NHDES rolled out a new platform for displaying their data. If you head to
this link, click observations on the left menu, zoom to Winni, click the Weirs Beach Station (WEIN3) and then change the dropdown on the right menu from observed reservoir pool elevation to water temp, you should find the info that you are looking for. LWA also posts a
weekly report card with water temp and lake level.
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The Lake Winnipesaukee Alliance (LWA) is a non-profit organization dedicated to protecting the water quality and natural resources of Lake Winnipesaukee and its watershed. Through monitoring, education, stewardship, and science guided approaches for lake management, LWA works to ensure Winnipesaukee’s scenic beauty, wildlife habitat, water quality and recreational potential continues to provide enjoyment long into the future.
http://www.winnipesaukee.org/