Where can I get aviation weather information?
NOAA collects METARs (current weather) from all over the world and publishes them at http://weather.noaa.gov/pub/data/observations/metar/stations/.

They also collect TAFs (forecasts) and publish them at http://weather.noaa.gov/pub/data/forecasts/taf/stations/.

These reports are what the information told to pilots by controllers or broadcast in ATIS is based on, written in shorthand format designed for efficient transmission over teletype. If you look around the directory structure, there are also decoded versions.

The above links are complete, but intended more for machine consumption, being plain text files. You'll find many other sources that look more like normal web pages if you google for some airport code and “METAR” or “TAF”, but different parts of the world will be available at different places. The above links are most comprehensive source.