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Sorry if this is a dumb question... yes I did check the weather reports... I haven't worn a jacket in two years (Southern California) and I'm wondering if I should buy one before I leave tomorrow. I asked my Mom and she doesn't know either :)
Weather:
Thurs - Mon, Sep 18 - 22:
highs between 21 C and 24 C
lows between 11 C and 15 C
Tue - Wed, Sep 23 - 24
highs: 18 C
lows: 11 C
A 5 day forcast for London here [bbc.co.uk] and it is getting quite chilly in the evenings now. If you have a sweater that keeps you warm at 10/50 you'll be ok.
It looks like no rain either - yipeeeeeeee