How extreme does Tehran's weather get?

The hottest, coldest, wettest and snowiest days Tehran has recorded — the outer limits of what its weather can do, and how far they sit beyond a normal day.

Based on 50+ years of daily weather observations (1973–present), from the Tehran-Mehrabad station 10 km away. Updated through August 2025 — an all-time extreme only changes when a more extreme day actually occurs, so some dates are old. That is normal, not stale data.

The four kinds of extreme

The hottest, coldest, wettest and snowiest single days Tehran has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day

109°F Jul 6, 1975

That is about 10°F hotter than a normal July afternoon in Tehran (typical high near 99°F).

The three most extreme on record

1 109°F Jul 6, 1975

2 109°F Jul 16, 2008

3 109°F Jul 25, 2013

❄️ Coldest night

9°F Jan 1, 1973

About 21°F colder than a normal January night in Tehran (typical low near 30°F).

The three most extreme on record

1 9°F Jan 1, 1973

2 9°F Jan 2, 1973

3 11°F Dec 12, 2003

🌧️ Most rain in one day

4.92 in May 8, 1990

More rain in a single day than Tehran usually gets in the whole month of May (typical May total about 0.5 in).

The three most extreme on record

1 4.92 in May 8, 1990

2 4.13 in Mar 16, 1992

3 3.98 in Feb 12, 2013

How hot and cold it gets, month by month

The shaded band is the normal range of daily temperatures for each month. The dots show the most extreme it has ever been — so you can see how far beyond a normal day the records really sit.

normal range of daily temperatureshottest ever recordedcoldest ever recorded

Tehran's record heat sits well above even a hot day for the season — July's 109°F is about 10°F beyond a normal hot afternoon. Its record cold is just as far below a normal winter night — the dots mark how rare each extreme really is.

In plain terms

In a normal year, Tehran's warmest days reach the high 90s°F and its coldest nights drop to the low 30s°F. But across the record it has gone as high as 109°F and as low as 9°F. A single day has delivered over 5 inches of rain. Those are the outer edges worth knowing if you are moving here, planning a trip, or thinking about a house.

Methodology & sources

Temperature — modelled for this location from ERA5-Land reanalysis, a ~9 km global grid, because no long-record weather station is close enough to use.

Precipitation — 1991–2020 normals computed from 26 years of daily observations at Tehran-mehrabad, a weather station, about 10 km from the city centre. The underlying daily records come from NOAA's global station network.

How we build these numbers →

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