Saturn Combust December 2018 – January 2019, Effects

Saturn will be within 15° of Sun during 15 December 2018, 17:19 IST – 19 January 2019, 02:34 IST, while transiting Sagittarius (Dhanus Rasi).
During these 34 days Mercury will also be conjunct Sun-Saturn, and will be combust from 06 January till 17 February 2019. Saturn Combust 2018-19

As per traditional Vedic Astrology, Saturn being combust is not given much importance, as it is not a natural benefic and never considered for auspisicious events.
Only Natural Benefics like Jupiter, Venus, Moon are considered and they should not be combust while planning a Muhurtha. If transiting through evil sign, during combustion, Saturn becomes more harsh and creats troubles at work, health and family.
For example : Saturn transiting 8th house for Taurus Moon Sign and Ascendant is dangerous when it is combust and conjunct other planets.
If you are undergoing Saturn Mahadasa or Antardasa, or if Saturn is one of the Ruling planets at birth time (Being born with Moon in Pushyami, Anuradha, Uttara Bhadrapada nakshatras or born with Moon in Capricorn/Makara Rasi or Lagna, Aquarius/Kumbha Rasi or Lagna, or born on a Saturday), then you will be drawn into unnecessary conflicts and quarrels, spouse and children are afflicted and accidents are possible.
Combustion of Saturn will burn the sins attributed to adharma you did in the past life by forcing you to serve elders and father in this life (This is more applicable if born during Saturn Combustion period).

Saturn Combust 2018-19, Effects on 12 Moon Signs

Aries (Mesha Rasi) : There will be few forced issues at work. Better take a break and visit religious places to avoid job pressure. Health of a elder at home can suffer. Legal issues will not be in your favor.

Taurus(Vrishabha Rasi) : Parents health and kids behaviour will be a cause of concern. Financial tensions, lack of confidence, fear for unknown reasons, insomnia, indigestion can occur.

Gemini (Mithuna Rasi) : Problems in marriage and married life. All wedding plans must be postponed. Loneliness will haunt you. Missed oppurtunities in past can make you repent.

Cancer (Karka Rasi) : Time for a routine health checkup. Food poisoning possible while dining out. If changed job recently, new place will be more entertaining and rewarding.

Leo (Simha Rasi) : Pressure in family, finance, relationships indicated. Few can even struggle for day to day needs. Health will not be good. Busy schedule does not generate additional income.

Virgo (Kanya Rasi) : Strained relations with mother. Domestic harmony is disturbed. Pressure of debts, attack from enemies, health issues are possible. Professional strategies will fail to give satisfactory results.

Libra (Thula Rasi) : Stay away from anti-socil activities. Even smallest crime can lead to biggest punishment. Siblings will not cooperate and confidence can go down.

Scorpio (Vrischik Rasi) : Sudden expenses can put you in a financial crunch position. Health of a kid or family member due to their negligence will keep you busy. Do not get involved in loose talks and gossips.

Sagittarius (Dhanus Rasi) : Effects of Pitru dosha can be seen within family. Chronic or hereditary diseases will comeback. Freelancers, businessmen can face some setbacks.

Capricorn (Makara Rasi) : You will wander aimlessly and remain neglected at home. Fatigue, nervous weakness, bad relations with younger ones, insults can be experienced. Kids will either disagree or travel away from you. Health of spouse will remain adverse.

Aquarius (Kumbha Rasi) : This is good except for those suffering from chronic diseases or women undergoing pregnancy. Avoid abortions, surgeries. Do not spend money on gold and jewelery.

Pisces (Meena Rasi) : You will get a much deserved break from strained work. Traveling abroad or long distance within the country is possible for many. Road trips, flights can be tiresome but destinations will be worth the strain. If involved in criminal or illegal activities, you may have to flee from home town.