Trend at 11 days — beyond 10 days the forecast is only guidance (GFS model tail), not a precise value. Deviations of several degrees are possible.
Morning
Partly cloudy
2°
Feels like 2°
Wind↑ SE 4 km/h
Humidity 89 %
Evening
Clear sky
4°
Feels like 4°
Wind↑ SE 3 km/h
Humidity 80 %
Trend at 12 days — beyond 10 days the forecast is only guidance (GFS model tail), not a precise value. Deviations of several degrees are possible.
Morning
Clear sky
1°
Feels like 1°
Wind↑ SE 2 km/h
Humidity 91 %
Evening
Mainly clear
3°
Feels like 3°
Wind↑ SW 2 km/h
Humidity 87 %
Trend at 13 days — beyond 10 days the forecast is only guidance (GFS model tail), not a precise value. Deviations of several degrees are possible.
Morning
Overcast
6°
Feels like 4°
Wind↑ W 6 km/h
Gusts21 km/h
Humidity 90 %
💧 0.1 mm
Evening
Overcast
6°
Feels like 6°
Wind↑ SW 3 km/h
Humidity 90 %
💧 0.1 mm
Trend at 14 days — beyond 10 days the forecast is only guidance (GFS model tail), not a precise value. Deviations of several degrees are possible.
Morning
Mainly clear
3°
Feels like 3°
Wind↑ S 3 km/h
Humidity 97 %
Weather charts for Hennef (Sieg) · 7 days
Temperatures over 7 days
≈ Temperatures close to seasonal normals
Highs Lows Seasonal normal (1991-2020 average)
Hourly detail
Temperature (°C) Precipitation (mm) Wind (km/h)
Climate of Hennef (Sieg)
Daylight lasts 16 h 30 min at the June solstice and 7 h 57 min at the December solstice.
Only January has average lows below freezing (0 °C).
Rain is spread through the year: every month gets between 60 mm and 103 mm on average.
July is the warmest month, with average highs of 23 °C. January is the coldest, with average lows of 0 °C.
This week’s forecast highs average 11 °C, 3 °C below the October normal (14 °C).
Monthly averages, 1991–2020
Month
Avg high
Avg low
Rain
Jan
4 °C
0 °C
91 mm
Feb
6 °C
1 °C
76 mm
Mar
9 °C
3 °C
79 mm
Apr
14 °C
6 °C
60 mm
May
17 °C
9 °C
72 mm
Jun
21 °C
12 °C
80 mm
Jul
23 °C
15 °C
86 mm
Aug
23 °C
14 °C
88 mm
Sep
19 °C
11 °C
76 mm
Oct
14 °C
8 °C
83 mm
Nov
9 °C
4 °C
86 mm
Dec
5 °C
1 °C
103 mm
Year
14 °C
7 °C
980 mm
Climate normals: ERA5 reanalysis 1991–2020 (Copernicus/ECMWF), computed by SkiesAtlas for 50.78° N, 7.28° E. ERA5 averages over a 0.25° grid (about 25 km): hills, a coastline or the heat of the city itself can shift local values by a degree or two.
Air quality & pollen in Hennef (Sieg)
1/6
Good
European Air Quality Index (EAQI) · CAMS source
PM2.57µg/m³
PM1010µg/m³
O₃29µg/m³
NO₂22µg/m³
SO₂3µg/m³
Pollen
AlderNone
BirchNone
GrassNone
MugwortNone
OliveNone
RagweedNone
CAMS data (Copernicus) · air quality and pollen refreshed several times a day.
Rain in Hennef (Sieg): live radar and next-hour forecast
Will it rain in Hennef (Sieg)? Track precipitation live on the radar and anticipate showers in the next hour — the +1 h extrapolation is based on the real movement of rain cells.
Rain radarObserved, then extrapolation up to +1h (real cell movement) · drag the timeline
Moon calendar for Hennef (Sieg)
Waning gibbous
93 % illuminated · 17.3 days
Rise 03:43 Set 21:55
Thu29/1087%
Fri30/1079%
Sat31/1069%
Sun1/1159%
Mon2/1149%Last quarter
Tue3/1138%
Wed4/1128%
Thu5/1119%
Fri6/1112%
Sat7/116%
Sun8/112%
Mon9/110%
Rise and set in local time (Europe/Berlin) · phases and illumination computed by SkiesAtlas (synodic model).
Weather history for Hennef (Sieg)
What was the weather in Hennef (Sieg) on a past date? Pick a day — ERA5 reanalysis data (ECMWF / Copernicus C3S), available up to one week ago.
The weather in Hennef (Sieg)
Find the full weather for Hennef (Sieg), North Rhine-Westphalia: current conditions, forecast by time of day (morning, afternoon, evening) and a 7-day trend. Right now the sky is “partly cloudy” with 8 °C (feels like 8 °C) and wind at 3 km/h.
Today, temperatures range from 8 °C to 13 °C, with no significant precipitation. Forecast computed by our multi-model engine SkiesAtlas (ECMWF-AIFS, NOAA GFS, DWD ICON): cloud cover calibrated on METAR observations, convective energy (CAPE) for storms.
