Depending where you are (city) there will be breaks in the hot water service whilst they get ready for the oncoming winter, often, you will not receive notice of this and you will wake at 0600hrs to shower and find the water freezing cold.
This can continue for up to 7 days at a time and unless you have someone in your block that you can speak with (or NIS person) you will be left guessing.
The city or rayon (suburb) wide central heating for the batterias (radiators) in your apartment should probably be on by early October, although this varies from region to region depending. In Ust-Kamenogorsk, it comes on (or should do) earlier (we are in the coldest region), the western and southern regions tend to be warmer.