A humidistat. (Yes, you can buy them in stores ... try home improvement centers, pet store or gardening centers.)
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If the humidity is high during certain times of the year then a room dehumidifier will help, try to use a floor drain to save you emptying the dehumidifier by hand. If this is due to a problem with an adjacent bathroom then consider installing a ventilator fan in the bathroom.
The high temperatures and humidity made Jack feverish.
One of the better ways would be to use a sling psychrometer.
Like in a Hygrometer to measure humidity you use percentage (%)
Because of the high humidity, the outside temperature felt much warmer than it actually was.