195 F (91 C) and 205 F (96 C).
Some say that pu-erh tea should be brewed with fully boiling water (which is, as you may remember, 212 degrees Fahrenheit, 100 degrees Celsius, and a presence of very large bubbles and no small bubbles in the pot).  Before we get around to drinking coffee, however, we must first understand the proper temperature that coffee should be brewed at. Brew Coffee Between 195 and 205°F. While coffee may be consumed at a broad range of temperatures, the range for brewing it is relatively narrow. The coffee grounds should be at room temperature, and the water should be between 195 and 205°F. When the water is above 205°F, it can scald the grounds and create a burnt taste. When it’s below 195°F, the brewed coffee will be under-extracted.  If coffee is brewed for too long it will taste bitter. The best level of extraction of coffee is 20% of the solids in the grind. This is achieved by keeping the brew water temperature between 88°C and 93°C. If the temperature of the water is too low, underextraction will occur and the coffee will be too weak. Underextraction will cause the coffee to have a sour flavor, since the acids from the beans are the first substances to dissolve The ideal temperature for brewing coffee is 200 Degrees Fahrenheit. That said, don't get overly concerned about hitting the exact right temperature. Drip brewers have their own thermostats, and some even offer you a choice of more than one brewing temperature. Everyone who is saying that the water temperature needs to be EXACTLY 92 to 96 degrees celcius and shouting for the author to correct his statement that a few degrees difference won't spoil your coffee, should just relax. One approach to the serving temperature of coffee could go like this: For your regular cup of coffee, go for 175ºF, but if you buy some really good coffee beans and want to really taste the coffee and discover all of its flavor notes and qualities, serve it at 150ºF or lower. To you and me that would feel like tepid coffee. But according to him, it’s at that temperature that many of the more subtle flavors of coffee are revealed. What he says makes sense, because if you think about coffee that is really hot, almost hot enough to burn your tongue, you really don’t taste much at all. Brewing Time. The amount of time that the water is in contact with the coffee grounds is another important flavor factor. In a drip system, the contact time should be approximately 5 minutes. If you are making your coffee using a plunger pot, the contact time should be 2-4 minutes. Espresso has an especially brief brew time — the coffee is in contact with the water for only 20-30 seconds. The water you use is very important to the quality of your coffee. Use filtered or bottled water if your tap water is not good or has a strong odor or taste, such as chlorine. If you’re using tap water, let it run a few seconds before filling your coffee pot, and be sure to use cold water. The coffee in a Bunn is brewed at a slightly hotter temperature than that which is in the pot. The thermostat is on the water tank and the water cools to the desired drinking temperature during the brewing process. These machines do not have a vacation setting, and are designed for daily use. Everyone who is saying that the water temperature needs to be EXACTLY 92 to 96 degrees celcius and shouting for the author to correct his statement that a few degrees difference won't spoil your coffee, should just relax. Water Temperature. The brewing temperature of the water used is very important. It should be between 195 F (91 C) and 205 F (96 C). The closer to 205 F (96 C) the better. Boiling water (212 F - 100 C) should never be used, as it will burn the coffee. Water that is less than 195 F (91 C) will not extract properly Though coffee's best brewed at just under boiling temperatures, in about a temperature range from 195 to 205°F, drinking that hot it is another story completely. 
http://coffeetea.about.com/od/teaandtisanebasics/a/TeaBrewingTemperatures.htm https://driftaway.coffee/temperature/ http://hypertextbook.com/facts/2003/DianaGendler.shtml http://www.coffeedetective.com/what-is-the-correct-water-temperature-for-brewing-coffee.html http://www.coffeedetective.com/what-is-the-correct-temperature-for-serving-coffee.html http://www.ncausa.org/About-Coffee/How-to-Brew-Coffee http://www.coffeedetective.com/what-is-the-correct-water-temperature-for-brewing-coffee.html https://www.blackbearcoffee.com/resources/87 http://drinks.seriouseats.com/2013/01/coffee-temperature-how-hot-should-coffee-be.html
what temp should coffee be