\item El 2
\item El 2
\end{tabitemize}
\\ \hline
Monday & 11C & 22C & A clear day with lots of sunshine.
However, the strong breeze will bring down the temperatures. \\ \hline
\end{tabular}
\bigskip
\begin{tabularx}{\textwidth}{ | l | l | l | X |}
\hline
Day & Min Temp & Max Temp &
\begin{tabitemize}
\item El 1
\item El 2
\item El 2
\item El 2
\item El 2
\item El 2
\item El 2
\item El 2
\end{tabitemize}
\\ \hline
Monday & 11C & 22C & A clear day with lots of sunshine.
However, the strong breeze will bring down the temperatures. \\ \hline
\end{tabularx}
\end{document}
For a more open look of the table, you could also use the booktabs
package:
\documentclass{article}
\usepackage{enumitem}
\newlist{tabitemize}{itemize}{1}
\setlist[tabitemize]{label=\textbullet,nosep,after=\strut,align=parleft,leftmargin=*,after=\vspace{-\baselineskip},before=\vspace{-0.75\baselineskip}}
\usepackage{tabularx}
\usepackage{booktabs}
\begin{document}
\begin{tabularx}{\textwidth}{ l l l X }
\toprule
Day & Min Temp & Max Temp &
\begin{tabitemize}
\item El 1
\item El 2
\item El 2
\item El 2
\item El 2
\item El 2
\item El 2
\item El 2
\end{tabitemize}
\\ \midrule
Monday & 11C & 22C & A clear day with lots of sunshine.
However, the strong breeze will bring down the temperatures. \\ \bottomrule
\end{tabularx}
\end{document}

\documentclass{...}
and ending with\end{document}
containing your table. now people who like to help you should guessing about your document preamble ...