Gros Islet Temperature by Month
Gros Islet, Saint Lucia has a consistently comfortable climate year-round, with daytime highs averaging 30°C (86°F). Below you'll find a full monthly breakdown and a comparison with cities worldwide.
Gros Islet Monthly Temperatures
In Gros Islet temperatures are generally consistent throughout the year. Maximum daytime temperatures range from a comfortable 28°C (82°F) in February to a very warm 31°C (88°F) in September. Nighttime lows 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 Gros Islet by month:
Low temperatures are most often recorded between 4 AM and 6 AM, while highs typically occur around 3 PM. September, the city's warmest month, sees 238 hours of sunshine.
The chart below shows the average temperature throughout the year:
Daily Historical Temperatures
50-year average (1976-2025)
Average high and low temperatures for each day of the month based on long-term records.
Average temperatures in June
Historical Gros Islet Temperatures: 1976-2026
Browse day-by-day temperature records for Gros Islet spanning 51 years. Select any month and year to see actual high and low temperatures recorded on each day.
Temperature: Gros Islet vs Saint Lucia
The map below shows the annual temperature across Saint Lucia. You can also select individual months if you want to compare a specific time of year.
very warm
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pleasant
moderate
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Gros Islet vs World: Temperature Compared
Gros Islet's average annual maximum temperature is 30°C (86°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.
San Francisco, USA averages 19°C (66°F) annually, but with little seasonal variation — summers are often cool and foggy, winters mild.
Brisbane, Australia averages 26°C (79°F) a year, with warm winters and hot, humid summers.
What Does the Temperature Feel Like in Gros Islet?
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 Gros Islet, 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 31°C (88°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.
Whether a city sits on the coast or deep inland makes a significant difference to its climate. Coastal areas tend to have more stable temperatures year-round — large bodies of water absorb heat slowly in summer and release it gradually in winter, keeping extremes in check. Cities far from the sea don't benefit from that buffer, which is why continental climates tend to have hotter summers and colder winters than their coastal counterparts at the same latitude.
For more on Gros Islet's weather — including monthly rainfall, sunshine hours, and humidity — visit our Gros Islet climate page.
