It’s not the heat but the humidity that gets you, at least that’s what they say. Really, both are important, what you need is a sensor that combines humidity and temperature readings. How about this Honeywell HumidIcon Digital Humidity/Temperature Sensor?
The HIH6130 is a digital output-type relative humidity (RH) and temperature sensor combined in the same package. This allows the RH measurement to be temperature compensated and provides a second, standalone temperature sensor output.
This breakout board gives you standard 0.1″ spaced headers for each of the pins on this SOIC package, making it a lot easier to prototype your next humidity-sensing application. Communication with the HIH6130 is easily achieved over I2C using libraries like “Wire.h”
* Operating Voltage: 2.3-5.5v
* Compensated humidity range: 10-90% RH
* Compensated temp. range 5-50°C
* True temperature-compensated digital I2C output
* Wide operating temperature range allows for use in many applications
* [Eagle Files](http://cdn.sparkfun.com/datasheets/Sensors/Weather/HIH6130_Breakout_v10.zip)
* [Datasheet](http://cdn.sparkfun.com/datasheets/Prototyping/1443945.pdf) (HIH6130)
* [Hygrometer Reconditioning Note](http://cdn.sparkfun.com/datasheets/Sensors/Weather/Hygrometer_ReCon.pdf)
* [Arduino Code](http://www.phanderson.com/arduino/hih6130.html)
* [I2C Instructions](http://www.phanderson.com/arduino/I2CCommunications.pdf)
* [Entering and Using Command Mode](http://www.phanderson.com/arduino/CommandModeInstructions.pdf)
* [GitHub](https://github.com/sparkfun/HIH6130_Breakout) (Design Files)