September weather forecast
Yerevan, Armenia

September brings a welcome reprieve from the sweltering heat of August in Yerevan. The gradual decrease in temperature and shorter daylight hours indicate the onset of autumn. Fewer sunlight hours do not deter outdoor activities, as cooler days make for pleasant exploration of Yerevan's alleys and attractions. The mild weather and lingering summer vibes make September an appealing month for travel and leisure in this historic city.

Temperature

The onset of September brings a small shift in high-temperatures, falling from a tropical 33.4°C (92.1°F) in August to a warm 28.7°C (83.7°F). Despite a significant deviation from daily highs, September sees an average nighttime temperature of 13.4°C (56.1°F).

Heat index

The heat index value for September is appraised at 29°C (84.2°F). Extended exposure and activity might lead to tiredness, potentially resulting in heat cramps.
It is worth noting that heat index values are gauged for conditions in the shade and light breezes. The heat index can potentially augment by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is an estimation of the warmth sensation when considering humidity levels. Factors such as metabolic variations, being pregnant, and physical activity can impact an individual's weather perception. Consider the sun's direct rays and their impact; they can potentially increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Young children are more at risk than adults since they tend to sweat less. Moreover, their large skin surface in proportion to their small bodies and the high heat production due to their activities contribute to their vulnerability.

Humidity

In Yerevan, the average relative humidity in September is 51%.

Rainfall

September is the month with the least rainfall in Yerevan. Rain falls for 4 days and accumulates 8mm (0.31") of precipitation.

Snowfall

In Yerevan, snow does not fall in May through September.

Daylight

The average length of the day in September in Yerevan is 12h and 28min.
On the first day of September in Yerevan, sunrise is at 06:29 and sunset at 19:33. On the last day of the month, sunrise is at 06:57 and sunset at 18:45 +04.

Sunshine

In September, the average sunshine is 9.3h.

UV index

In September, the average daily maximum UV index in Yerevan is 7. A UV Index estimate of 6 to 7 represents a high health risk from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The maximum daily UV index of 7 during September translates into the following directions:
Embrace precautions and observe sun safety norms. Evasion of sunburn is a necessity. It's important to stay in the shade and limit exposure to the sun from 10 a.m. to 4 p.m., when UV radiation is most intense, although remember that shade structures may not provide full sun protection. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses.