At Bern's main railway station take the western ascent "Welle" to the Schanzenbrücke bridge. BERNMOBIL's bus stop Schanzenstrasse is on the opposite side of the road you reach. Take bus number 20 to the Länggasse terminus. Fabrikstrasse starts opposite the terminus. After five minutes walk you will see the Meteotest building on the right.
On the A1 motorway Bern-Lausanne, take the Bern-Forsthaus exit in the direction of "Zentrum/Bahnhof". At the second traffic light turn left into Fabrikstrasse. The Meteotest building is located after about 200 m on the left side of the street.