Bluuford can give more accurate forecasts but here you can follow local weather forecasts by yourself.

Five day overview
http://www.foreca.com/Finland/Jyvaskyla

10 days forecast
http://www.foreca.com/Finland/Jyvaskyla?tenday

From Finnish meteorological institute
http://en.ilmatieteenlaitos.fi/weath...forecast=short

As Bluuford said, rainshowers here and there, come and go.
http://en.ilmatieteenlaitos.fi/rain-and-cloudiness