September weather - Spring 2023

Weather in September
Frequently asked questions
Average temperature in September
Average pressure in September
Average wind speed in September
Average humidity in September
Average rainfall in September
Average rainfall days in September
Average sea temperature in September
Average daylight in September
Average sunshine in September
Average sunshine days in September
Average UV index in September
Average cloud cover in September
Average visibility in September

A view from mount Copolia, of the scenic islands of Victoria and Eden, in Mahé, Seychelles, surrounded by clear water

Weather in September

September in Mahé, Seychelles, brings a slight increase in temperature and rainfall. There occurs a substantial jump in the amount of rain, reaching 79mm over an average of 20.5 days. However, the humidity and pressure remain mostly unchanged from August. Despite these changes, the month is still primarily characterized by pleasant weather suitable for sightseeing and water activities. The increase in rainfall completely refreshes and invigorates the island's vibrant natural beauty.

Temperature

The shift into September in Mahé reveals an average high-temperature of a still warm 26.8°C, closely mirroring August's climate. Night temperatures during September in Mahé experience a slight downturn, averaging a still warm 26.1°C.

Humidity

The months with the highest humidity are July through September, with an average relative humidity of 80%.

Rainfall

In Mahé, in September, it is raining for 20.5 days, with typically 79mm of accumulated precipitation. In Mahé, during the entire year, the rain falls for 241.9 days and collects up to 1432mm of precipitation.

Sea temperature

In Mahé, the average seawater temperature in September is 27.4°C.
Note: Water surface temperatures from 25°C to 29°C are considered optimal and extremely delightful for long-lasting pleasure in any water activity.

Daylight

In September, the average length of the day is 12h and 5min.
On the first day of September in Mahé, Seychelles, sunrise is at 06:17 and sunset at 18:18. On the last day of the month, sunrise is at 06:03 and sunset at 18:12 +04.

Sunshine

September has the least sunshine of the year in Mahé, with an average of 7h of sunshine.

UV index

January through December, with an average maximum UV index of 7, are months with the highest UV index. January through December, with an average maximum UV index of 7, are months with the lowest UV index. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: A maximum high daily UV index of 7 during September translates into the following directions:
Avoid overexposure. Fair-skinned individuals can burn in under 20 minutes. Avoid direct Sun exposure and stay in the shade between 10 a.m. and 4 p.m., a time when UV radiation is most intense, noting that not all shade structures offer full protection. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Take note! Sand and water reflections strengthen the Sun's UV exposure.

[Resources]

FAQ

What are September temperatures in Mahé?

During September, Mahé experiences an average high-temperature of 26.8°C and a low-temperature of 26.1°C. In June, the average heat index (a.k.a. 'feels like', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, is estimated at 31°C.

What is the most humid month in Mahé?

July through September, with an average relative humidity of 80%, are most humid months in Mahé.

What is the average humidity in September in Mahé?

In Mahé, the average relative humidity in September is 80%.

How many days does it rain in September in Mahé?

In Mahé, during September, the rain falls for 20.5 days and regularly aggregates up to 79mm of precipitation.

What is the water temperature in September in Mahé?

In September, the average sea temperature is 27.4°C. For swimming, diving, and other water activities, temperatures between 25°C and 29°C are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

How many hours of daylight does Mahé have in September?

In Mahé, the average day length in September is 12h and 5min.

When is the sunrise / sunset in September in Mahé?

On the first day of September in Mahé, sunrise is at 06:17 and sunset at 18:18. On the last day of the month, sunrise is at 06:03 and sunset at 18:12 +04.

What is the month with the least sunshine in Mahé?

The month with the least sunshine is September, with an average of 7h of sunshine.

How long on average sun shines in September in Mahé?

In Mahé, Seychelles, the average sunshine duration in September is 7h.

When is the highest UV index in Mahé?

January through December, with an average maximum UV index of 7, are months with the highest UV index in Mahé.

What is the month with the lowest UV index in Mahé?

January through December, with an average maximum UV index of 7, are months with the lowest UV index.

How high is the UV index in September in Mahé?

The average daily maximum UV index in September is 7. A UV Index reading of 6 to 7 represents a high hazard to health from unprotected exposure to UV radiation.

Today

Tomorrow

Long-term

Year J F M A M J J A September O N D

Aug

September

Oct

Average high temperature

26.4°C

26.8°C

27.5°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

28.9km/h

26.6km/h

19.5km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

17.8

20.5

18.1

Average sea temperature

Average daylight

Average sunshine

Average sunshine days

5.1

3.8

8.7

Average UV index

Average cloud cover

Average visibility

Average temperature in September
Mahé, Seychelles

Average high temperature in September: 26.8°C

The warmest month (with the highest average high temperature) is April (29.3°C).
The month with the lowest average high temperature is August (26.4°C).

Average low temperature in September: 26.1°C

The month with the highest average low temperature is April (28.1°C).
The coldest months (with the lowest average low temperature) are July and August (25.7°C).

[Resources]

Average pressure in September
Mahé, Seychelles

Average pressure in September: 1012.3mbar

The month with the highest atmospheric pressure is August (1012.4mbar).
The month with the lowest atmospheric pressure is April (1010.4mbar).

[Resources]

Average wind speed in September
Mahé, Seychelles

Average wind speed in September: 26.2km/h

The windiest month (with the highest average wind speed) is August (28.1km/h).
The calmest month (with the lowest average wind speed) is April (12.8km/h).

[Resources]

Average humidity in September
Mahé, Seychelles

Average humidity in September: 80%

The months with the highest relative humidity are July, August and September (80%).
The month with the lowest relative humidity is April (73%).

[Resources]

Average rainfall in September
Mahé, Seychelles

Average rainfall in September: 79mm

The wettest month (with the highest rainfall) is January (220mm).
The driest month (with the least rainfall) is August (50mm).

[Resources]

Average rainfall days in September
Mahé, Seychelles

Average rainfall days in September: 20.5 days

The month with the highest number of rainy days is January (23.2 days).
The month with the least rainy days is November (17.3 days).

[Resources]

Average sea temperature in September
Mahé, Seychelles

Average sea temperature in September: 27.4°C

The best month for swimming (with the highest average sea temperature) is April (29.8°C).
The coldest month (with the lowest average sea temperature) is August (26.2°C).

[Resources]

Average daylight in September /
Average sunshine in September
Mahé, Seychelles

Average daylight in September: 12h and 1min

The month with the longest days is December (Average daylight: 12h and 24min).
The month with the shortest days is June (Average daylight: 11h and 54min).

Average sunshine in September: 7h and 0min

The month with the most sunshine is November (Average sunshine: 10h and 6min).
The month with the least sunshine is September (Average sunshine: 7h and 0min).

[Resources]

Average sunshine days in September
Mahé, Seychelles

Average sunshine days in September: 3.8 days

The month with the most sunshine days is November (10.9 days).
The month with the least sunshine days is June (3 days).

[Resources]

Average UV index in September
Mahé, Seychelles

Average UV index in September: 7

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

[Resources]

Average cloud cover in September
Mahé, Seychelles

Average cloud cover in September: 51

The month with the most cloud cover is September (Cloud cover 51).
The month with the least cloud cover is November (Cloud cover 41).

[Resources]

Average visibility in September
Mahé, Seychelles

Average visibility in September: 10km

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

[Resources]

September weather forecast
Mahé, Seychelles

Contents