Isernia Temperature by Month

Isernia in Molise, Italy sees significant seasonal temperature differences, with daytime highs between 8°C (46°F) in January and 27°C (81°F) in August, averaging 17°C (63°F) annually. Explore the full monthly breakdown below.

Visitors to Isernia can expect significant temperature changes throughout the year. Nighttime temperatures also vary widely, ranging from 16°C (61°F) in August to 0°C (32°F) in January.

The chart below illustrates the average maximum day and minimum night temperatures in Isernia by month:

Temperatures tend to bottom out between 4 AM and 6 AM, then climb to their daily peak around 3 PM. August, the warmest month, sees 262 hours of sunshine.

The chart below shows the average temperature throughout the year:

Isernia's average annual maximum temperature is 17°C (63°F). To put that in context, here's how it compares to a few well-known destinations:

Lisbon, Portugal averages 21°C (70°F) annually, warm summers, mild winters, and rain mainly in the cooler months.

Interlaken, Switzerland averages 8°C (46°F) a year, with cold winters and cool summers thanks to its Alpine setting.

Chicago, USA averages 15°C (59°F) annually, known for extreme seasonal swings, from bitterly cold winters to warm summers.

Brisbane, Australia averages 26°C (79°F) a year, with warm winters and hot, humid summers.

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 Isernia, January is the coolest month, with average highs of 8°C (46°F) and humidity around 74%, considered high. In August, the warmest month, temperatures average 27°C (81°F) with 59% 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.

For cities and regions with significant elevation, altitude is one of the biggest factors shaping local temperatures. As a rule of thumb, temperatures fall by around 6°C for every 1,000 metres gained, so a city at 2,000 metres will typically be around 12°C cooler than a city at sea level in the same region. Higher ground also tends to see more dramatic day-to-night temperature swings, since thinner air loses heat faster after sunset.

For more on Isernia's weather, including monthly rainfall, sunshine hours, and humidity, visit our Isernia climate page.