August
Other strong months: July and June
84/100 weather score
Germany · 1991–2020
Best time to visit
Hennef (Sieg)
For Hennef (Sieg), August has the most comfortable weather in our climate comparison. Typical daytime highs are 24°C, nights average 13.5°C, and rainfall totals about 80 mm. Figures use measured 1991–2020 normals from the nearest eligible NOAA station.
Best all-round monthAugust
Typical daytime high24°C
Typical night-time low13.5°C
August rainfall80 mm
September
Other strong months: May and June
87/100 weather score
Make the answer personal
Choose the weather
that suits you.
Set the daytime temperature and rainfall you are comfortable with. We will show only the months that meet every choice, using the measured 1991–2020 averages below.
5 months fit your choices for Hennef (Sieg)
January has the lowest comfort score at 5 out of 100, compared with August at 84. The main reason is that days reach only 5.4°C, 19° below the 24°C the score treats as ideal.
Quick answers
Planning a trip to Hennef (Sieg)?
These answers come from the same measured monthly climate record shown on this page.
When is the best time to visit Hennef (Sieg)?
August is the strongest all-round choice in our temperature-and-rainfall comparison, with a typical daytime high of 24°C and 80 mm of rain.
What is the hottest month in Hennef (Sieg)?
July is hottest in this record, with a typical daytime high of 24.2°C and a night-time low of 13.7°C.
Which month has the least rain?
April has the lowest monthly rainfall total at 47 mm.
Is this a weather forecast?
No. These are long-term measured averages from 1991–2020. Check a current forecast before you travel.
Month by month
See how the weather
changes through the year.
The bars combine daytime temperature, night-time temperature and rainfall. The figures are measured historical averages, not a forecast for a particular trip.
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | 5.4°C | 0.2°C | 56 mm | 11.2 | 8 h 24 | 5 | Good coverage |
| February | 6.5°C | 0.4°C | 48 mm | 10.7 | 9 h 56 | 7 | Good coverage |
| March | 10.7°C | 2.3°C | 53 mm | 10.2 | 11 h 42 | 24 | Good coverage |
| April | 15.6°C | 5.1°C | 47 mm | 8.7 | 13 h 44 | 48 | Good coverage |
| May | 19.2°C | 8.6°C | 69 mm | 10.2 | 15 h 29 | 61 | Good coverage |
| June | 22.5°C | 11.8°C | 85 mm | 10.6 | 16 h 28 | 75 | Good coverage |
| July | 24.2°C | 13.7°C | 83 mm | 11 | 16 h 04 | 83 | Good coverage |
| August | 24°C | 13.5°C | 80 mm | 10.3 | 14 h 32 | 84 | Good coverage |
| September | 20°C | 10.2°C | 63 mm | 9.3 | 12 h 33 | 69 | Good coverage |
| October | 15.1°C | 7.3°C | 64 mm | 10.2 | 10 h 36 | 46 | Good coverage |
| November | 9.8°C | 4.1°C | 59 mm | 10.7 | 8 h 52 | 23 | Good coverage |
| December | 6.4°C | 1.4°C | 60 mm | 11.7 | 7 h 58 | 6 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 15.6°C2 Jan 2023 | -16.4°C6 Jan 2009 | 33 mm28 Jan 2021 | 116 mm2004 · driest 15 mm in 2006 | 26 |
| February | 20.7°C27 Feb 2019 | -15.4°C7 Feb 2012 | 29 mm11 Feb 2011 | 122 mm2002 · driest 16 mm in 2018 | 26 |
| March | 25.2°C31 Mar 2021 | -11.9°C13 Mar 2013 | 30 mm5 Mar 2009 | 102 mm2009 · driest 8 mm in 2025 | 26 |
| April | 28.3°C28 Apr 2007 | -5.0°C8 Apr 2003 | 36 mm16 Apr 2009 | 116 mm2005 · driest 0 mm in 2007 | 26 |
| May | 32.9°C29 May 2017 | -1.5°C12 May 2020 | 41 mm7 May 2004 | 158 mm2024 · driest 12 mm in 2020 | 26 |
| June | 38.2°C27 Jun 2026 | 4.2°C8 Jun 2005 | 68 mm5 Jun 2011 | 201 mm2011 · driest 33 mm in 2019 | 26 |
| July | 40.9°C25 Jul 2019 | 6.6°C10 Jul 2015 | 71 mm14 Jul 2021 | 235 mm2014 · driest 12 mm in 2005 | 26 |
| August | 37.4°C12 Aug 2003 | 5.0°C30 Aug 2007 | 57 mm21 Aug 2007 | 185 mm2007 · driest 0 mm in 2003 | 25 |
| September | 33.0°C15 Sep 2020 | 1.3°C29 Sep 2018 | 37 mm23 Sep 2018 | 134 mm2001 · driest 18 mm in 2021 | 26 |
| October | 26.7°C2 Oct 2023 | -5.7°C24 Oct 2003 | 32 mm29 Oct 2007 | 110 mm2003 · driest 20 mm in 2018 | 26 |
| November | 20.5°C2 Nov 2020 | -7.1°C28 Nov 2010 | 39 mm18 Nov 2004 | 119 mm2001 · driest 2 mm in 2011 | 26 |
| December | 17.4°C31 Dec 2022 | -15.5°C20 Dec 2009 | 22 mm22 Dec 2012 | 105 mm2012 · driest 3 mm in 2002 | 25 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) |
|---|---|---|---|---|
| January | 0 | 0 | 14 | <1 |
| February | 0 | 0 | 13 | 1 |
| March | 0 | 0 | 9 | 1 |
| April | 1 | 0 | 3 | 1 |
| May | 4 | <1 | <1 | 2 |
| June | 9 | 2 | 0 | 3 |
| July | 13 | 3 | 0 | 3 |
| August | 11 | 3 | 0 | 3 |
| September | 4 | <1 | 0 | 2 |
| October | <1 | 0 | 1 | 2 |
| November | 0 | 0 | 4 | 2 |
| December | 0 | 0 | 11 | <1 |
| Month | Dry days reaching 20°C | Wet days | Days with heavy rain | Weeks with 3+ wet days | Typical high by year |
|---|---|---|---|---|---|
| January | 0% | 36% | 3% | 47% | 2.6–8.0°C |
| February | <1% | 37% | 3% | 48% | 3.2–9.7°C |
| March | 3% | 32% | 4% | 41% | 8.7–13.7°C |
| April | 17% | 29% | 4% | 36% | 13.0–18.8°C |
| May | 35% | 32% | 7% | 45% | 16.7–21.2°C |
| June | 52% | 35% | 8% | 47% | 20.8–25.4°C |
| July | 55% | 35% | 9% | 45% | 21.9–26.7°C |
| August | 60% | 33% | 8% | 46% | 21.6–26.7°C |
| September | 40% | 32% | 6% | 42% | 17.9–22.7°C |
| October | 10% | 33% | 5% | 40% | 13.4–17.7°C |
| November | <1% | 37% | 5% | 51% | 8.3–11.8°C |
| December | 0% | 37% | 4% | 51% | 4.5–8.1°C |
A dry day reaching 20°C records under 1 mm of rain. A wet day records at least 1 mm, while a heavy-rain day records at least 10 mm. The weekly figure is the share of seven-day periods containing three or more wet days. The final column shows the middle 80% of average daytime highs recorded for that month in individual years; a wider range means conditions have varied more from one year to another.
The evidence behind this page
Where these figures
come from.
- Place identity
- GeoNames 2906376
- NOAA station
- GME00130990 · BONN-ROLEBER
- Station distance
- 7.6 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 20 usable years
- Daylight
- Calculated from latitude 50.78°, mid-month, sunrise to sunset including refraction. Not a station measurement.
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.
Next step
Choose your month.
Then plan the details.
The weather comparison for Hennef (Sieg) is based on climate evidence, not payments from travel companies. Flight, accommodation and activity links will be clearly labelled when they are added; there are no booking offers on this page today.
How travel partnerships will work