BOM (Bureau of Meteorology) in Australia have data feeds available for weather. This is a quick convenient python class for fetching that data.

weather.py

import urllib2
import datetime

""" 
Module for implementing BOM services.  The BOMForcast class will fetch 7 days 
of weather temperature and precis data. It also implements a handy iterator for
looping through forecast days.

See http://www.bom.gov.au/catalogue/data-feeds.shtml for more information on 
data feeds available.
"""

SERVICE_URL = "ftp://ftp2.bom.gov.au/anon/gen/fwo/IDA00002.dat" # 7 day Precis
SITE_NO = "066062"
SITE_NAME = "Sydney"

class BOMForcast:
    """ 
    Retrieve and store 7 days of weather forecast from Bureau of Meteorology (Australian Government).
    """
    data = []
    service = ""
    prefix = "%s#%s#" % (SITE_NO, SITE_NAME)
    error = None

    def __init__(self):
        self.__fetch()
        self.itercurrent = 0

    def __fetch(self):
        try:
            response = urllib2.urlopen(SERVICE_URL)
            raw = response.read()
        except:
            return  #broken 

        for line in raw.split("\n"):
            # Find the record we want "Eg. Sydney"
            if line[0:len(self.prefix)] == self.prefix:
                cols = line.split("#")
                fdate = datetime.datetime.strptime(cols[3], "%Y%m%d")
                idate = datetime.datetime.strptime(cols[4]+cols[5], "%Y%m%d%H%M%S")
                for i in range(7):
                    # build it data set
                    self.data.append({
                        "forecast_date": datetime.date(fdate.year, fdate.month, fdate.day + i),
                        "issue_date":idate,
                        "temperature_min":cols[6 + i],
                        "temperature_max":cols[7 + i],
                        "precis":cols[22 + i],
                    })
                return
    
    def __iter__(self):
        return self

    def next(self):
        if not self.data or self.itercurrent > (len(self.data)-1):
            raise StopIteration
        
        self.itercurrent += 1
        return self.data[(self.itercurrent -1)]