nomadseason

September Weather in Islandia, United States

Last updated: June 24, 2025

In September, the average temperature in Islandia, United States is a pleasant 21°C (70°F). However, prepare for some variability, as temperatures can dip to a minimum of 12°C (53°F) and reach a maximum of 29°C (85°F). The month sees an average precipitation of 96 mm (3.8 in) spread over 10 days, while the humidity hovers at a comfortable 68%.

September Temperature in Islandia

In September in Islandia, the average temperature is 21°C (70°F). Maximums can reach 29°C (85°F), while minimums can drop to as low as 12°C (53°F). This mild climate makes Islandia an ideal destination for travelers seeking pleasant weather and comfortable conditions for outdoor activities.

September Weather in Islandia: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Islandia, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Islandia, September typically has an average temperature of 21°C (70°F), with highs reaching up to 29°C (85°F) and lows dropping to around 12°C (53°F).
JanFebMarAprMayJunJulAugSepOctNovDec363740485768757570614941
Data source: Temperature data for Islandia generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Islandia

In Islandia in September, the total precipitation amount is 96 mm (3.8 in) over a span of 10 days.

September Precipitation Trends in Islandia

The chart displays monthly precipitation patterns in Islandia, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Islandia, September typically receives around 96 mm (3.8 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec831181071301238613010996142105138
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Islandia

In Islandia in September humidity is 68%. With an average temperature of 21°C (70°F), this humidity feels like a warm embrace, making the air feel slightly heavy and sticky, which can be quite exhausting for travelers.

September Average Humidity in Islandia

This chart illustrates the average monthly humidity levels in Islandia, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Islandia is approximately 68%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%81%78%70%69%62%65%68%74%82%80%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Islandia

In Islandia in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Islandia.

Maximum UV Index Levels in Islandia for September

The chart shows the monthly maximum UV Index (UVI) for Islandia in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Islandia typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356810101098642
Data source: Islandia September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Islandia Compares to Other Months

Weather in Islandia varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Islandia, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Islandia, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (36°F)82 mm (3.2 inches)84%moderate
February Weather3°C (37°F)118 mm (4.6 inches)82%moderate
March Weather5°C (41°F)107 mm (4.2 inches)81%high
April Weather9°C (49°F)130 mm (5.1 inches)78%very high
May Weather14°C (58°F)123 mm (4.9 inches)69%very high
June Weather20°C (68°F)86 mm (3.4 inches)69%very high
July Weather24°C (76°F)130 mm (5.1 inches)62%very high
August Weather24°C (75°F)109 mm (4.3 inches)65%very high
September Weather21°C (70°F)96 mm (3.8 inches)68%very high
October Weather16°C (61°F)142 mm (5.6 inches)74%high
November Weather9°C (49°F)105 mm (4.1 inches)82%moderate
December Weather5°C (41°F)138 mm (5.4 inches)80%low

Compare Islandia's Climate with Cities Worldwide