Isthmia Weather & Climate: Best Time to Visit

In Isthmia, temperatures differ significantly between summer and winter months. Average daytime temperatures reach a very warm 32°C (90°F) in July. In January, the coolest month of the year, temperatures drop to a moderate 13°C (55°F).

At night, temperatures range from around 23°C (73°F) in July to 7°C (45°F) in January.

Check out our detailed temperature page for more information.

Temperature ranges by month

Isthmia typically sees modest rainfall throughout the year, with an average annual precipitation of 403 mm (16 in). Isthmia can be quite wet during December, receiving approximately 62 mm (2.4 in) of precipitation over 11 rainy days.

In contrast, during the driest month (August), you will experience much drier conditions, with 4 mm (0.2 in) of precipitation spread across 2 rainy days days. For more details, please visit our Isthmia Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

Isthmia can be enjoyed more throughout the sunniest month of July under a blue sky, with approximately 12.1 hours of sunshine daily. In contrast, the city experiences much darker days in December, with only 4.2 hours of sunlight per day.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

The relative humidity is high throughout the year in Isthmia.

The city experiences its highest humidity in November, reaching 73%. In July, the humidity drops to its lowest level at 43%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year