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Solar data for Iran

Across the 423 places in Iran the best fixed tilt for solar panels runs from 24° in Kīsh to 33° in Khūy, and flat ground gets 3.9 to 6.1 peak sun hours a day. Every number is computed for each place.

Solar power in Iran at a glance

Averages over 423 places with climate data, for a fixed array facing south.

Best panel angle29°average, facing south
Peak sun hours5.31a day on flat ground
1 kWp makes1,760kWh a year at the best angle
Off-grid angle53°average, for the darkest month
TehranJālq (most sun)
  • 3.92–4.36
  • 4.36–4.79
  • 4.79–5.23
  • 5.23–5.66
  • 5.66–6.10

Peak sun hours a day on flat ground. Each dot is one place.

The sunniest place in Iran is Jālq (Sistan and Baluchestan) with 6.10 peak sun hours a day on flat ground; the least sunny is Bandar-e Anzalī with 3.92. A 1 kWp array at its best angle makes from 1,293 kWh a year in Bandar-e Anzalī to 1,984 kWh in Shahr-e Bābak — 1,760 kWh on average.

The best year-round tilt runs from 24° in Kīsh to 33° in Khūy. Off-grid systems are sized for the darkest month and do better steeper, at 53° on average: at 70° that month brings 2.29 kWh per kWp a day in Jask and 3.36 kWh in Marāgheh.

Size an off-grid system or open any place below for its sun path, monthly table and tilt curve.

Sunniest places in Iran

Ranked by peak sun hours on flat ground: the yearly average of a day's sunshine energy (NASA POWER climatology). Output: 1 kWp at its best year-round angle.

RankPlaceRegionSun hours/daykWh per kWp a yearBest tilt
1JālqSistan and Baluchestan6.101,96127°
2SarāvānSistan and Baluchestan6.071,95327°
3IranshahrSistan and Baluchestan6.041,91427°
4NeyrīzFars6.031,97728°
5EstahbānFars6.011,96328°
5KhāshSistan and Baluchestan6.011,94427°
7DārābFars6.001,94627°
8Shahr-e BābakKerman5.991,98428°
8LārFars5.991,89626°
10FasāFars5.981,94227°

Least sunny places in Iran

RankPlaceRegionSun hours/daykWh per kWp a yearBest tilt
419ĀmolMāzandarān4.121,38430°
419Āstāneh-ye AshrafīyehGilan Province4.121,36329°
421RashtGilan Province4.091,35630°
422KhomāmGilan Province3.991,31729°
423Bandar-e AnzalīGilan Province3.921,29329°

Solar by region in Iran

Averages of the places in each region, sunniest first. Darkest month: what 1 kWp of off-grid panels at 70° makes a day in the worst month of the year.

RegionPlacesSun hours/daykWh per kWp a yearBest tiltDarkest month at 70°Sunniest place
Sistan and Baluchestan115.961,89427°2.45 kWhJālq
Fars315.931,92427°2.67 kWhNeyrīz
Kerman175.901,93028°2.66 kWhShahr-e Bābak
Yazd Province95.831,93730°2.89 kWhBāfq
Hormozgan115.821,81625°2.43 kWhḨājjīābād
Bushehr145.761,80726°2.58 kWhNakhl-e Taqī
Kohgiluyeh and Boyer-Ahmad55.751,84927°2.76 kWhDogonbadan
South Khorasan Province55.731,91830°2.98 kWhNehbandān
Isfahan365.691,91430°2.98 kWhShahreẕā
Chaharmahal and Bakhtiari65.661,87928°2.94 kWhBorūjen
Khuzestan315.591,77228°2.78 kWhBehbahān
Ilam Province55.471,78929°2.98 kWhDehlorān
Lorestan Province105.421,80329°3.06 kWhPoldokhtar
Hamadan Province75.371,81930°3.17 kWhNahāvand
Kermanshah Province115.361,79229°3.14 kWhSonqor
Qom Province25.341,79730°3.11 kWhShahrak-e Pardīsān
Markazi115.341,80130°3.12 kWhKhomeyn
Razavi Khorasan185.301,79831°3.19 kWhGonābād
Kurdistan Province85.281,78430°3.23 kWhQorveh
Semnan65.121,73831°3.15 kWhGarmsār
Tehran485.101,72031°3.15 kWhḨasanābād
Zanjan45.081,73631°3.23 kWhQīdar
North Khorasan55.051,72431°3.28 kWhJājarm
West Azerbaijan174.971,69831°3.30 kWhTakāb
Alborz Province104.951,67130°3.14 kWhEshtehārd
East Azerbaijan194.941,69832°3.34 kWhMalekān
Qazvin Province104.871,64930°3.16 kWhShāl
Golestan144.751,60832°3.11 kWh'Alī Ābād-e Katūl
Ardabil Province54.371,48631°3.04 kWhMeshgīn Shahr
Māzandarān204.261,43130°2.82 kWhGalūgāh
Gilan Province174.211,40330°2.77 kWhManjīl

Largest places in Iran at a glance

PlaceLatitudeBest tiltOff-grid tiltSun hours/day (flat)
Tehran35.7° N30°61°5.00
Mashhad36.3° N31°61°5.19
Isfahan32.7° N30°46°5.74
Karaj35.8° N30°61°4.93
Tabriz38.1° N32°65°4.89
Shiraz29.6° N27°41°5.93
Qom34.6° N30°56°5.34
Ahvaz31.3° N28°51°5.59
Kermanshah34.3° N29°57°5.38
Rasht37.3° N30°61°4.09
Kerman30.3° N28°39°5.89
Orūmīyeh37.6° N31°64°5.01
Zahedan29.5° N28°36°5.97
Hamadān34.8° N30°57°5.37
Arāk34.1° N30°55°5.40
Yazd31.9° N30°43°5.83
Eslamshahr35.6° N31°60°5.16
Ardabīl38.2° N31°62°4.37
Zanjan36.7° N31°64°5.05
Bandar Abbas27.2° N25°35°5.81

Daylight and clock time in Iran

In Pārsābād (39.6° N), the northernmost place, the longest day of the year lasts 14 h 59 min and the shortest 9 h 22 min; in Chabahar (25.3° N), the southernmost, 13 h 43 min and 10 h 34 min. Iran does not use daylight saving time: the clocks stay the same all year.

Time zonePlacesUTC offsetClocks change in 2026
Asia/Tehran423UTC+3:30no daylight saving time

Questions about solar in Iran

What is the best angle for solar panels in Iran?
Facing south, between 24° and 33° depending on the place — 29° on average over 423 places. Off-grid systems that must get through the darkest month do better steeper, at about 53° on average.
How many peak sun hours does Iran get?
From 3.9 hours a day in Bandar-e Anzalī to 6.1 in Jālq on flat ground, averaged over the year; 5.3 on average.
How much electricity does 1 kWp of solar panels produce in Iran?
About 1,760 kWh a year at the best fixed angle on average, from 1,293 kWh in Bandar-e Anzalī to 1,984 kWh in Shahr-e Bābak. These are long-term climate averages; a single year can be several per cent higher or lower.
Where is the sunniest place in Iran?
Jālq (Sistan and Baluchestan) gets the most sun of the 423 places: 6.10 peak sun hours a day on flat ground, so 1 kWp there makes about 1,961 kWh a year.
Does Iran use daylight saving time?
Iran does not use daylight saving time: the clocks stay the same all year.
How long is the longest day in Iran?
14 h 59 min in Pārsābād; the shortest day lasts 9 h 22 min in Pārsābād.

All places in Iran

Kohgiluyeh and Boyer-Ahmad