September weather forecast
Nagu, Finland

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Weather in September

The first month of the autumn, September, is still a refreshing month in Nagu, Finland, with an average temperature ranging between max 15.3°C (59.5°F) and min 10.2°C (50.4°F).

Temperature

As September commences, the average high-temperature subtly reduces, transitioning from a comfortable 19.7°C (67.5°F) in August to a moderate 15.3°C (59.5°F). Nagu records an average low-temperature of 10.2°C (50.4°F) throughout the month of September.

Humidity

In Nagu, the average relative humidity in September is 79%.

Rainfall

In September, the rain falls for 13.6 days. Throughout September, 36mm (1.42") of precipitation is accumulated. In Nagu, during the entire year, the rain falls for 133.7 days and collects up to 390mm (15.35") of precipitation.

Snowfall

In Nagu, snow does not fall in June through September.

Sea temperature

In Nagu, Finland, in September, the average water temperature is 9.8°C (49.6°F).
Note: Caution: 9.8°C (49.6°F) temperatures below 10°C (50°F) during swimming can result in intense cold shock and quickened breathing.

Daylight

In Nagu, the average length of the day in September is 12h and 52min.
On the first day of the month, sunrise is at 06:28 and sunset at 20:36. On the last day of September, in Nagu, sunrise is at 07:36 and sunset at 19:07 EEST.

Sunshine

The average sunshine in September in Nagu is 7.7h.

UV index

In September, the average daily maximum UV index is 3. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the ordinary person.
Note: The maximum UV index of 3 during September leads to these instructions:
Adopt protective measures - Requirement to safeguard skin and eyes from harm exists. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear.
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Frequently asked questions

What are the temperatures in Nagu in September?

During September, Nagu experiences an average high-temperature of 15.3°C (59.5°F) and a low-temperature of 10.2°C (50.4°F).

What is the average humidity in September in Nagu?

In September, the average relative humidity is 79%.

How much does it rain in Nagu in September?

In Nagu, Finland, in September, it is raining for 13.6 days, with typically 36mm (1.42") of accumulated precipitation.

When it does not snow in Nagu?

In Nagu, snow does not fall in June through September.

Does it snow in Nagu in September?

In Nagu, in September, it doesn't snow. In October, it regularly snows.

What is the water temperature in September in Nagu?

In Nagu, the average seawater temperature in September is 9.8°C (49.6°F). At temperatures below 10°C (50°F), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 13°C (55.4°F) is not comfortable.

What is the average length of the day in September in Nagu?

In September, the average day length in Nagu, Finland, is 12h and 52min.

What time are sunrise and sunset in September in Nagu?

On the first day of September in Nagu, sunrise is at 06:28 and sunset at 20:36. On the last day of the month, sunrise is at 07:36 and sunset at 19:07 EEST.

How long on average sun shines in September in Nagu?

The average sunshine duration in September in Nagu, Finland, is 7.7h.

How high is the UV index in September in Nagu?

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

Average temperature in September
Nagu, Finland

Average temperature in September - Nagu, Finland
  • Average high temperature in September: 15.3°C

The warmest month (with the highest average high temperature) is July (20.4°C).
The month with the lowest average high temperature is January (-1.9°C).

  • Average low temperature in September: 10.2°C

The months with the highest average low temperature are July and August (13.8°C).
The coldest month (with the lowest average low temperature) is February (-5.6°C).

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Average pressure in September
Nagu, Finland

Average pressure in September - Nagu, Finland
  • Average pressure in September: 1013.2mbar

The month with the highest atmospheric pressure is May (1014.9mbar).
The month with the lowest atmospheric pressure is December (1007.6mbar).

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Average wind speed in September
Nagu, Finland

Average wind speed in September - Nagu, Finland
  • Average wind speed in September: 15.8km/h

The windiest month (with the highest average wind speed) is December (20.4km/h).
The calmest month (with the lowest average wind speed) is July (13.9km/h).

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Average humidity in September
Nagu, Finland

Average humidity in September - Nagu, Finland
  • Average humidity in September: 79%

The month with the highest relative humidity is February (91%).
The month with the lowest relative humidity is May (71%).

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Average rainfall in September
Nagu, Finland

Average rainfall in September - Nagu, Finland
  • Average rainfall in September: 36mm

The wettest month (with the highest rainfall) is July (49mm).
The driest month (with the least rainfall) is April (19mm).

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Average rainfall days in September
Nagu, Finland

Average rainfall days in September - Nagu, Finland
  • Average rainfall days in September: 13.6 days

The month with the highest number of rainy days is July (15.1 days).
The month with the least rainy days is February (5.2 days).

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Average snowfall in September
Nagu, Finland

Average snowfall in September - Nagu, Finland
  • Average snowfall in September: 0mm

The month with the highest snowfall is January (103mm).
The months with the least snowfall are June, July, August and September (0mm).

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Average snowfall days in September
Nagu, Finland

Average snowfall days in September - Nagu, Finland
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (13.7 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average sea temperature in September
Nagu, Finland

Average sea temperature in September - Nagu, Finland
  • Average sea temperature in September: 9.8°C

The best month for swimming (with the highest average sea temperature) is August (12.4°C).
The coldest months (with the lowest average sea temperature) are February and March (-0.2°C).

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Average daylight in September /
Average sunshine in September
Nagu, Finland

Average daylight in September / Average sunshine in September - Nagu, Finland
  • Average daylight in September: 12h and 5min

The month with the longest days is June (Average daylight: 18h and 48min).
The month with the shortest days is December (Average daylight: 6h and 0min).

  • Average sunshine in September: 7h and 4min

The month with the most sunshine is July (Average sunshine: 11h and 30min).
The month with the least sunshine is December (Average sunshine: 2h and 0min).

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Average sunshine days in September
Nagu, Finland

Average sunshine days in September - Nagu, Finland
  • Average sunshine days in September: 13.2 days

The month with the most sunshine days is May (17.2 days).
The month with the least sunshine days is December (9.6 days).

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Average UV index in September
Nagu, Finland

Average UV index in September - Nagu, Finland
  • Average UV index in September: 3

The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 1).

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Average cloud cover in September
Nagu, Finland

Average cloud cover in September - Nagu, Finland
  • Average cloud cover in September: 44

The month with the most cloud cover is December (Cloud cover 71).
The months with the least cloud cover are July and August (Cloud cover 36).

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Average visibility in September
Nagu, Finland

Average visibility in September - Nagu, Finland
  • Average visibility in September: 10km

The months with the highest visibility are May, June, July, August and September (10km).
The months with the lowest visibility are February and March (8km).

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Nagu, Finland

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