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Monthly climate in Hennef, Germany

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Hennef features a oceanic climate (Cfb). Temperatures typically range between 3 °C (38 °F) and 19 °C (67 °F) through the year, but rarely can drop to -11 °C (13 °F) or can rise to as high as 40 °C (104 °F). The average annual precipitation amounts to about 917 mm (36.1 inches) and receives 158 rainy days on the 1 mm (0.04 inches) threshold annually. Hennef enjoys an average of 3312 hours of sunshine throughout the year, and daylight varies from 8 hours 2 minutes to 16 hours 23 minutes per day.

Monthly average temperatures in Hennef, Germany

The warmest months in Hennef are June, July and August, with daily mean temperatures ranging from 19 to 19 °C (66 - 67 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 3 to 5 °C (38 - 41 °F) throughout the day. On average each year, Hennef experiences 36 days above 25 °C (77.0 °F) and 31 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Hennef. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum14°C
(57°F)		20°C
(68°F)		22°C
(73°F)		27°C
(80°F)		33°C
(91°F)		35°C
(95°F)		40°C
(104°F)		36°C
(97°F)		33°C
(92°F)		26°C
(79°F)		20°C
(68°F)		15°C
(59°F)
Mean maximum12°C
(53°F)		15°C
(60°F)		19°C
(66°F)		24°C
(75°F)		28°C
(82°F)		29°C
(85°F)		32°C
(90°F)		32°C
(90°F)		29°C
(85°F)		22°C
(72°F)		17°C
(63°F)		14°C
(57°F)
Average high5°C
(41°F)		8°C
(46°F)		11°C
(52°F)		15°C
(59°F)		18°C
(65°F)		23°C
(74°F)		24°C
(76°F)		24°C
(76°F)		20°C
(68°F)		15°C
(59°F)		9°C
(49°F)		7°C
(44°F)
Daily mean3°C
(38°F)		4°C
(40°F)		7°C
(44°F)		10°C
(50°F)		14°C
(57°F)		19°C
(66°F)		19°C
(67°F)		19°C
(67°F)		15°C
(60°F)		12°C
(53°F)		7°C
(44°F)		5°C
(41°F)
Average low1°C
(34°F)		2°C
(35°F)		3°C
(38°F)		5°C
(42°F)		9°C
(48°F)		14°C
(57°F)		15°C
(59°F)		15°C
(59°F)		11°C
(52°F)		9°C
(48°F)		4°C
(40°F)		3°C
(37°F)
Mean minimum-4°C
(25°F)		-5°C
(24°F)		-4°C
(26°F)		-2°C
(29°F)		2°C
(36°F)		9°C
(48°F)		10°C
(50°F)		9°C
(49°F)		5°C
(42°F)		3°C
(37°F)		-1°C
(30°F)		-4°C
(26°F)
Minimum-8°C
(17°F)		-11°C
(13°F)		-10°C
(14°F)		-3°C
(26°F)		0°C
(33°F)		8°C
(46°F)		8°C
(47°F)		7°C
(45°F)		2°C
(36°F)		1°C
(33°F)		-4°C
(25°F)		-5°C
(23°F)

Compare climate in Hennef with other places

Compare temperature, precipitation, sunshine, UV index in Hennef, Germany with other places around the world.

Monthly average precipitation in Hennef, Germany

Hennef usually has the most precipitation in March, July and December, with an average of 15 rainy days and 98 mm (3.9 inches) of precipitation per month. The driest months in Hennef are April, September and November. On average, 53 mm (2.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Hennef. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)83 (3.3)79 (3.1)85 (3.3)39 (1.5)73 (2.9)67 (2.6)91 (3.6)82 (3.2)61 (2.4)80 (3.2)59 (2.3)118 (4.7)
Average precipitation days (≥ 1 mm)14121691311111510141320

Monthly sunshine hours in Hennef, Germany

The sunniest months in Hennef are May, June and July, when the sun shines an average of 12 hours 55 minutes a day. Least sunny months in Hennef: January, November and December receive an average of 4 hours 18 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Hennef. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours105199263340388392408379314230172117
Mean daily daylight hours8h 31m10h 2m11h 55m13h 50m15h 30m16h 23m15h 55m14h 25m12h 34m10h 39m8h 56m8h 2m

Solar UV radiation in Hennef, Germany

Hennef 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 Hennef UV Index data.

Average daily maximum UV levels by month for Hennef. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)124578875421