Mon Repos Temperature by Month

The average annual maximum temperature in Mon Repos, Castries, Saint Lucia is 29°C (84°F), with little variation between seasons. This page covers monthly averages, day-night differences, and how Mon Repos compares to cities worldwide.

Year-round, Mon Repos experiences a consistently comfortable climate. Maximum daytime temperatures range from a very warm 30°C (86°F) in September to a comfortable 28°C (82°F) in the coolest month, February. Nighttime temperatures range from 26°C (79°F) in September to 24°C (75°F) in February.

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

The coolest part of the day is typically between 4 AM and 6 AM, while 3 PM is usually the warmest, when solar heating is at its peak. September, the city's warmest month, averages 238 hours of sunshine.

The chart below shows the average temperature throughout the year:

Mon Repos's average annual maximum temperature is 29°C (84°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.

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

Perth, Australia averages 25°C (77°F) annually, with a classic Mediterranean climate, hot dry summers and mild wet winters.

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 Mon Repos, February is the coolest month, with average highs of 28°C (82°F) and humidity around 79%, considered high. In September, the warmest month, temperatures average 30°C (86°F) with 81% humidity, conditions that feel very high. 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.

Global average temperatures have risen by around 1.2°C since the pre-industrial era, and the effects are visible across many regions. Winters are milder on average, with fewer frost days and less snow in many parts of the world. Heatwaves are more frequent and more intense, and Europe's summers of 2018, 2019, and 2020 all set records.

Summers are also getting drier in some areas, while winter rainfall has increased in others. This contributies to higher river levels and more flooding. In many countries, spring arrives earlier and autumn lasts longer. It has knock-on effects for wildlife, agriculture, and local ecosystems.

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