Wimmis is located between the Simmenfluh and Burgfluh rivers at the entrance to the Simmental.
 The municipal borders stretch up the flank of the Niesen mountain to its peak at 2,362 meters (7,749 ft).
 It consists of the village of Wimmis and the settlements of Oberdorf, Brodhüsi, Hasli and Burgholz.

The municipality has an area of 22.35 km² (8.63 sq mi).
 As of 2012, a total of 6.46 km² (2.49 sq mi) or 28.9% is used for agricultural purposes, while 10.5 km² (4.1 sq mi) or 47.0% is forested.
  The rest of the municipality is 1.71 km² (0.66 sq mi) or 7.7% is settled (buildings or roads), 0.35 km² (0.14 sq mi) or 1.6% is either rivers or lakes and 3.31 km² (1.28 sq mi) or 14.8% is unproductive land.

During the same year, industrial buildings made up 1.6% of the total area while housing and buildings made up 2.8% and transportation infrastructure made up 2.0%.
 Power and water infrastructure as well as other special developed areas made up 1.1% of the area  A total of 43.3% of the total land area is heavily forested and 2.4% is covered with orchards or small clusters of trees.
 Of the agricultural land, 5.4% is used for growing crops and  14.9% is pasturage and 8.1% is used for alpine pastures.
 All the water in the municipality is flowing water.
 Of the unproductive areas, 8.2% is unproductive vegetation and 6.7% is too rocky for vegetation.

On 31 December 2009 Amtsbezirk Niedersimmental, the municipality's former district, was dissolved.
 On the following day, 1 January 2010, it joined the newly created Verwaltungskreis Frutigen-Niedersimmental.
Wimmis is located between the Simmenfluh and Burgfluh rivers at the entrance to the Simmental.  The municipal borders stretch up the flank of the Niesen mountain to its peak at 2,362 meters (7,749 ft).  It consists of the village of Wimmis and the settlements of Oberdorf, Brodhüsi, Hasli and Burgholz.
The municipality has an area of 22.35 km² (8.63 sq mi).  As of 2012, a total of 6.46 km² (2.49 sq mi) or 28.9% is used for agricultural purposes, while 10.5 km² (4.1 sq mi) or 47.0% is forested.   The rest of the municipality is 1.71 km² (0.66 sq mi) or 7.7% is settled (buildings or roads), 0.35 km² (0.14 sq mi) or 1.6% is either rivers or lakes and 3.31 km² (1.28 sq mi) or 14.8% is unproductive land.
During the same year, industrial buildings made up 1.6% of the total area while housing and buildings made up 2.8% and transportation infrastructure made up 2.0%.  Power and water infrastructure as well as other special developed areas made up 1.1% of the area  A total of 43.3% of the total land area is heavily forested and 2.4% is covered with orchards or small clusters of trees.  Of the agricultural land, 5.4% is used for growing crops and  14.9% is pasturage and 8.1% is used for alpine pastures.  All the water in the municipality is flowing water.  Of the unproductive areas, 8.2% is unproductive vegetation and 6.7% is too rocky for vegetation.
On 31 December 2009 Amtsbezirk Niedersimmental, the municipality's former district, was dissolved.  On the following day, 1 January 2010, it joined the newly created Verwaltungskreis Frutigen-Niedersimmental.
Wimmis