Home·Germany·North Rhine-Westphalia

Germany · 1991–2020

Best time to visit
Bonn.

August leads for comfortable weather in Bonn: typically 24°C by day, 13.5°C at night, with 80 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortAugust

Typical high24°C

Typical low13.5°C

Rain in August80 mm

Comfort

August

August · July · June

84climate match

Beach

August

August · July · June

49climate match

Outdoors

September

September · May · June

87climate match

The weakest month is January, scoring 5 against August’s 84 — days reach only 5.4°C, 19° below the 24°C the score treats as ideal.

Month by month

The whole year,
without the guesswork.

The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.

Jan

55.4° / 0.2°

Feb

76.5° / 0.4°

Mar

2410.7° / 2.3°

Apr

4815.6° / 5.1°

May

6119.2° / 8.6°

Jun

7522.5° / 11.8°

Jul

8324.2° / 13.7°

Aug

8424° / 13.5°

Sep

6920° / 10.2°

Oct

4615.1° / 7.3°

Nov

239.8° / 4.1°

Dec

66.4° / 1.4°

Monthly climate evidence for Bonn — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	5.4°C	0.2°C	56 mm	11.2	8 h 25	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 28	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 59	6	Good coverage

Records at BONN-ROLEBER, 2000–2026
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

Typical days per month at BONN-ROLEBER, 1991–2020
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

How often, not how much — every day in BONN-ROLEBER’s record sorted by what it was actually like, rather than averaged
Month	Warm & dry days	Wet days	Washouts	Week with 3+ wet days	Daytime mean has ranged
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 warm and dry day reaches 20°C with under 1 mm of rain; a wet day gets 1 mm or more; a washout gets 10 mm or more. The week column is the share of seven-day stretches in that month, across the station’s whole daily record, that contained three or more wet days — the odds a week-long trip is rained on repeatedly, counted rather than modelled. The last column is the 10th to 90th percentile of that month’s daytime average across individual years: a narrow band means the average is what you will get, a wide one means the average is a midpoint between years that felt quite different.

2002Each stripe is one year’s mean temperature against the 23-year average. Warmest: 2024. Coolest: 2010.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 2946447
NOAA station: GME00130990 · BONN-ROLEBER
Station distance: 6.9 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 20 usable years
Daylight: Calculated from latitude 50.73°, 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.

These places read the same station, so their numbers are identical — distance from BONN-ROLEBER is what differs

Sankt Augustin→Bornheim→Hennef (Sieg)→Königswinter→Siegburg→Bonn Hardtberg→

Or put two places side by side: Bonn vs Sankt Augustin

Best time to visitBonn.

August

August

September

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Bonn.

The whole year,
without the guesswork.

Nearby, measured,
and named.