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Monthly climate in Willemstad, Netherlands

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Willemstad features a oceanic climate (Cfb). Temperatures typically range between 5 °C (40 °F) and 19 °C (66 °F) through the year, but rarely can drop to -10 °C (15 °F) or can rise to as high as 39 °C (102 °F). The average annual precipitation amounts to about 839 mm (33.0 inches) and receives 150 rainy days on the 1 mm (0.04 inches) threshold annually. Willemstad enjoys an average of 3523 hours of sunshine throughout the year, and daylight varies from 7 hours 50 minutes to 16 hours 36 minutes per day.

Monthly average temperatures in Willemstad, Netherlands

The warmest months in Willemstad are June, July and August, with daily mean temperatures ranging from 18 to 19 °C (64 - 66 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 5 to 6 °C (40 - 43 °F) throughout the day. On average each year, Willemstad experiences 19 days above 25 °C (77.0 °F) and 23 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Willemstad. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum14°C
(58°F)		18°C
(65°F)		22°C
(72°F)		27°C
(82°F)		31°C
(88°F)		32°C
(90°F)		39°C
(102°F)		34°C
(94°F)		31°C
(89°F)		26°C
(78°F)		19°C
(66°F)		14°C
(58°F)
Mean maximum12°C
(54°F)		15°C
(59°F)		18°C
(65°F)		23°C
(74°F)		26°C
(79°F)		28°C
(82°F)		31°C
(87°F)		31°C
(87°F)		27°C
(80°F)		22°C
(72°F)		16°C
(61°F)		13°C
(56°F)
Average high7°C
(44°F)		8°C
(47°F)		11°C
(52°F)		14°C
(58°F)		18°C
(64°F)		22°C
(72°F)		22°C
(73°F)		23°C
(73°F)		19°C
(67°F)		15°C
(60°F)		10°C
(51°F)		8°C
(46°F)
Daily mean5°C
(40°F)		5°C
(42°F)		7°C
(45°F)		10°C
(50°F)		13°C
(56°F)		18°C
(64°F)		18°C
(66°F)		19°C
(66°F)		15°C
(60°F)		12°C
(54°F)		8°C
(46°F)		6°C
(43°F)
Average low2°C
(37°F)		2°C
(37°F)		3°C
(39°F)		5°C
(42°F)		9°C
(48°F)		13°C
(56°F)		14°C
(58°F)		14°C
(58°F)		11°C
(53°F)		10°C
(50°F)		5°C
(42°F)		4°C
(39°F)
Mean minimum-3°C
(27°F)		-4°C
(25°F)		-2°C
(28°F)		-1°C
(30°F)		2°C
(37°F)		9°C
(48°F)		10°C
(50°F)		10°C
(50°F)		6°C
(42°F)		4°C
(39°F)		-1°C
(31°F)		-2°C
(28°F)
Minimum-7°C
(19°F)		-10°C
(15°F)		-8°C
(19°F)		-2°C
(28°F)		1°C
(34°F)		8°C
(46°F)		8°C
(46°F)		9°C
(48°F)		3°C
(38°F)		2°C
(36°F)		-2°C
(29°F)		-4°C
(24°F)

Compare climate in Willemstad with other places

Compare temperature, precipitation, sunshine, UV index in Willemstad, Netherlands with other places around the world.

Monthly average precipitation in Willemstad, Netherlands

Willemstad usually has the most precipitation in August, October and December, with an average of 15 rainy days and 88 mm (3.5 inches) of precipitation per month. The driest months in Willemstad are January, April and November. On average, 52 mm (2.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Willemstad. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)59 (2.3)65 (2.6)70 (2.8)43 (1.7)66 (2.6)73 (2.9)77 (3.0)85 (3.3)66 (2.6)89 (3.5)55 (2.2)92 (3.6)
Average precipitation days (≥ 1 mm)12121491210131411141217

Monthly sunshine hours in Willemstad, Netherlands

The sunniest months in Willemstad are May, June and July, when the sun shines an average of 13 hours 32 minutes a day. Least sunny months in Willemstad: January, November and December receive an average of 5 hours 2 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Willemstad. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours120205280359408414421394328246195147
Mean daily daylight hours8h 21m9h 57m11h 55m13h 55m15h 40m16h 36m16h 6m14h 32m12h 35m10h 35m8h 48m7h 50m

Solar UV radiation in Willemstad, Netherlands

Willemstad experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 7 - 8, which corresponds to the High / Very High category of sun exposure. January, February and December are in the Low exposure category. In these months, the maximum values of the UV index do not exceed 2. For more detailed information, check out our hourly Willemstad UV Index data.

Average daily maximum UV levels by month for Willemstad. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)124578875321