Sandy Ground, Saint Martin experiences average highs of 27°C (81°F) and lows of 26°C (79°F) throughout the year. Rainfall is moderate, averaging about 12 rainy days per month. Sunshine is abundant, averaging about 11 hours per day. High humidity combined with warm temperatures produces a tropical feel year-round. Average highs have stayed broadly stable across the available records.
Sandy Ground, Saint Martin Weather & Climate 2026
Monthly climate averages for Sandy Ground, Saint Martin. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Jan–Dec 
Wetter season: Jul–Nov At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
7.3/10
Best: January, February, March, April, December
UV Index
8
High
Temperature 27°C / 26°C
Feels Like 30°C / 27°C
Rainy Days 12
Rainfall 66 mm
Sunshine 11 h
Humidity 79%
Wind Speed 29 km/h
Dew Point 22°C
Hottest Month
29°C
September
Avg Low27°C
Rain17days
Coldest Month
24°C
February
Avg High26°C
Rain8days
Driest Month
8days
February
Avg High26°C
Avg Low24°C
Windiest Month
33 km/h
July (Gusts 44)
Sea Temperature
27°C – 30°C
Warmest water: September (
30°C
)
Worst Time to Visit
Consider avoiding July, August, September, October due to heavy rainfall, oppressive humidity.
Sun Position
Sunrise 05:38
Daylight 13.2h
Sunset 18:50
Live conditions—
Sandy Ground on the map · live conditions
Sandy Ground, Saint Martin
- Continent
- Americas
- Country
- Saint Martin
- City
- Sandy Ground
- Population
- 3.5K
- Coordinates
- 18.06°, -63.10°
Seasonal Breakdown
Spring
Mar–May
Avg High 26°C
Avg Low 25°C
Rain 9 days/mo
2/3 best months
Summer
Jun–Aug
Avg High 28°C
Avg Low 27°C
Rain 13 days/mo
Autumn
Sep–Nov
Avg High 28°C
Avg Low 27°C
Rain 16 days/mo
Winter
Dec–Feb
Avg High 26°C
Avg Low 25°C
Rain 10 days/mo
3/3 best months
Climate Charts
Based on historical averages (2016–2025)
Monthly Temperatures
HighLowShaded bands show the typical range across the available yearly records.
Line chart showing monthly temperatures. Jan: 26°C / 25°C . Feb: 26°C / 24°C . Mar: 26°C / 25°C . Apr: 26°C / 25°C . May: 27°C / 26°C . Jun: 28°C / 26°C . Jul: 28°C / 27°C . Aug: 28°C / 27°C . Sep: 29°C / 27°C . Oct: 28°C / 27°C . Nov: 27°C / 26°C . Dec: 27°C / 25°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 29 mm. Feb: 36 mm. Mar: 22 mm. Apr: 40 mm. May: 48 mm. Jun: 43 mm. Jul: 76 mm. Aug: 88 mm. Sep: 135 mm. Oct: 129 mm. Nov: 106 mm. Dec: 37 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 77%. Feb: 77%. Mar: 76%. Apr: 78%. May: 80%. Jun: 80%. Jul: 81%. Aug: 81%. Sep: 81%. Oct: 80%. Nov: 80%. Dec: 77%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 30 km/h . Feb: 31 km/h . Mar: 29 km/h . Apr: 28 km/h . May: 29 km/h . Jun: 31 km/h . Jul: 33 km/h . Aug: 30 km/h . Sep: 27 km/h . Oct: 26 km/h . Nov: 27 km/h . Dec: 30 km/h .
Sunshine
Sunshine
Sunshine: Jan: 10h. Feb: 11h. Mar: 11h. Apr: 11h. May: 12h. Jun: 12h. Jul: 12h. Aug: 11h. Sep: 11h. Oct: 10h. Nov: 10h. Dec: 10h.
Sea Temperature
Sea Temperatureswim
Line chart showing monthly sea temperature. Jan: 27°C . Feb: 27°C . Mar: 27°C . Apr: 27°C . May: 28°C . Jun: 29°C . Jul: 29°C . Aug: 30°C . Sep: 30°C . Oct: 30°C . Nov: 29°C . Dec: 28°C .
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 7. Feb: UV 8. Mar: UV 9. Apr: UV 9. May: UV 9. Jun: UV 9. Jul: UV 9. Aug: UV 9. Sep: UV 9. Oct: UV 8. Nov: UV 7. Dec: UV 6.
Monthly Daylight Hours
Daylight12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy
Climate Trends
Average highs have stayed broadly stable across the available records. Average rainfall has remained broadly steady.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | — | Sep · 29°C |
| Coldest month | — | Feb · 24°C |
| Wettest month | Oct 2025 · 209 mm | Sep · 135 mm |
| Windiest month | Feb 2025 · 35 km/h | Jul · 33 km/h |
Month-by-Month Weather Table
January best
Excellent 
February best
Excellent March best
Excellent April best
Excellent May
Good June
Good July
Fair August
Fair September
Fair October
Fair November
Good December best
Excellent | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January best | 26°C / 25°C | 27°C / 25°C | 11days (29 mm) Wet | 10.4h Excellent | 77% Humid | 6.7 High | Excellent | View Details |
| February best | 26°C / 24°C | 27°C / 24°C | 8days (36 mm) Wet | 10.7h Excellent | 77% Humid | 7.6 Very High | Excellent | View Details |
| March best | 26°C / 25°C | 28°C / 25°C | 8days (22 mm) Wet | 11.1h Excellent | 76% Humid | 8.7 Very High | Excellent | View Details |
| April best | 26°C / 25°C | 29°C / 26°C | 10days (40 mm) Wet | 11.4h Excellent | 78% Humid | 9 Very High | Excellent | View Details |
| May | 27°C / 26°C | 30°C / 27°C | 10days (48 mm) Wet | 11.7h Excellent | 80% Humid | 8.8 Very High | Good | View Details |
| June | 28°C / 26°C | 31°C / 28°C | 10days (43 mm) Wet | 11.8h Excellent | 80% Humid | 8.6 Very High | Good | View Details |
| July | 28°C / 27°C | 31°C / 28°C | 16days (76 mm) Wet | 11.7h Excellent | 81% Humid | 8.7 Very High | Fair | View Details |
| August | 28°C / 27°C | 32°C / 29°C | 14days (88 mm) Wet | 11.2h Excellent | 81% Humid | 8.8 Very High | Fair | View Details |
| September | 29°C / 27°C | 33°C / 30°C | 17days (135 mm) Wet | 10.7h Excellent | 81% Humid | 8.5 Very High | Fair | View Details |
| October | 28°C / 27°C | 32°C / 29°C | 16days (129 mm) Wet | 10.1h Excellent | 80% Humid | 7.5 Very High | Fair | View Details |
| November | 27°C / 26°C | 30°C / 28°C | 15days (106 mm) Wet | 9.6h Good | 80% Humid | 6.6 High | Good | View Details |
| December best | 27°C / 25°C | 28°C / 26°C | 11days (37 mm) Wet | 10h Excellent | 77% Humid | 6.3 High | Excellent | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Sandy Ground are January, February, March, April, December, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Sandy Ground, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Sandy Ground is September, with average daytime highs of 29°C (83°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Sandy Ground is February, with average overnight lows of 24°C (76°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Sandy Ground is September, averaging 135mm of precipitation across 17 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Sandy Ground runs through September, July, October, November, with the heaviest rainfall in September. Based on 10-year averages for Sandy Ground.
Sandy Ground receives approximately 130 sunshine hours per year. The sunniest month is June with around 12 hours. Based on climate data for Sandy Ground.
The least favorable months to visit Sandy Ground are July, August, September, October, primarily due to heavy rainfall, oppressive humidity. For the best conditions, consider January, February, March, April, December instead.
The annual average UV index in Sandy Ground is 8, classified as high. SPF 30+ sunscreen, sunglasses, and seeking shade between 10:00–16:00 are strongly recommended.
Average humidity in Sandy Ground is 79%, classified as humid. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Yes — sea temperatures in January, February, March, April, May, June, July, August, September, October, November, December average 28°C (82°F), which is warm and comfortable for swimming and water activities.
Average wind speeds in Sandy Ground are 29 km/h (18 mph). The windiest month is July with peak winds reaching 33 km/h (20 mph) (gusts up to 44 km/h / 27 mph).
Sandy Ground averages 6 clear-sky days per month with overall cloud cover around 43%. The clearest skies occur in December.
The annual average dew point in Sandy Ground is 22°C (72°F), which feels muggy and uncomfortable. Expect heavy perspiration during warmer months — stay hydrated and take breaks in air-conditioned spaces.
Sandy Ground has a Tropical Monsoon climate, classified as Am under the Köppen system. Tropical climates are warm year-round with high rainfall and temperatures rarely dropping below 18°C (64°F).
The 'feels like' temperature in Sandy Ground ranges from 27°C (81°F) to 30°C (86°F) on average. Humidity and radiant heat mean it often feels warmer than the thermometer reads, especially in summer months.
Yes, June is a great time to visit Sandy Ground. It earns a climate score of 6.7/10 with Good.
For June in Sandy Ground, pack Umbrella, Waterproof jacket, Breathable clothing, Sunscreen (SPF 30+), Sun hat. With average highs of 28°C (82°F) and 10 rainy days, these essentials will keep you comfortable.
Data Source
Climate data derived from ERA5 reanalysis (ECMWF), averaged over 2016–2025. Sea surface temperature from marine reanalysis data. Climate scores and seasonal estimates are computed by WorldStats.
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