[3] Evidence of prehistoric settlements at Wynau include; individual Bronze Age items along the Aare river, the remains of a Roman manor at Hoferrain-Birchi and a sunken Roman ship with a rudder in the Aare.

[3] During the 13th and 14th centuries, the main landholders were the local nobles, the Lord of Bechburg, the Count of Falkenstein and the Knight of Aarwangen.

With that foothold, in 1413 Bern negotiated an agreement with St. Urban's which brought Wynau and the upper Murgenthal (Murg valley) under Bernese control.

The late-Romanesque basilica church was probably built in the 10th–11th century, on top of an older Carolingian building.

During the Late Middle Ages it was the center of a deaconate within the Diocese of Constance which included the villages of Aarwangen (until 1577), Roggwil (until 1664) and Murgenthal (settlements of Balzenwil, Gruben and Walliswil until 1664, Riken and Glashütten until 1824).

[3] Bern built a salt warehouse in the municipality, followed by a customs house on the border with the Canton of Aargau in 1800.

During the 18th century, cottage industry cotton weaving and coal mining began to supplement agriculture in the local economy.

It consists of the village sections of Dorf, Ägerten, Hubel, Birch and Einschlag and the hamlets of Ober-Wynau und Ober-Murgenthal.

[6] The blazon of the municipal coat of arms is Argent a grape Azure slipped and leaved Vert.

This may be an example of canting with the grapes symbolizing wine (German: Wein) which is pronounced similar to Wynau.

[10] Most of the population (as of 2000[update]) speaks German (1,416 or 89.4%) as their first language, Albanian is the second most common (67 or 4.2%) and Italian is the third (35 or 2.2%).

[15] In 1894–96, the first hydroelectric power station on the river Aare was built at Wynau by the German company Siemens & Halske.

It was only then that Wynau began to buy electric energy from the power station located on its territory.

The number of jobs in the primary sector was 24, of which 22 were in agriculture and 2 were in forestry or lumber production.

In the tertiary sector; 212 or 36.1% were in wholesale or retail sales or the repair of motor vehicles, 11 or 1.9% were in the movement and storage of goods, 52 or 8.9% were in a hotel or restaurant, 10 or 1.7% were the insurance or financial industry, 72 or 12.3% were technical professionals or scientists, 52 or 8.9% were in education and 86 or 14.7% were in health care.

[10] From the 2000 census[update], 240 or 15.2% were Roman Catholic, while 985 or 62.2% belonged to the Swiss Reformed Church.

This is followed by three years of obligatory lower Secondary school where the students are separated according to ability and aptitude.

Following the lower Secondary students may attend additional schooling or they may enter an apprenticeship.