The most common and most likely answer to this crossword clue is the 5 letter word SKIES
I've seen this crossword clue in The Guardian
S
K
I
E
S
More clues leading to the result SKIES
Buddy explains!

The straight part
We know that "weather forecasters" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case weather forecasters = skies.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does SKIES mean?
SKIES noun- The atmosphere above a given point, especially as visible from the ground during the day.
- The part of the sky which can be seen from a specific place or at a specific time; its condition, climate etc.
- Heaven.
- (theoretical physics) The set of all lightlike lines (or directions) passing through a given point in space-time.
- In an art gallery, the upper rows of pictures that cannot easily be seen.
- A cloud.
- To hit, kick or throw (a ball) extremely high.
- To clear (a hurdle, high jump bar, etc.) by a large margin.
- To hang (a picture on exhibition) near the top of a wall, where it cannot be well seen.
- To drink something from a container without one's lips touching the container.
- A vibrant light blue colour, like that of the sky on a fine day.
- To move on skis
- To travel over (a slope etc.) on skis; to travel on skis at (a place), (especially as a sport)