Show indian summer indian summer usually be beins begins ins some time in october but it ma may not begin until november according to the united states weather bureau it ts Is not a definite period occurring reg nearly each autumn and Is not basei base on accurate meteorological data indian summer varies greatly to in duration it may occur once or several umes times during the fall and early winter or it may not occur at all and if it does it may last a day or two or several weeks and in sone some years there are more than one of these periods of hazy tranquil days |