ForecastFox for Chrome and Firefox gives you up-to-date weather info, including international, provided by AccuWeather.com right to your desktop.

You have many customizable options to choose from and all can be displayed in any toolbar or status bar. You can also utilize the interchangeable weather icons, auto-switch between previous locations at predetermined intervals, use the multiple toolbar display options which include severe weather alerts, radar (or satellite), link to hourly or 5-day forecast, current conditions, days or nights and the number of forecast days. You also have the ability to tailor the exact type weather data you receive, such as humidity, precipitation, UV, visibility, and more.

You also can use ForecastFox with Thunderbird and SeaMonkey as well - never guess the weather again.