The most common and most likely answer to this crossword clue is the 8 letter word CLIMATIC
I've seen this crossword clue in The Times
C
L
I
M
A
T
I
C
More clues leading to the result CLIMATIC
- Outlandish claim Mark heard about the weather
- Relating to the elements, reaching exciting conclusions once carbon’s extracted
- Weather-wise, an incoming cold front would make it exciting
- Like the weather, boiling up but not cold inside
- Like the weather at the end, not a little cold
- Cold capital city, almost in reverse of prevailing conditions
- Claim nervous tic is weather related
- Crossing Pacific, Lima ticket-holders depending on the weather
Buddy explains!

The straight part
We know that "about the weather" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case about the weather = climatic.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 CLIMATIC mean?
CLIMATIC adjective- Of, relating to or influenced by climate.