-Natural-gas prices gained for a third straight session as forecasts for hotter weather drove expectations of higher demand in the coming weeks. Natural gas for October delivery settled up 2.1 cents, or 0.5%, at $4.065 a million British thermal units on the New York Mercantile Exchange, the highest price since July 16. Prices gained 4.7% this week and 5.8% this month. Forecasts are calling for a bout of late-summer heat in the southern and eastern U.S. heading into the first week of September, which is expected to boost demand for gas-powered electricity to run air-conditioning units. “Weather patterns have been more favorable recently” to natural-gas demand, said NatGasWeather.com in a note, but “the end of summer is upon us. …Prices are not looking too far into the future.” Storage data released Thursday showed that stockpiles grew by 75 billion cubic feet in the week ended […]