The city is located in south-western Bulgaria, in the Struma river valley, at an altitude between 200 and 300 meters (650 and 1,000 feet). We are near the border with Greece and northern Macedonia, in an area relatively mild in winter and particularly hot in summer. Unlike in the rest of Bulgaria, even in winter there is a fair number of sunny days.
, there are some mild periods, with highs of 15 °C (59 °F) and more. However, there can also be cold periods, characterized by snowfalls, and even cold waves, during which the temperature can drop to as low as -15 °C (5 °F). The coldest record is -21 °C (-6 °F), recorded in January 1963.
The city is particularly exposed to heat waves. In the hottest periods, the temperature can reach 38/40 °C (100/104 °F). The record heat is 44.5 °C (112 °F), recorded in July 2007. In July 2007 and in July 2012, the average maximum was 37 °C (98.5 °F). In early September 2015, the temperature reached 39 °C (102 °F).
to visit Sandanski are spring and autumn, namely from mid-May to mid-June, a period when some afternoon thunderstorms must be put into account, and from mid-September to mid-October, a period a bit cooler but also drier. In summer, the heat is sometimes bearable, while at other times, especially in July and August, it can be intense.
. Here are the average temperatures.
January, the coldest month of the year, is generally a cold month. The average temperature is of
3.6 °C, with a minimum of
-0.6 °C and a maximum of
7.8 °C.

On the coldest nights of the month, the temperature usually drops to around
-8.5 °C. However, it dropped to
-16.1 °C in January 2017.

On the warmest days of the month, the temperature usually reaches around
15 °C. However, it reached
18.7 °C in January 2007.

Precipitation amounts to
40 mm, distributed over 6 days.
The day lasts on average 9 hours and 35 minutes.

There are on average 4 hours of sunshine per day. So, the sun shines 43% of the time.
The average humidity is 76%. Hence, the air is normally humid.
February is generally a quite cold month. The average temperature is of
6 °C, with a minimum of
1 °C and a maximum of
10.9 °C.

On the coldest nights of the month, the temperature usually drops to around
-6 °C. However, it dropped to
-13.9 °C in February 1991.

On the warmest days of the month, the temperature usually reaches around
18.5 °C. However, it reached
22.8 °C in February 2004.

Precipitation amounts to
35 mm, distributed over 6 days.
The day lasts on average 10 hours and 35 minutes.

There are on average 5 hours of sunshine per day. So, the sun shines 48% of the time.
The average humidity is 73%. Hence, the air is normally humid.
March is generally a mild month. The average temperature is of
9.8 °C, with a minimum of
4.1 °C and a maximum of
15.4 °C.

On the coldest nights of the month, the temperature usually drops to around
-2.5 °C. However, it dropped to
-8.1 °C in March 2018.

On the warmest days of the month, the temperature usually reaches around
23.5 °C. However, it reached
26.2 °C in March 2014.

Precipitation amounts to
45 mm, distributed over 7 days.
The day lasts on average 12 hours and 0 minutes.

There are on average 6 hours of sunshine per day. So, the sun shines 52% of the time.
The average humidity is 68%.
April is generally a mild month. The average temperature is of
14.2 °C, with a minimum of
8.1 °C and a maximum of
20.3 °C.

On the coldest nights of the month, the temperature usually drops to around
1.5 °C. However, it dropped to
-6.5 °C in April 2003.

On the warmest days of the month, the temperature usually reaches around
27 °C. However, it reached
31.6 °C in April 2013.

Precipitation amounts to
45 mm, distributed over 6 days.
The day lasts on average 13 hours and 25 minutes.

There are on average 7 hours of sunshine per day. So, the sun shines 54% of the time.
The average humidity is 63%.
May is generally a warm month. The average temperature is of
19.2 °C, with a minimum of
12.8 °C and a maximum of
25.7 °C.

On the coldest nights of the month, the temperature usually drops to around
7.5 °C. However, it dropped to
1.8 °C in May 1995.

On the warmest days of the month, the temperature usually reaches around
32 °C. However, it reached
36 °C in May 2008.

Precipitation amounts to
50 mm, distributed over 8 days.
The day lasts on average 14 hours and 35 minutes. So the days are long.

There are on average 8.5 hours of sunshine per day. So, the sun shines 59% of the time.
The average humidity is 63%.
June is generally a warm to hot month. However, there are remarkable differences between night and day. The average temperature is of
23.6 °C, with a minimum of
16.7 °C and a maximum of
30.5 °C.

On the coldest nights of the month, the temperature usually drops to around
11.5 °C. However, it dropped to
5.9 °C in June 1996.

On the warmest days of the month, the temperature usually reaches around
37 °C. However, it reached
42.1 °C in June 2017.

Precipitation amounts to
50 mm, distributed over 6 days.
The day lasts on average 15 hours and 5 minutes. So the days are long. June 21, the summer solstice, is the longest day of the year in the Northern Hemisphere.

There are on average 10.5 hours of sunshine per day. So, the sun shines 69% of the time.
The average humidity is 60%.
July is generally a warm to hot month. However, there are remarkable differences between night and day. The average temperature is of
26.1 °C, with a minimum of
19 °C and a maximum of
33.3 °C.

On the coldest nights of the month, the temperature usually drops to around
14.5 °C. However, it dropped to
10.9 °C in July 1998.

On the warmest days of the month, the temperature usually reaches around
38.5 °C. However, it reached
44.6 °C in July 2007.

Precipitation amounts to
40 mm, distributed over 5 days.
The day lasts on average 14 hours and 50 minutes. So the days are long.

There are on average 11.5 hours of sunshine per day. So, the sun shines 76% of the time.
The average humidity is 56%.
August, the hottest month of the year, is generally a warm to hot month. However, there are remarkable differences between night and day. The average temperature is of
26.3 °C, with a minimum of
19 °C and a maximum of
33.6 °C.

On the coldest nights of the month, the temperature usually drops to around
14.5 °C. However, it dropped to
11.2 °C in August 1995.

On the warmest days of the month, the temperature usually reaches around
38.5 °C. However, it reached
42.5 °C in August 2012.

Precipitation amounts to
30 mm, distributed over 3 days.
The day lasts on average 13 hours and 50 minutes.

There are on average 10.5 hours of sunshine per day. So, the sun shines 77% of the time.
The average humidity is 56%.
September is generally a warm month. However, there are remarkable differences between night and day. The average temperature is of
21.3 °C, with a minimum of
14.7 °C and a maximum of
27.9 °C.

On the coldest nights of the month, the temperature usually drops to around
9.5 °C. However, it dropped to
4.5 °C in September 2018.

On the warmest days of the month, the temperature usually reaches around
34.5 °C. However, it reached
39 °C in September 2015.

Precipitation amounts to
40 mm, distributed over 5 days.
The day lasts on average 12 hours and 25 minutes.

There are on average 8.5 hours of sunshine per day. So, the sun shines 68% of the time.
The average humidity is 60%.
October is generally a very mild month. The average temperature is of
15.6 °C, with a minimum of
10 °C and a maximum of
21.3 °C.

On the coldest nights of the month, the temperature usually drops to around
3 °C. However, it dropped to
-0.6 °C in October 2010.

On the warmest days of the month, the temperature usually reaches around
28.5 °C. However, it reached
33.5 °C in October 2012.

Precipitation amounts to
55 mm, distributed over 5 days.
The day lasts on average 11 hours and 0 minutes.

There are on average 6 hours of sunshine per day. So, the sun shines 56% of the time.
The average humidity is 68%.
November is generally a mild month. The average temperature is of
9.7 °C, with a minimum of
5 °C and a maximum of
14.5 °C.

On the coldest nights of the month, the temperature usually drops to around
-2 °C. However, it dropped to
-7 °C in November 1995.

On the warmest days of the month, the temperature usually reaches around
22 °C. However, it reached
27.1 °C in November 2018.

Precipitation amounts to
45 mm, distributed over 6 days.
The day lasts on average 9 hours and 50 minutes.

There are on average 4.5 hours of sunshine per day. So, the sun shines 46% of the time.
The average humidity is 76%. Hence, the air is normally humid.
December is generally a quite cold month. The average temperature is of
4.6 °C, with a minimum of
0.6 °C and a maximum of
8.5 °C.

On the coldest nights of the month, the temperature usually drops to around
-6.5 °C. However, it dropped to
-16.2 °C in December 2001.

On the warmest days of the month, the temperature usually reaches around
16 °C. However, it reached
22.9 °C in December 2010.

Precipitation amounts to
55 mm, distributed over 8 days.
The day lasts on average 9 hours and 10 minutes. December 21, the winter solstice, is the shortest day of the year in the Northern Hemisphere.

There are on average 3.5 hours of sunshine per day. So, the sun shines 39% of the time.
The average humidity is 79%. Hence, the air is normally humid.