Climate Overview
The climate in Castries is hot. The average annual temperature is 27°C and approximately 933mm of precipitation falls per year. Castries receives a notable amount of rainfall throughout the year, including during its driest month. Castries is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: September, August, July. The coldest months are February, January, March, when temperatures can drop to 24°C.
Temperature
Castries has relatively stable temperatures year-round, staying within a 6°C range. The warmest month is September, when average highs reach 30°C and the mean temperature sits around 28°C. February is the coolest month, with minimum temperatures around 24°C and an average of 26°C. Daily temperature variation is modest, with an average difference of 4°C between highs and lows.
Precipitation
Castries is a moderately rainy area, receiving approximately 933mm of precipitation annually, which averages out to around 78mm per month. The wettest month is September, averaging 148mm of rainfall. November and October also tend to see above-average precipitation. The driest month is February, with just 32mm. That's 116mm less than September, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall.
Wind
Castries is relatively calm, with an average annual wind speed of 6km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is June, averaging 6km/h, though still comfortable for most outdoor activities. The calmest conditions occur in September, with average winds dropping to 5km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 1km/h between the calmest and windiest months.
Seasons
93 days until Autumn
It is currently summer in Castries, which began on June 21, 2026. Castries is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in September at around 30°C, while the coldest stretch bottoms out in February near 24°C. Autumn is next, beginning on September 23, 2026 — 93 days from now.
Spring
Temperatures range from 24 to 30°C. Rainfall is relatively light, with around 120mm over the season and a monthly average of 40mm. Winds are generally light, averaging 6km/h. Light layers work well as temperatures warm through the season — a great time to be outdoors.
Summer
Temperatures range from 26 to 30°C. Precipitation is moderate at around 263mm for the season, averaging 88mm per month. Winds are generally light, averaging 6km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 25 to 30°C. Rainfall is heavy, totalling around 426mm across the season with a monthly average of 142mm. Winds are generally light, averaging 5km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 24 to 28°C. Rainfall is relatively light, with around 125mm over the season and a monthly average of 42mm. Winds are generally light, averaging 6km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.
Monthly Climate Data
The table below shows monthly climate averages for Castries based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.
