September Weather in Isthmia, Greece

Last updated: August 23, 2025

In Isthmia, Greece, the average temperature in September is a pleasant 24°C (75°F). Expect minimums of 15°C (59°F) and maximums reaching 33°C (91°F). With an average humidity of 65%, the air feels comfortably warm. However, be prepared for some rain, as the area receives an average precipitation of 29 mm (1.2 in) over 2 days.

September Temperature in Isthmia

In September, in Isthmia, the average temperature is a pleasant 24°C (75°F). The maximum can reach a warm 33°C (91°F), while the minimum can drop to a cooler 15°C (59°F). This makes Isthmia an ideal destination for travelers seeking mild weather and comfortable conditions.

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

The chart illustrates September temperature patterns in Isthmia, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Isthmia, September typically has an average temperature of 24°C (75°F), with highs reaching up to 33°C (91°F) and lows dropping to around 15°C (59°F).

Data source: Temperature data for Isthmia generated using information from the Copernicus Climate Change Service.

September Precipitation in Isthmia

In Isthmia in September, the precipitation amount is 29 mm (1.2 in) over a period of 2 days.

September Precipitation Trends in Isthmia

The chart displays monthly precipitation patterns in Isthmia, 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 Isthmia, September typically receives around 29 mm (1.2 inches) of precipitation spread over approximately 2 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Isthmia

In Isthmia in September humidity is 65%. With average temperature 24°C (75°F), this humidity feels like a warm blanket enveloping you, making outdoor activities a bit sticky but still enjoyable for exploring sights and sounds.

September Average Humidity in Isthmia

This chart illustrates the average monthly humidity levels in Isthmia, 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 Isthmia is approximately 65%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Isthmia

In Isthmia 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 Isthmia.

Maximum UV Index Levels in Isthmia for September

The chart shows the monthly maximum UV Index (UVI) for Isthmia 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 Isthmia typically reaches 8, which falls under the very high exposure category.

Data source: Isthmia 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 Isthmia Compares to Other Months

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

This table compares monthly weather conditions in Isthmia, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	9°C (48°F)	61 mm (2.4 inches)	76%	moderate
February Weather	10°C (51°F)	58 mm (2.3 inches)	75%	moderate
March Weather	11°C (53°F)	49 mm (1.9 inches)	74%	high
April Weather	15°C (58°F)	40 mm (1.6 inches)	75%	very high
May Weather	19°C (67°F)	22 mm (0.9 inches)	77%	very high
June Weather	23°C (74°F)	21 mm (0.8 inches)	71%	extreme
July Weather	27°C (80°F)	5 mm (0.2 inches)	68%	very high
August Weather	27°C (81°F)	4 mm (0.2 inches)	63%	very high
September Weather	24°C (75°F)	29 mm (1.2 inches)	65%	very high
October Weather	19°C (66°F)	42 mm (1.6 inches)	72%	high
November Weather	15°C (59°F)	50 mm (2.0 inches)	75%	moderate
December Weather	11°C (53°F)	61 mm (2.4 inches)	76%	moderate