Weather by name
When is it t-shirt weather?
T-shirt weather is usually 65°F (18°C) and up in the sun, or about 70°F in the shade.
Get roasted by your own forecastFree, no account, and you pick how rude I get.
More on t-shirt weather
A t-shirt on its own is comfortable when you are not losing heat faster than you make it. Sun can add the feel of several degrees; wind takes them away just as quickly.
Below about 60°F, most people want a layer over it, at least once the sun goes down.
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What I think of t-shirt weather
T-shirt weather: the moment the jacket goes from essential to something you carry around resentfully.
T-shirt weather lasts until the sun goes behind one cloud.
T-shirt weather in March is optimism. In July it is survival.