September weather forecast
Mirihana, Sri Lanka

September

Weather in September

September, the first month of the autumn in Mirihana, is still a warm month, with temperature in the range of an average high of 29.1°C (84.4°F) and an average low of 24.9°C (76.8°F).

Temperature

With the onset of September, the average high-temperature registers at a still warm 29.1°C (84.4°F), subtly different from August's 28.9°C (84°F). Throughout September, Mirihana observes a steady low-temperature average of 24.9°C (76.8°F), reflecting a minor dip from daytime highs.

Heat index

For September, the heat index is computed to be a torrid 35°C (95°F). Ensure extra safety steps, heat exhaustion and heat cramps are likely. Long activity might lead to heatstroke.
It is essential to grasp that the heat index's numbers are for shade and light wind settings. Heat index values can rise by 15 Fahrenheit (8 Celsius) degrees when in direct sunlight.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is a fusion of air temperature and moisture levels to demonstrate the sensation of heat. Elements such as metabolic variations, pregnancy, and physical exertion can shape one's weather perception. It is essential to realize that direct sunlight can escalate the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. Young children typically face greater hazards than adults because they do not sweat as much. Their larger skin surface in comparison to their little bodies and the high heat production from their active nature compounds their vulnerability.
Perspiration is the body's default response to elevated temperatures, as it promotes the evaporation of sweat to achieve cooling. When the level of relative humidity is elevated, evaporation diminishes, causing more warmth to be retained in the body than in dry air. Overheating can ensue when the body accumulates more heat than it can release, and dehydration severity may vary.

Humidity

In Mirihana, the average relative humidity in September is 81%.

Rainfall

In September, in Mirihana, the rain falls for 26.9 days. Throughout September, 206mm (8.11") of precipitation is accumulated. Throughout the year, in Mirihana, Sri Lanka, there are 289.4 rainfall days, and 2262mm (89.06") of precipitation is accumulated.

Daylight

The average length of the day in September is 12h and 10min.
On the first day of the month, sunrise is at 06:02 and sunset at 18:17. On the last day of September, sunrise is at 05:58 and sunset at 18:02 +0530.

Sunshine

In September, the average sunshine in Mirihana is 7.4h.

UV index

The months with the highest UV index in Mirihana are January through April, July, September, November and December, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In September, a regular UV index of 7 translates into these guidelines:
Incorporate safeguards and honour sun safety principles. Protection from skin and eye damage is obligatory. Remember that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. Make an effort to avoid direct sun exposure during these hours. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.

Frequently asked questions

How hot is it in Mirihana in September?
In Mirihana, in September, the average high-temperature is 29.1°C (84.4°F), and the average low-temperature is 24.9°C (76.8°F). The average heat index (a.k.a. 'felt air temperature', 'feels like'), which factors the actual air temperature with the relative humidity, in September is computed to be 35°C (95°F).
What is the average humidity in September in Mirihana?
In September, the average relative humidity is 81%.
How much does it rain in Mirihana in September?
In Mirihana, Sri Lanka, during September, the rain falls for 26.9 days and regularly aggregates up to 206mm (8.11") of precipitation.
How many hours of daylight does Mirihana have in September?
In Mirihana, the average day length in September is 12h and 10min.
When are sunrise and sunset in September in Mirihana?
In September, on the first day of the month, sunrise is at 06:02 and sunset at 18:17. On the last day of the month, in Mirihana, sunrise is at 05:58 and sunset at 18:02 +0530.
How long on average sun shines in September in Mirihana?
The average sunshine duration in September in Mirihana, Sri Lanka, is 7.4h.
What is the month with the highest UV index in Mirihana?
The months with the highest UV index in Mirihana, Sri Lanka, are January through April, July, September, November and December, with an average maximum UV index of 7.
What is the UV index intensity in September in Mirihana?
In September, the average daily maximum UV index in Mirihana, Sri Lanka, is 7. A UV Index estimate of 6 to 7 represents a high hazard to health from exposure to Sun's UV rays.
Average high temperature
Average low temperature
Average wind speed
Average max. wind speed
Average wind speed gusts
Average humidity
Average rainfall
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility
Average temperature in September
Mirihana, Sri Lanka
  • Average high temperature in September: 29.1°C

The warmest months (with the highest average high temperature) are March and April (31.8°C).
The months with the lowest average high temperature are July and August (28.9°C).

  • Average low temperature in September: 24.9°C

The month with the highest average low temperature is May (26.3°C).
The coldest month (with the lowest average low temperature) is January (23.1°C).

Average pressure in September
Mirihana, Sri Lanka
  • Average pressure in September: 1009.8mbar

The month with the highest atmospheric pressure is January (1011.6mbar).
The month with the lowest atmospheric pressure is May (1008.6mbar).

Average wind speed in September
Mirihana, Sri Lanka
  • Average wind speed in September: 13.2km/h

The windiest month (with the highest average wind speed) is June (15.1km/h).
The calmest month (with the lowest average wind speed) is March (8km/h).

Average humidity in September
Mirihana, Sri Lanka
  • Average humidity in September: 81%

The months with the highest relative humidity are June, July and August (83%).
The months with the lowest relative humidity are January and February (74%).

Average rainfall in September
Mirihana, Sri Lanka
  • Average rainfall in September: 206mm

The wettest month (with the highest rainfall) is June (341mm).
The driest month (with the least rainfall) is January (40mm).

Average rainfall days in September
Mirihana, Sri Lanka
  • Average rainfall days in September: 26.9 days

The month with the highest number of rainy days is August (30.2 days).
The month with the least rainy days is January (11.6 days).

Average daylight in September /
Average sunshine in September
Mirihana, Sri Lanka
  • Average daylight in September: 12h and 1min

The month with the longest days is June (Average daylight: 12h and 30min).
The month with the shortest days is December (Average daylight: 11h and 42min).

  • Average sunshine in September: 7h and 2min

The month with the most sunshine is January (Average sunshine: 9h and 6min).
The month with the least sunshine is November (Average sunshine: 6h and 42min).

Average sunshine days in September
Mirihana, Sri Lanka
  • Average sunshine days in September: 1.5 days

The month with the most sunshine days is January (17.2 days).
The months with the least sunshine days are June and August (0.3 days).

Average UV index in September
Mirihana, Sri Lanka
  • Average UV index in September: 7

The months with the highest UV index are January, February, March, April, July, September, November and December (UV index 7).
The months with the lowest UV index are May, June, August and October (UV index 6).

Average cloud cover in September
Mirihana, Sri Lanka
  • Average cloud cover in September: 55

The month with the most cloud cover is June (Cloud cover 57).
The month with the least cloud cover is January (Cloud cover 24).

Average visibility in September
Mirihana, Sri Lanka
  • Average visibility in September: 9km

The months with the highest visibility are January, February, March, April and December (10km).
The months with the lowest visibility are May, June, July, August, September, October and November (9km).

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