Weather Information Resources
Before venturing off it is always smart to check the weather conditions and expected changes. Here are some websites that have been recommended as having good weather information and resources.Accuweather.com

Nice website, can enter ZIP code for local forecasts.
National Weather Service - Western Region

The NOAA is a government weather resource site, click on the map(s) to zoom in and get a forecast for a specific area.
Weather Underground

Nice site, you can zoom in to specific locations using zip codes or other keys, provides hour by hour forecasts of precipitation, temperature and winds.
Golden Gate Weather- Forecasting

This is a "do it yourself" forecasting page with links to various weather resources. This is from a site maintained by a professional meterologist.
Weather.com

A commercial weather information website.
Historical Weather Data

Here is a U.S. government website with database of weather data by weather station. It is somewhat hard to use. It can be used to see what "normal" temps are for a place at a specific date range.
If you have suggestions for other weather resources, please let us know.