I.R. of Iran Meteorological Organization - Government agency provides forecasts and information on weather, climate, air quality and the environment. [English, Farsi] - http://www.weather.ir/
NOAA NWS - Iran Weather - US government site provides hour-by-hour weather conditions for the past 24 hours for major cities and locations in the country. - http://weather.noaa.gov/weather/IR_cc.html
BBC Weather Centre - Country Guides: Iran - Provides climate and weather information, facts and statistics about the country, along with five-day forecasts for major cities. - http://www.bbc.co.uk/weather/world/country_guides/results.shtml?tt=TT002390
Weather Underground - Iran - Displays current conditions for all major cities on one page, with five-day forecast and more detailed information for each available. - http://www.wunderground.com/global/IR.html
The Climate of Iran - Describes the climate of the northern, southern, desert and mountainous regions of Iran. Article by Parviz Kardovani, professor of geography at the University of Tehran. - http://www.netiran.com/?fn=artd(1765)
WeatherHub - Iran - Links to forecasts for cities and airports from various weather sources. - http://www.weatherhub.com/global/ir.htm