So, you want to know how is the weather in New York in October. You are in luck. If you are planning a visit to New York City in October, you have picked on of the best months of the year to see the sites. The weather is comfortable with relatively warm days and cool nights â great weather for joining one of our walking tours. Daily temperatures range from about 55f (13C) in the early morning to near 70f (21C) during the afternoon hours early in the month, cooling to 46f (8C) to near 60f (16C) by months end.
1 Coffee drinking in moderation contributes to our fluid intake and does not lead to dehydration or significant loss of body water1,2,3,4,.  Whilst caffeine may have a small diuretic effect, this effect is not strong enough to counter-balance the benefits of fluid intake from coffee drinking.
Yes, staying away from caffeine in coffee, sodas, and tea can help you avoid dehydration. ChaCha again! [ Source: http://www.chacha.com/question/does-iced-tea-dehydrate-you ].