Hello.
In literature or films you often see a rainy weather/storm after a big battle (be it a medieval era one or a WW2 era one), so I was curious if there is any mention in historical books about the matter or is it just something authors wrote to emphasise the sad mood, instead of writing about how warm summer rays caressed the faces of the dead soldiers on the battlefield. It would kinda make sense if the nature didn't really care, but if there is a big battle going on with plenty of smoke and dust rising, I imagine the weather would perhaps be somewhat influenced by the matter (I could be wrong, of course).
I don't really have a particular battle to ask for as an example (kinda hard to pinpoint one too, just battles in general), but if anyone ever noticed anything like this in the historical books, I would appreciate the answer. The location would be preferably Europe (perhaps not exactly a region that has rain all the time). Thank you for your answers.
In his life of Marius, Plutarch (45-120) says that 'it is observed indeed, that extraordinary rains generally fall after great battles' which a pretty long history for the literary tradition anyway. There does seem to be a bit of a difference as Plutarch seems to be saying that the rain the following winter was particularly heavy, rather than the next day, but it seems to have been used as support for the idea that you're talking about, rain the next day. While trying to find a version of the quote online I came across a few sources of 19th century people who believed this, and sometimes tried to test it (1 2 3 if you're interested) but I don't think it was ever very mainstream. I don't really have the science background to tell you whether it's possible or not, but I would be particularly sceptical of the idea that pre-modern battles could have an effect on the weather (and even 19th century ones don't seem terribly likely either).