How To Get Latest Temperature Reading For Each Date In A Date Range

I have to display the last temperature reading from an activity table for all the dates in a selected date range.So if I select the date range from 09/01/2012 to 09/30/2012, the results should look like this:

Date Temperature
09/01/2012 73.5
09/02/2012 75.2
09/03/2012 76.3
09/04/2012 73.3
09/05/2012 77.0
09/06/2012 74.5
and so on.

I am using this to get the dates listed:
WITH CTE_DatesTable
AS
(
SELECT CAST('20120901' as date) AS [Date]
UNION ALL
SELECT DATEADD(dd, 1, [Date])
FROM CTE_DatesTable
WHERE DATEADD(dd, 1, [Date]) <= '20120930'
)
SELECT [Date]
FROM CTE_DatesTable

How could I get the temperature if I did a sub-query here?