September weather - Spring 2024

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

Amazing waterfront and the Costa Verde highway line just outside Lima, Peru

Weather in September

September signals the onset of spring in Lima with a fluctuation in temperatures. The days start to lengthen and the city enjoys an average of 12h of daylight. The pressure drops slightly to 1016.1mb, bringing cooler winds from the sea. With sea temperatures rising to 15.8°C (60.4°F), an improvement in beach conditions is seen. Thus, September becomes a transitional month with a mixed bag of weather conditions in Lima.

Temperature

On the advent of September, Lima's average high-temperature exhibits a minor adjustment to a still agreeable 20.5°C (68.9°F) from August's 20°C (68°F). An average nighttime temperature of 15.3°C (59.5°F) is noted in Lima, Peru, during the month of September.

Humidity

August and September, with an average relative humidity of 75%, are the least humid months.

Rainfall

In September, in Lima, the rain falls for 1.3 days. Throughout September, 1mm (0.04") of precipitation is accumulated. In Lima, Peru, during the entire year, the rain falls for 22.6 days and collects up to 18mm (0.71") of precipitation.

Sea temperature

The month with the coldest seawater in Lima is September, with an average sea temperature of 15.8°C (60.4°F).
Note: In water with a temperature of 15.8°C (60.4°F), most people do not enjoy swimming. As the temperature descends from 21°C (69.8°F) to 15°C (59°F), breathing becomes increasingly difficult to control.

Daylight

The average length of the day in September is 12h and 2min.
On the first day of the month, sunrise is at 06:11 and sunset at 18:04. On the last day of September, sunrise is at 05:51 and sunset at 18:04 -05.

Sunshine

The average sunshine in September is 10.5h.

UV index

May through October, with an average maximum UV index of 5, are months with the lowest UV index. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for the average person.
Note: The maximum daily UV index of 5 in September converts into the following recommendations:
Exercise prevention - Warding off sunburn is urged. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.

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Frequently asked questions

What is the usual temperature for Lima in September?

During September, Lima experiences an average high-temperature of 20.5°C (68.9°F) and a low-temperature of 15.3°C (59.5°F).

What are the least humid months in Lima?

The months with the lowest humidity in Lima are August and September, with an average relative humidity of 75%.

What is the average humidity in September in Lima?

The average relative humidity in September in Lima is 75%.

How many days does it rain in September in Lima?

In Lima, Peru, in September, it is raining for 1.3 days, with typically 1mm (0.04") of accumulated precipitation.

What is the month with the coldest sea water in Lima?

September is the month with the coldest seawater in Lima, with an average sea temperature of 15.8°C (60.4°F).

What is the sea temperature in September in Lima?

In Lima, Peru, in September, the average water temperature is 15.8°C (60.4°F). For swimming, a surface water temperature of 15.8°C (60.4°F) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 21°C (69.8°F).

How many hours of daylight does Lima have in September?

The average day length in September is 12h and 2min.

When is the sunrise / sunset in September in Lima?

On the first day of September in Lima, sunrise is at 06:11 and sunset at 18:04. On the last day of the month, sunrise is at 05:51 and sunset at 18:04 -05.

How long on average sun shines in September in Lima?

The average sunshine duration in September in Lima is 10.5h.

When is the lowest UV index in Lima?

May through October, with an average maximum UV index of 5, are months with the lowest UV index.

What is the UV index reading in September in Lima?

In September, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a moderate vulnerability from exposure to Sun's UV rays.

Today

Tomorrow

Long-term

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

Aug

September

Oct

Average high temperature

20°C 68°F

20.5°C 68.9°F

21.3°C 70.3°F

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

13.5km/h 8.4mph

13.4km/h 8.3mph

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

0.3

1.3

0.4

Average sea temperature

Average daylight

Average sunshine

Average sunshine days

28.6

Average UV index

Average cloud cover

13%

15%

Average visibility

10km 6.2mi

Average temperature in September
Lima, Peru

Average high temperature in September: 20.5°C

The warmest month (with the highest average high temperature) is February (25.4°C).
The month with the lowest average high temperature is August (20°C).

Average low temperature in September: 15.3°C

The month with the highest average low temperature is February (21.4°C).
The coldest month (with the lowest average low temperature) is August (14.9°C).

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Average pressure in September
Lima, Peru

Average pressure in September: 1016.1mbar

The month with the highest atmospheric pressure is August (1016.4mbar).
The month with the lowest atmospheric pressure is February (1013.8mbar).

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Average wind speed in September
Lima, Peru

Average wind speed in September: 13.1km/h

The windiest month (with the highest average wind speed) is September (13.1km/h).
The calmest month (with the lowest average wind speed) is February (10.4km/h).

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Average humidity in September
Lima, Peru

Average humidity in September: 75%

The month with the highest relative humidity is December (79%).
The months with the lowest relative humidity are August and September (75%).

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Average rainfall in September
Lima, Peru

Average rainfall in September: 1mm

The wettest month (with the highest rainfall) is February (4mm).
The driest month (with the least rainfall) is May (0mm).

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Average rainfall days in September
Lima, Peru

Average rainfall days in September: 1.3 days

The month with the highest number of rainy days is March (5.7 days).
The month with the least rainy days is November (0.2 days).

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Average sea temperature in September
Lima, Peru

Average sea temperature in September: 15.8°C

The best month for swimming (with the highest average sea temperature) is March (20.9°C).
The coldest month (with the lowest average sea temperature) is September (15.8°C).

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Average daylight in September /
Average sunshine in September
Lima, Peru

Average daylight in September: 12h and 0min

The month with the longest days is December (Average daylight: 12h and 48min).
The month with the shortest days is June (Average daylight: 11h and 24min).

Average sunshine in September: 10h and 3min

The month with the most sunshine is October (Average sunshine: 12h and 0min).
The month with the least sunshine is June (Average sunshine: 7h and 24min).

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Average sunshine days in September
Lima, Peru

Average sunshine days in September: 28.6 days

The months with the most sunshine days are August and October (30 days).
The month with the least sunshine days is February (21.1 days).

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Average UV index in September
Lima, Peru

Average UV index in September: 5

The months with the highest UV index are January, February, March, April, November and December (UV index 6).
The months with the lowest UV index are May, June, July, August, September and October (UV index 5).

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Average cloud cover in September
Lima, Peru

Average cloud cover in September: 13

The month with the most cloud cover is January (Cloud cover 36).
The month with the least cloud cover is August (Cloud cover 9).

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Average visibility in September
Lima, Peru

Average visibility in September: 10km

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

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September weather forecast
Lima, Peru

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