Weather
Your best bet:
Highly detailed and acurate worldwide wind forecasts are available at wind guru. Register by clicking on "New user" and set the longitude and latitude for Saipan (Latitude: 15° 12' North / Longitude: 145° 45' East) in the "your custom spots" area at the bottom of the page, then go to forcasts, and select the custom spot you've made.
Tide Data:
Tide data for is available at the NOAA/NOS CO-OPS site
The usual suspects:
Naval
Pacific Meteorological and Oceanography Center Joint Typhoon Warning
Center
National
Weather Office, Tiyan, Guam
Angil Design