Climate averages 1991–2020
Tehran weather
in January.
A cold, moderately wet month: the coolest and the 7th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
January is a cold month in Tehran: daytime highs average 5.3°C and nights cool to about -5.3°C. By daytime temperature it is the coolest month of the year.
Expect about 42 mm of rain on roughly 8 days, which makes January a moderately wet month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 10 h 02 min on an average January day.
The nearest other city in this atlas is Tajrīsh (12 km away). In January its highs average 2.2°C, 3.2°C cooler than Tehran, with 42 mm of rain.
Among the 128 cities listed in Iran, Tehran ranks joint 84th of 128 for the warmest January highs and joint 66th of 128 for the driest January (rainfall, lowest first). The mean January high of those 128 cities is 8.6°C; Tehran is 3.3°C cooler than that mean.
From January to February, average highs rise by 2.1°C to 7.4°C, and monthly rainfall rises from 42 mm to 49 mm.
The annual picture
January in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Tehran climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January, selected | 5.3°C-5.3°C | -5.3°C | 42 | 7.6 | 10.010 h |
| February | 7.4°C-3.5°C | -3.5°C | 49 | 8.5 | 10.911 h |
| March | 13.3°C1.6°C | 1.6°C | 62 | 9.5 | 11.912 h |
| April | 20.0°C8.0°C | 8.0°C | 51 | 9.5 | 13.113 h |
| May | 26.6°C14.0°C | 14.0°C | 22 | 5.0 | 14.014 h |
| June | 32.9°C20.4°C | 20.4°C | 5.8 | 1.6 | 14.515 h |
| July | 35.6°C24.5°C | 24.5°C | 4.6 | 1.2 | 14.314 h |
| August | 34.6°C23.4°C | 23.4°C | 4.2 | 0.8 | 13.514 h |
| September | 29.9°C18.6°C | 18.6°C | 4.7 | 0.9 | 12.412 h |
| October | 22.6°C12.0°C | 12.0°C | 21 | 4.1 | 11.311 h |
| November | 13.4°C3.8°C | 3.8°C | 45 | 7.1 | 10.310 h |
| December | 7.6°C-2.2°C | -2.2°C | 43 | 7.5 | 9.810 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
January in nearby cities
- Tajrīsh in JanuaryIran · 12 kmHigh 2.2°C · Low -7.9°C · 42 mm rain
- Eslamshahr in JanuaryIran · 23 kmHigh 7.4°C · Low -3.6°C · 42 mm rain
- Bāghestān in JanuaryIran · 27 kmHigh 7.2°C · Low -4.1°C · 42 mm rain
- Golestān in JanuaryIran · 29 kmHigh 8.1°C · Low -3.0°C · 42 mm rain
- Qarchak in JanuaryIran · 33 kmHigh 8.6°C · Low -2.3°C · 38 mm rain
- Shahrīār in JanuaryIran · 33 kmHigh 6.2°C · Low -5.0°C · 37 mm rain
- Pākdasht in JanuaryIran · 34 kmHigh 8.2°C · Low -1.9°C · 30 mm rain
- Pardīs in JanuaryIran · 36 kmHigh 0.8°C · Low -7.6°C · 36 mm precipitation
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Tehran) is explained once on the Tehran year overview and on the Sources, method and limits page.
Tajrīsh lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.