September weather forecastPiriápolis, Uruguay
September
Weather in September
In September, Piriápolis experiences a noticeable change, with the onset of spring slowly heating up the city. The sea too, follows suit, gradually regaining its lost summer warmth. Winds maintain their speed, harmonizing perfectly with the transitional climate. Cloud cover persists, intermittently veiling the sun's rays. Interestingly, the atmospheric pressure drops to an average of 1017.9 millibars, signaling the upcoming change in weather.Temperature
September ushers in an average high-temperature of a still refreshing 15.5°C (59.9°F), aligning closely with the preceding month. Piriápolis's nighttime temperature in September consistently rests at a cool 11.4°C (52.5°F).Humidity
July through September, with an average relative humidity of 79%, are the most humid months.Rainfall
In Piriápolis, in September, it is raining for 10.2 days, with typically 56mm (2.2") of accumulated precipitation. In Piriápolis, during the entire year, the rain falls for 136.9 days and collects up to 714mm (28.11") of precipitation.Sea temperature
In September, the average sea temperature is 12.7°C (54.9°F).Note: Swimming in 12.7°C (54.9°F) is considered life-threatening. Even a few minutes in 13°C (55.4°F) water is uncomfortable, and swimming below 10°C (50°F) may cause total loss of breathing control and cold shock, depending on a person's physique.
Daylight
In September, the average length of the day is 11h and 53min.On the first day of September, sunrise is at 06:58 and sunset at 18:22. On the last day of the month, sunrise is at 06:17 and sunset at 18:43 -03.
Sunshine
The average sunshine in September is 7.4h.UV index
The average daily maximum UV index in September in Piriápolis is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: In September, a daily maximum UV index of 4 leads to the following instructions:
Ensure safety - Recommendations to avert sunburn are presented. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Piriápolis, Uruguay
- Average high temperature in September: 15.5°C
The warmest month (with the highest average high temperature) is January (25.3°C).
The month with the lowest average high temperature is July (13.2°C).
- Average low temperature in September: 11.4°C
The month with the highest average low temperature is February (20.3°C).
The coldest month (with the lowest average low temperature) is July (9.7°C).
Average pressure in September
Piriápolis, Uruguay
- Average pressure in September: 1017.9mbar
The month with the highest atmospheric pressure is July (1018.9mbar).
The month with the lowest atmospheric pressure is December (1011.5mbar).
Average wind speed in September
Piriápolis, Uruguay
- Average wind speed in September: 21.3km/h
The windiest months (with the highest average wind speed) are June and September (21.3km/h).
The calmest month (with the lowest average wind speed) is May (19.1km/h).
Average humidity in September
Piriápolis, Uruguay
- Average humidity in September: 79%
The months with the highest relative humidity are July, August and September (79%).
The month with the lowest relative humidity is January (71%).
Average rainfall in September
Piriápolis, Uruguay
- Average rainfall in September: 56mm
The wettest month (with the highest rainfall) is July (74mm).
The driest month (with the least rainfall) is January (44mm).
Average rainfall days in September
Piriápolis, Uruguay
- Average rainfall days in September: 10.2 days
The month with the highest number of rainy days is March (14.3 days).
The months with the least rainy days are June, August and September (10.2 days).
Average sea temperature in September
Piriápolis, Uruguay
- Average sea temperature in September: 12.7°C
The best months for swimming (with the highest average sea temperature) are January and February (22.8°C).
The coldest month (with the lowest average sea temperature) is July (11.8°C).
Average daylight in September /
Average sunshine in September
Piriápolis, Uruguay
- Average daylight in September: 11h and 54min
The month with the longest days is December (Average daylight: 14h and 30min).
The month with the shortest days is June (Average daylight: 9h and 54min).
- Average sunshine in September: 7h and 24min
The month with the most sunshine is January (Average sunshine: 10h and 54min).
The month with the least sunshine is July (Average sunshine: 5h and 24min).
Average sunshine days in September
Piriápolis, Uruguay
- Average sunshine days in September: 17.5 days
The month with the most sunshine days is August (19.3 days).
The month with the least sunshine days is March (13.6 days).
Average UV index in September
Piriápolis, Uruguay
- Average UV index in September: 4
The months with the highest UV index are January, February, March and December (UV index 6).
The month with the lowest UV index is July (UV index 3).
Average cloud cover in September
Piriápolis, Uruguay
- Average cloud cover in September: 38
The month with the most cloud cover is July (Cloud cover 41).
The month with the least cloud cover is January (Cloud cover 22).
Average visibility in September
Piriápolis, Uruguay
- 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).
