Examine the clouds
The types of clouds in the sky, as well as the direction in which they’re moving, can tell you a lot about upcoming weather. In general, clouds that are white and high indicate good weather, and clouds that are dark and low mean rain or storms are on the way.
Look for a red sky
Remember the rhyme: „Red sky at night, sailor’s delight; Red sky at morning, sailors take warning.“ Look for any sign of red in the sky (not a red sun); it will not be a bold orange or red the majority of the time, but that depends a little on where you live.
Look for a rainbow in the west
This is the result of the rising sun’s morning rays from the east striking moisture in the west. Most major storm fronts in the Northern Hemisphere travel west to east, and a rainbow in the west means moisture, which can mean rain is on its way. On the other hand, a rainbow in the east around sunset means that the rain is on its way out and you can look forward to sunny days. Remember: Rainbow in the morning, need for a warning.
Gaze at the moon
If it is reddish or pale, dust is in the air. But if the moon is bright and sharply focused, it’s probably because low pressure has cleared out the dust, and low pressure means rain.
A ring around the moon (caused by light shining through cirrostratus clouds associated with warm fronts and moisture) can indicate that rain will probably fall within the next three days.
Remember the proverb: Circle around the moon, rain or snow soon.
Thanks to wikihow