How accurate are the 7 day weather forecasts for farming?

Short range forecasts of 1 to 3 days are quite reliable for temperature and general rain, while the later days of a 7 day forecast are more of a trend than a promise. In simple terms, trust the next 2 to 3 days fairly well for whether to spray, irrigate or delay harvest. Treat days 4 to 7 as a direction, useful for planning but likely to change, so re check the forecast every day or two. Temperature and cold wave or heat wave warnings tend to be more accurate than the exact amount of rain at one village, because monsoon rain is patchy. The way to use this is to make firm short term decisions on the near days, keep flexible plans for the later days, and always update before acting. Following your KVK agromet advisory helps because they combine the forecast with local knowledge. No forecast is perfect, but used this way it clearly reduces risk compared with no forecast at all.