Keeping an umbrella close may be the best idea on Friday as the region is set for likely 'severe thunderstorms' in the afternoon, according to the Bureau of Meteorology.
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The bureau has forecasted a very high chance of rain (90 per cent) with the chance of a thunderstorm during this afternoon and evening, with possible heavy falls.
Between 10mm and 20mm could fall, however the downpours could be sporadic.
Some moderate rain has already begun to fall near Daylesford around 8am.
This comes after a relatively mild start to the month in Ballarat, with only a handful of days of rain so far, two of which registered more than 1.4 millimetres.
Showers are expected to continue across the weekend, with the BOM predicting small amounts of rain on both Saturday and Sunday.
The BOM is also predicting Friday to be potentially the hottest day of the month in Ballarat, with a maximum temperature of 30 degrees forecasted.
It has been a relatively mild final month of summer to date, with the maximum temperature averaging just 23.7 degrees.
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