Happy Bay Weather in September
September in Happy Bay typically sees daytime highs of 30°C (86°F) and nighttime lows of 27°C (81°F). Rainfall is also possible this month, so it's worth packing an umbrella.
Rainfall in Happy Bay in September
Looking at the last 30 years, the data shows about 19 days with rain, averaging 134 mm (5.3 in) for the month. Wet weather is a regular and significant part of this month. Frequent days of rain combined with high totals means proper waterproofs are worth packing.
Temperature in Happy Bay in September
If you're visiting Happy Bay in September, expect highs of 30°C (86°F) and overnight lows around 27°C (81°F). This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. With lows of 27°C (81°F), it stays warm throughout the night. A cold shower before going to sleep is one of the easiest ways to cool down before bed.
Sunshine in Happy Bay in September
Expect a lot of sunshine this month, with about 232 hours of sun. These sunny conditions add to the overall experience.
Wind Speed in Happy Bay in September
Average wind conditions reach 5 m/s (10 knots) in September. This creates lively weather with fresh winds that make small trees sway noticeably. Remember this is an average: some days are less windy while others have particularly active windy conditions.
Average water temperature in September
The water is 29°C (84°F) — very warm by most standards. Comfortable to swim in, but not particularly refreshing if you're looking to cool off.Our weather planner can help you find worldwide destinations with pleasant weather during this period. January, February, March, April, May, June, July and December typically offer the best weather for Happy Bay.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Saint Martin, check out our Happy Bay's climate page.
Happy Bay Temperature in September
Min Temperature
27°C (81°F)
Max Temperature
30°C (86°F)
Water Temperature
29°C (84°F) *
Chance of Rain
62%
Precipitation
134 mm (5.3 in)
Rainy days
19 days
Humidity
78% *
Windspeed
5 m/s (10 knots) *
Sunshine
232 hours *
Percentage Sunshine
61% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Happy Bay typically stay consistent throughout September, with daily highs averaging around 30°C (86°F). Nights are warm, with lows around 27°C (81°F).
Average temperatures in September
Historical weather for Happy Bay in September
Browse day-by-day weather records for Happy Bay spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Happy Bay historical weather extremes in September
According to our 35 years of weather records for Happy Bay, the following extremes were recorded between 1990 and 2025.
- Happy Bay recorded its highest September temperature of 36°C (97°F) on September 3, 1992.
- On September 4, 2009, Happy Bay saw its coldest September day with temperatures maxing out at 27°C (81°F).
- Nighttime temperatures dropped to 22°C (72°F) on September 30, 2017, marking the coldest September night on record.
Best Places in Saint Martin in September
Find out more about the weather in Saint Martin and which places have the best travel conditions in this month. See all of Saint Martin in September →
perfect weather
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unpleasant
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What to Wear in Happy Bay in September
Warm temperatures in September make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Prepare for significant rainfall with proper waterproof clothing and shoes. Expect water temperatures of around 29°C (84°F), which is ideal for taking a refreshing dip. Bring swimwear and consider packing a towel for drying off. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.What To Do in Happy Bay in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Saint Martin, check out our Happy Bay's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Happy Bay climate overview or explore weather in Saint Martin.
