Isthmia Temperature by Month
The average annual maximum temperature in Isthmia, Peloponnese, Greece is 22°C (72°F), with daytime highs ranging from 13°C (55°F) in January to 32°C (90°F) in July. This page covers monthly averages, day-night differences, and how Isthmia compares to cities worldwide.
Isthmia Monthly Temperatures
The weather in Isthmia experiences significant differences between warm and cold seasons, with big shifts in temperature. At night, minimum temperatures range from 23°C (73°F) in July to 7°C (45°F) in January.
The chart below illustrates the average maximum day and minimum night temperatures in Isthmia by month:
Daily lows are most common between 4 AM and 6 AM. By 3 PM temperatures reach their daily high, driven by peak solar heating. July, the warmest month of the year, receives 364 hours of sunshine.
The chart below shows the average temperature throughout the year:
Temperature: Isthmia vs Greece
The map below shows the annual temperature across Greece. You can also select individual months if you want to compare a specific time of year.
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Isthmia vs World: Temperature Compared
Isthmia's average annual maximum temperature is 22°C (72°F). To put that in context, here's how it compares to a few well-known destinations:
Rome, Italy averages 20°C (68°F) annually, with reliably warm summers and comfortable winters.
On the cooler end, Oslo, Norway averages just 10°C (50°F) annually, with pleasant summers but long, cold winters.
San Francisco, USA averages 19°C (66°F) annually, but with little seasonal variation — summers are often cool and foggy, winters mild.
Tokyo, Japan averages 21°C (70°F) a year, with hot summers, cool winters, and a well-defined cherry blossom spring.
What Does the Temperature Feel Like in Isthmia?
Temperature alone doesn't tell the whole story — humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.
In the cooler months, when temperatures drop below 10°C, high humidity makes the cold feel more cutting than it would in dry conditions.
In Isthmia, January is the coolest month, with average highs of 13°C (55°F) and humidity around 72% — considered high. In July, the warmest month, temperatures average 32°C (90°F) with 43% humidity — conditions that feel moderate. For a full picture, see our humidity page.
Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.
The readings come from a range of sources — land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.
Seasonal temperature shifts influence more than just how warm it feels — they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.
Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in Isthmia this rarely lasts long on the ground.
For more on Isthmia's weather — including monthly rainfall, sunshine hours, and humidity — visit our Isthmia climate page.
