Castries is rarely comfortable to be outside at midday. It comes closest in mid February, and even then it is too hot. For sun, aim for mid November to early July.
When to go five ratings · thirty-six ten-day sections · click a cell to read it
For sun, go from mid November to early July. It peaks in late February, at 77. Avoid September for this: it falls to 27, mostly because it is too hot. The clearest skies come in September, when the sky is typically 59% covered at midday (partly cloudy).
Castries never quite rates Good for being outside. It comes closest in mid February, at 39, mostly because it is too hot. The weakest stretch is from May to early December, when it drops to 0, mostly because it is too hot.
Walking is not what Castries is for: the Active outdoors rating tops out at 2, mostly because it is too warm.
The year, measured
The average temperature in Castries over the whole year is 28°C. September is the hottest month, with highs of about 31°C; February is the coldest, with lows of about 25°C. The rainy (wet) season in Castries runs from June to November, peaking in August with a 40% chance of rain on a given day. The dry season is December to May; April is the driest month, at 16%. Winds in Castries are highest in June, averaging 4.7 m/s (17 km/h), and lightest in October, at 3.0 m/s (11 km/h). The prevailing wind is from the E. The clearest skies in Castries come in September, when the sky is typically 50% covered; June is the cloudiest month, at 62%.
Month by month Castries climate by month: average temperatures year round · click a month to read it
| Month | High | Low | Feels like | Chance of rain | Cloud | Wind | Being outside | Sun | Walking |
|---|---|---|---|---|---|---|---|---|---|
| January | 28°C | 25°C | 29°C | 26% | 54% | 3.9 m/s | 23 | 73 | 0 |
| February | 28°C | 25°C | 29°C | 17% | 53% | 4.3 m/s | 33 | 75 | 1 |
| March | 29°C | 25°C | 29°C | 22% | 52% | 4.2 m/s | 21 | 74 | 0 |
| April | 30°C | 26°C | 30°C | 16% | 54% | 4.1 m/s | 11 | 70 | 0 |
| May | 30°C | 27°C | 32°C | 18% | 61% | 4.6 m/s | 3 | 63 | 0 |
| June | 30°C | 27°C | 32°C | 32% | 62% | 4.7 m/s | 2 | 61 | 0 |
| July | 30°C | 27°C | 32°C | 39% | 58% | 4.2 m/s | 1 | 54 | 0 |
| August | 30°C | 28°C | 33°C | 40% | 53% | 3.7 m/s | 0 | 44 | 0 |
| September | 31°C | 27°C | 34°C | 39% | 50% | 3.3 m/s | 0 | 29 | 0 |
| October | 30°C | 27°C | 33°C | 36% | 51% | 3.0 m/s | 1 | 44 | 0 |
| November | 30°C | 26°C | 32°C | 35% | 53% | 3.2 m/s | 1 | 57 | 0 |
| December | 29°C | 26°C | 31°C | 27% | 50% | 3.8 m/s | 9 | 71 | 0 |
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Castries weather by season
Year round, Castries has days of about 28°C at their warmest in January, its coolest month, and 31°C in September, its warmest; the coolest hours of the day run from 25°C to 28°C through the year, and the average temperature over the year is 28°C around the clock. Rain is most likely around August and least likely around April. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Castries weather in winterDecember to February
Winter in Castries has typical daily highs of about 28°C and lows of about 25°C, with a 24% chance of rain on a given day.
Castries weather in springMarch to May
Spring in Castries has typical daily highs of about 29°C and lows of about 26°C, with a 19% chance of rain on a given day.
Castries weather in summerJune to August
Summer in Castries has typical daily highs of about 30°C and lows of about 27°C, with a 37% chance of rain on a given day.
Castries weather in autumnSeptember to November
Autumn in Castries has typical daily highs of about 30°C and lows of about 27°C, with a 37% chance of rain on a given day.
When is the rainy season in Castries?
The rainy (wet) season in Castries runs from June to November, peaking in August with a 40% chance of rain on a given day. The dry season is December to May; April is the driest month, at 16%.
What time of year is Castries windiest?
Winds in Castries are highest in June, averaging 4.7 m/s (17 km/h), and lightest in October, at 3.0 m/s (11 km/h). The prevailing wind is from the E.
What is the average temperature in Castries year round?
The average temperature in Castries over the whole year is 28°C. September is the hottest month, with highs of about 31°C; February is the coldest, with lows of about 25°C.
Where to go instead in mid July, the weakest time here for being outside
How this is worked out
Every figure is a decade of weather-station observations blended into one typical year, in ten-day sections. The ratings, the chart and the feels-like column are read at midday local solar time. Being outside is the Easy outdoors rating, Sun is Sunbathing and Walking is Active outdoors, each out of 100: Good from 55, Ideal from 80. They describe what a time of year is usually like here, not a forecast. The dotted links open the map at that time of year; set its time of day to midday to see these numbers.