Vision: Dreaming about chamomile: you are about to get a cold. Collecting chamomile in the garden: you will get sick but recover soon. Applying a chamomile poultice: your pain will soon be lessened.... Dreamers Dictionary
Because a thermometer measures your temperature, its appearance in a dream may comment on your tendency to be hotheaded or point out that you are heated up about an event or situation in your life. It may also signify the need to diagnose an illness.... Ariadne's Book of Dream
Vision: If you are reading your temperature on a thermometer: the thermometer shows your present emotional state: passionate, dynamic people have a high temperature, calm people have a medium temperature, and very sensitive, soft-hearted people may feel cold.... Dreamers Dictionary
If you dream of a thermometer then your body might be literally too hot or too cold. Also, a thermometer could signify degrees of separation between you and someone you love. Your dream might be showing you where you’ve gotten out of balance, and where it might be appropriate for you to heat things up in your life, or to take time to chill out. See Hot or Cold.... Strangest Dream Explanations
This dream could be a warning of your physical state: You may be cold and have a fever. But it could also signify that your temperature, metaphorically speaking, is too high; perhaps due to attraction that you feel for someone.
It is also possible that the presence of a thermometer in dreams reflects a concern with determining specific facts, or perhaps it alludes that you are trying to “take the temperature” of some new project or idea that you have in mind. On the other hand, you should not forget that the thermometer contains mercury, so it may be interesting to investigate the role of this god in Roman mythology or the influence of the planet in astrology.... The Big Dictionary of Dreams