From Tuesday morning and until further notice, the fire risk is high to very high in parts of Dalarna, Västmanland, Gävleborg, Värmland and Uppsala counties, as well as in Dalsland.
The same warning also applies to Gotland County.
During the same time, the risk is high to extremely high in Götaland and the eastern half of Svealand, an assessment that has been in effect since Sunday evening.
SMHI urges caution when lighting fires and using large machinery that can create sparks.
According to the Swedish Civil Contingencies Agency, there are four water-scooping aircraft with 180-minute readiness in Södermanland County on Tuesday.
In Kronoberg and Västmanland counties there are two helicopters each with a 30-minute standby time.
