1. Check the grass for dew at sunrise.
2. Remember the rhyme: “Red sky at night, sailor’s delight; Red sky at morning, sailors take warning.”
3. Look for a rainbow in the west.
4. Detect which direction the wind is blowing.
5. Take a deep breath.
6. Check for humidity.
7. Watch the clouds.
8. Observe animals.
9. Make a campfire. 
10. Look at the moon during the night.
11. Create your own prediction methods.
12. Look for pine cones

via dominica-weekly