Thermocouple amplifier is an outstanding analog-output amplifier that is easy to use.
This pressure sensor from Freescale is a great low-cost sensing solution for precision measurement of barometric pressure and altitude.
BMP180 is a Barometric Pressure Sensor Breakout Board that can be easily interfaced with Arduino.
This is an evaluation board for the MLX90614 IR Thermometer.
Now mounted on a breakout board, the MPL115A1 is a digital barometer that uses MEMs technology to give accurate pressure measurements between 50kPa and 115kPa.
This is a pre-wired and waterproofed version of the DS18B20 sensor.
This is a breakout board for the Bosch BMP180 high-precision, low-power digital barometer.
The Weather Shield is an easy to use Arduino shield that grants you access to barometric pressure, relative humidity, luminosity and temperature.
This product is a high accuracy temperature and humidity sensor used in home conditions.
Whether you're an agriculturalist, a professional meteorologist or a weather hobbyist, building your own weather station can be a really rewarding project.
This is a breakout board for the incredibly small TMP102 digital temperature sensor. The TMP102 is a digital sensor (I2C a.k.a. TWI), has a resolution of 0.0625°C, and is accurate up to 0.5°C. This is a very handy sensor that requires a very low-current.
This is a breakout board for Honeywell's HIH-4030 humidity sensor. The HIH-4030 measures relative humidity (%RH) and delivers it as an analog output voltage.