Climate in Iranshahr (Iran)

The climate of Iranshahr is subtropical desert (according to the Köppen classification, hot desert climate - BWh), with very mild winters and very hot, sunny summers. Precipitation is decidedly scarce, just above 100 millimeters (4 inches) per year.
Iranshahr (formerly Pahrah) is a city of 115,000 inhabitants located in the south-east of Iran, in the province of Sistan and Baluchestan, at 550 meters (1,800 feet) above sea level and at 27 degrees north latitude.

Winter, from December to February, is very mild, so much so that the average in January is 15 °C (59 °F). Rainfall is rare even in this season. Unlike other inland zones of Iran, we are in an area sheltered from cold waves and snowfall.
However, there can be periods of cool weather from time to time, when the temperature drops below 5 °C (41 °F) at night, and remains around 10/12 °C (50/54 °F) during the day. Occasionally it can also drop below freezing. In December 1994, it dropped to -3.3 °C (26 °F). In January 2008, there was a rainy day with a maximum of 6 °C (43 °F).

Summer, from June to August, is very hot, although the humidity is low and the wind blows regularly. Despite the altitude, the average temperature, almost 38 °C (100.5 °F) in July, makes Iranshahr one of the hottest cities in the world. However, unlike what happens in the province of Khuzestan, here the temperature does not exceed 50 °C (122 °F). In July 2024 it reached 48.9 °C (120 °F), and there were two days with a minimum of 36 °C (97 °F).
In summer, this southeastern part of Iran is marginally affected by the monsoon, so there may be some cloudiness and thunderstorms. However, the average amount of rainfall is very low.

Occasionally, the area can be affected by tropical cyclones (which usually pass further south, over the Arabian Peninsula, or hit Pakistan, further east), as happened with Cyclone Gonu in early June 2007. Since the city is far from the coast, strong winds are unlikely to arrive, but there can be heavy rainfall.
Cyclones form from May to November, and are more frequent at the beginning of the period (May-June), and a little less so at the end (October-November).

Iranshahr - Climate data

In Iranshahr, the average temperature of the coldest month (January) is of 15 °C (58.9 °F), that of the warmest month (July) is of 37.8 °C (100 °F). Here are the average temperatures.
Precipitation amounts to 105 millimeters (4.1 inches) per year: it is therefore at a desert level. It ranges from 0.8 mm (0 in) in the driest month (September) to 21.2 mm (0.8 in) in the wettest one (January). Here is the average precipitation.
There are on average around 3410 sunshine hours per year. Here are the average hours of sunshine per day.

Iranshahr - Weather by month

Based on the period 1991-2020

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January, the coldest month of the year, is generally a very mild month. The average temperature is of 15 °C (59 °F), with a minimum of 8.5 °C (47.3 °F) and a maximum of 21.4 °C (70.5 °F).
On the coldest nights of the month, the temperature usually drops to around 2.5 °C (36.5 °F). However, it dropped to -1 °C (30.2 °F) in January 2006.
On the warmest days of the month, the temperature usually reaches around 27 °C (80.5 °F). However, it reached 31 °C (87.8 °F) in January 2019.
Precipitation amounts to 21.2 mm (0.8 in), distributed over 2 days.
The day lasts on average 10 hours and 35 minutes.
There are on average 8 hours of sunshine per day. So, the sun shines 76% of the time.
The average humidity is 41%.
The average wind speed is 7 kph (5 mph).

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February is generally a very mild month. However, there are remarkable differences between night and day. The average temperature is of 17.6 °C (64 °F), with a minimum of 11.1 °C (52 °F) and a maximum of 24.2 °C (75.6 °F).
On the coldest nights of the month, the temperature usually drops to around 3.5 °C (38.5 °F). However, it dropped to -1 °C (30.2 °F) in February 2008.
On the warmest days of the month, the temperature usually reaches around 30.5 °C (87 °F). However, it reached 37 °C (98.6 °F) in February 2009.
Precipitation amounts to 19.2 mm (0.8 in), distributed over 2 days.
The day lasts on average 11 hours and 10 minutes.
There are on average 8.5 hours of sunshine per day. So, the sun shines 75% of the time.
The average humidity is 35%.
The average wind speed is 8 kph (5 mph).

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March is generally a warm month. However, there are remarkable differences between night and day. The average temperature is of 22 °C (72 °F), with a minimum of 15.2 °C (59.4 °F) and a maximum of 28.8 °C (83.8 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 9.5 °C (49 °F). However, it dropped to 4.9 °C (40.8 °F) in March 2015.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 34.5 °C (94.5 °F). However, it reached 40 °C (104 °F) in March 1993.
Precipitation amounts to 18.9 mm (0.7 in), distributed over 3 days.
The day lasts on average 12 hours and 0 minutes.
There are on average 8 hours of sunshine per day. So, the sun shines 69% of the time.
The average humidity is 32%. Hence, the air is normally dry.
The average wind speed is 9 kph (6 mph).

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April is generally a very hot month. However, there are remarkable differences between night and day. The average temperature is of 28 °C (82 °F), with a minimum of 20.6 °C (69.1 °F) and a maximum of 35.4 °C (95.7 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 15 °C (58.5 °F). However, it dropped to 9.8 °C (49.6 °F) in April 1992.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 40 °C (103.5 °F). However, it reached 43.2 °C (109.8 °F) in April 2002.
Precipitation amounts to only 5.8 mm (0.2 in), and all occurs in one day.
The day lasts on average 12 hours and 50 minutes.
There are on average 9.5 hours of sunshine per day. So, the sun shines 73% of the time.
The average humidity is 23%. Hence, the air is normally dry.
The average wind speed is 10 kph (6 mph).

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May is generally a scorchingly hot month. However, there are remarkable differences between night and day. The average temperature is of 33.4 °C (92 °F), with a minimum of 25.9 °C (78.6 °F) and a maximum of 41 °C (105.8 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 21 °C (70 °F). However, it dropped to 13.3 °C (55.9 °F) in May 1995.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 44.5 °C (112 °F). However, it reached 47.7 °C (117.9 °F) in May 2017.
Precipitation amounts to only 1.8 mm (0.1 in), distributed over 0 days.
The day lasts on average 13 hours and 30 minutes.
There are on average 10.5 hours of sunshine per day. So, the sun shines 76% of the time.
The average humidity is 17%. Hence, the air is normally dry.
The average wind speed is 11 kph (7 mph).

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June is generally a scorchingly hot month. However, there are remarkable differences between night and day. The average temperature is of 37 °C (99 °F), with a minimum of 29.7 °C (85.5 °F) and a maximum of 44.3 °C (111.7 °F).
On the coldest nights, the temperature usually drops to around 25 °C (77.5 °F). However, it dropped to 21 °C (69.8 °F) in June 2000.
On the warmest days, the temperature usually reaches around 47.5 °C (117 °F). However, it reached 49.3 °C (120.7 °F) in June 2005.
Precipitation amounts to only 4.7 mm (0.2 in), and all occurs in one day.
The day lasts on average 13 hours and 50 minutes. 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 75% of the time.
The average humidity is 17%. Hence, the air is normally dry.
The average wind speed is 12 kph (7 mph).

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July, the hottest month of the year, is generally a scorchingly hot month. However, there are remarkable differences between night and day. The average temperature is of 37.8 °C (100 °F), with a minimum of 31.1 °C (88 °F) and a maximum of 44.4 °C (111.9 °F).
On the coldest nights of the month, the temperature usually drops to around 26.5 °C (80 °F). However, it dropped to 21 °C (69.8 °F) in July 1993.
On the warmest days of the month, the temperature usually reaches around 47 °C (117 °F). However, it reached 48.4 °C (119.1 °F) in July 2006.
Precipitation amounts to only 7.3 mm (0.3 in), and all occurs in one day.
The day lasts on average 13 hours and 40 minutes.
There are on average 9.5 hours of sunshine per day. So, the sun shines 70% of the time.
The average humidity is 21%. Hence, the air is normally dry.
The average wind speed is 12 kph (8 mph).

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August is generally a scorchingly hot month. However, there are remarkable differences between night and day. The average temperature is of 36.2 °C (97 °F), with a minimum of 29.2 °C (84.6 °F) and a maximum of 43.3 °C (109.9 °F).
On the coldest nights of the month, the temperature usually drops to around 24.5 °C (76 °F). However, it dropped to 21 °C (69.8 °F) in August 2000.
On the warmest days of the month, the temperature usually reaches around 46 °C (114.5 °F). However, it reached 47.8 °C (118 °F) in August 2019.
Precipitation amounts to only 5.1 mm (0.2 in), and all occurs in one day.
The day lasts on average 13 hours and 5 minutes.
There are on average 10 hours of sunshine per day. So, the sun shines 75% of the time.
The average humidity is 18%. Hence, the air is normally dry.
The average wind speed is 12 kph (7 mph).

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September is generally a scorchingly hot month. However, there are remarkable differences between night and day. The average temperature is of 33.1 °C (92 °F), with a minimum of 25.6 °C (78.1 °F) and a maximum of 40.6 °C (105.1 °F).
On the coldest nights, the temperature usually drops to around 21.5 °C (70.5 °F). However, it dropped to 17.2 °C (63 °F) in September 1991.
On the warmest days, the temperature usually reaches around 43.5 °C (110.5 °F). However, it reached 46.8 °C (116.2 °F) in September 2001.
Precipitation amounts to only 0.8 mm (0 in), distributed over 0 days.
The day lasts on average 12 hours and 20 minutes.
There are on average 10 hours of sunshine per day. So, the sun shines 83% of the time.
The average humidity is 17%. Hence, the air is normally dry.
The average wind speed is 10 kph (6 mph).

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October is generally a very hot month. However, there are remarkable differences between night and day. The average temperature is of 28 °C (82 °F), with a minimum of 20.4 °C (68.7 °F) and a maximum of 35.5 °C (95.9 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 15 °C (59 °F). However, it dropped to 8 °C (46.4 °F) in October 1992.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 39.5 °C (103.5 °F). However, it reached 41.6 °C (106.9 °F) in October 2013.
Precipitation amounts to only 3.6 mm (0.1 in), distributed over 0 days.
The day lasts on average 11 hours and 30 minutes.
There are on average 10 hours of sunshine per day. So, the sun shines 87% of the time.
The average humidity is 20%. Hence, the air is normally dry.
The average wind speed is 8 kph (5 mph).

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November is generally a warm month. However, there are remarkable differences between night and day. The average temperature is of 21.5 °C (71 °F), with a minimum of 14.3 °C (57.7 °F) and a maximum of 28.7 °C (83.7 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 8 °C (46.5 °F). However, it dropped to 2.5 °C (36.5 °F) in November 2003.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 34 °C (93 °F). However, it reached 38 °C (100.4 °F) in November 1998.
Precipitation amounts to only 2.7 mm (0.1 in), distributed over 0 days.
The day lasts on average 10 hours and 50 minutes.
There are on average 9.5 hours of sunshine per day. So, the sun shines 86% of the time.
The average humidity is 27%. Hence, the air is normally dry.
The average wind speed is 7 kph (5 mph).

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December is generally a very mild month. However, there are remarkable differences between night and day. The average temperature is of 16.6 °C (62 °F), with a minimum of 9.7 °C (49.5 °F) and a maximum of 23.6 °C (74.5 °F).
On the coldest nights of the month, the temperature usually drops to around 3 °C (37.5 °F). However, it dropped to -3.3 °C (26.1 °F) in December 1994.
On the warmest days of the month, the temperature usually reaches around 28.5 °C (83.5 °F). However, it reached 33.2 °C (91.8 °F) in December 2016.
Precipitation amounts to 12.8 mm (0.5 in), and all occurs in one day.
The day lasts on average 10 hours and 30 minutes. December 21, the winter solstice, is the shortest day of the year in the Northern Hemisphere.
There are on average 8.5 hours of sunshine per day. So, the sun shines 80% of the time.
The average humidity is 35%. Hence, the air is normally dry.
The average wind speed is 7 kph (4 mph).