The honest answer to when you should fly Tehran to Tokyo is mostly about weather and demand at the far end. On three years of daily observations at the arrival airport, May-Jun, Oct-Nov gives the most comfortable combination of temperature and rainfall in Tokyo.
Averages below come from three full years of daily readings at Tokyo’s main airport, not from a seasonal generalisation. The warmest month is August (average high 32°C), the coolest is January (average low 1°C), and the wettest is June (262 mm).
| Month | Avg high | Avg low | Rainfall | Wet days | Tehran high |
|---|---|---|---|---|---|
| January | 10°C | 1°C | 39 mm | 5 | 11°C |
| February | 11°C | 2°C | 61 mm | 7 | 13°C |
| March | 14°C | 5°C | 151 mm | 14 | 17°C |
| April | 20°C | 11°C | 138 mm | 15 | 25°C |
| May good | 23°C | 15°C | 168 mm | 14 | 31°C |
| June good | 26°C | 19°C | 262 mm | 14 | 36°C |
| July | 31°C | 23°C | 120 mm | 13 | 39°C |
| August | 32°C | 24°C | 166 mm | 15 | 38°C |
| September | 30°C | 23°C | 187 mm | 14 | 33°C |
| October good | 23°C | 16°C | 149 mm | 13 | 26°C |
| November good | 18°C | 9°C | 74 mm | 8 | 19°C |
| December | 13°C | 3°C | 42 mm | 5 | 12°C |
Climate data: Open-Meteo reanalysis archive.
Tokyo runs 5.5 hours ahead of Tehran. Travelling east is the harder direction to adjust to, so if the trip is short, an early departure that lands in daylight is worth more than a marginally cheaper overnight.
We publish observed fares for this route when we have them, and say nothing when we do not — there is no estimate on this page. What holds regardless of the route:
Midweek departures are consistently cheaper than Friday and Sunday on most routes, because that is where demand sits rather than because of any pricing trick. Where we have observed fares for Tehran–Tokyo, the weekday breakdown appears further down this page; where we do not, we leave it out rather than estimate it.
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