Tehran
Iran
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Tehran, Iran

A golden illusion of the front view of the Zaid Mosque in Tehran, Iran, under gray skies
A golden illusion of the front view of the Zaid Mosque in Tehran, Iran, under gray skies
September, the first month of the autumn, in Tehran, is still a hot month, with average temperature ranging between min 21.3°C (70.3°F) and max 31.6°C (88.9°F).

Temperature

In September, the average high-temperature slightly decreases, from a very hot 35.9°C (96.6°F) in August, to a hot 31.6°C (88.9°F). In September, in Tehran, the average low-temperature is 21.3°C (70.3°F).

Humidity

In September, the average relative humidity in Tehran, Iran, is 27%.

Rainfall

The month with the least rainfall is September when the rain falls for 1 days and typically collects 1.1mm (0") of precipitation.

Snowfall

In Tehran, during the entire year, snow falls for 12.3 days.

Daylight

The average length of the day in September is 12.4h.

Sunshine

In September, the average sunshine is 10.1h.

UV index

The average daily maximum UV index in Tehran, Iran, is 9. A UV Index estimate of 8 to 10 represents a very high health risk from the exposure to the Sun's UV radiation for the average person.
Note: In September, the average maximum UV index of 9 translate into the following recommendations:
Take special precautions, as unprotected skin can be damaged and can burn quickly. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim.

What is the temperature in September in Tehran?

The average high-temperature, in September, in Tehran, is 31.6°C (88.9°F), while the average low-temperature is 21.3°C (70.3°F).

What is the average humidity in September in Tehran?

In September, the average relative humidity is 27%.

How much does it rain in Tehran in September?

In Tehran, during September, the rain falls for 1 days and regularly aggregates up to 1.1mm (0") of precipitation.

What is the driest month in Tehran?

September is the month with the least rainfall in Tehran, Iran. Rain falls for 1 days and accumulates 1.1mm (0") of precipitation.

How many hours of daylight does Tehran have in September?

In September, the average length of the day in Tehran is 12.4h.

How many hours of sunshine does Tehran have in September?

In September, the average sunshine is 10.1h.

How high is the UV index in September in Tehran?

In September, the average daily maximum UV index in Tehran, Iran, is 9. A UV Index reading of 8 to 10 represents a very high health threat from the exposure to the Sun's UV radiation.
Average temperature in September - Tehran, Iran
  • Average high temperature in September: 31.6°C

The warmest month (with the highest average high temperature) is July (36.8°C).
The month with the lowest average high temperature is January (8.3°C).

  • Average low temperature in September: 21.3°C

The month with the highest average low temperature is July (25.7°C).
The coldest month (with the lowest average low temperature) is January (1.2°C).

Average humidity in September - Tehran, Iran
  • Average humidity in September: 27%

The month with the highest relative humidity is January (64%).
The month with the lowest relative humidity is June (25%).

Average rainfall in September - Tehran, Iran
  • Average rainfall in September: 1.1mm

The wettest month (with the highest rainfall) is March (40.8mm).
The driest month (with the lowest rainfall) is September (1.1mm).

Average rainfall days in September - Tehran, Iran
  • Average rainfall days in September: 1 days

The month with the highest number of rainy days is March (10.9 days).
The month with the lowest number of rainy days is September (1 days).

Average snowfall days in September - Tehran, Iran
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (5.1 days).
Months with the lowest number of snowfall days are May, June, July, August, September and October (0 days).

Average daylight in September / Average sunshine in September - Tehran, Iran
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.5h).
The month with shortest days is December (Average daylight: 9.8h).

  • Average sunshine in September: 10.1h

Months with most sunshine are June and August (Average sunshine: 11h).
The month with least sunshine is December (Average sunshine: 4.9h).

Average UV index in September - Tehran, Iran
  • Average UV index in September: 9

Months with the highest UV index are June and July (UV index 12).
The month with the lowest UV index is December (UV index 2).