Best time to visit Bonn
Re-score for me — drag the dial — every chart on the page recolours live for your heat limit 27°C
Default 27 °C is the upper edge of the Holiday Climate Index "ideal comfort" band (Scott, Rutty, Amelung & Tang, 2016). Above this, most warm-tourism travellers report measurable discomfort.
How is this scored? HCI / Steadman / CCI gate — full methodology and citations below.
Compare with another destination
Add as many as you like — stacked below the main strips above. Each row is just the recent-window score strip and (for beach destinations) sea-temperature strip.
Tours in Bonn
6 top-rated tours via Viator. Booking links earn this site a commission at no cost to you. Map locations are approximate (centred on Bonn).
- 1
Private city tour Bonn - City Highlights - 2
Bonn Private Walking Tour With A Professional Guide - 3
Explore Bonn with Beethoven, Lunch and Haribo Walking Tour 2,0hr - 4
Bonn Christmas Market Tour With A Professional Guide - 5
Bonn Government District : Audio Tour with Real Guide | App Guided Tour - 6
Bonn Scavenger Hunt and Sights Self-Guided Tour
Last refreshed 2026-06-20.
Similar climatesCologne98% · Maastricht98% · Eindhoven97%
Other destinations with the most-alike year-round climate to Bonn (apparent temperature, rain hours, sunshine — matched within the same trip-profile). The ±N chip compares each match's typical score for the current month against Bonn's. Based on the 2020-2024 climatology, not this year's actual weather.
Month-by-month
| Month | Temp °C | Feels °C | Rain days | Rain h | Rain h/day | Humidity | Wind km/h | Sun h | UV | Interest | Score |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jan | 1–6 | 3 | 15 | 191 | 12.7 | 80% | 20 | 82 | 1 | Quiet | 3 |
| Feb | 3–10 | 6 | 15 | 172 | 11.5 | 72% | 23 | 109 | 1 | Quiet | 4 |
| Mar | 3–12 | 9 | 14 | 165 | 11.8 | 65% | 18 | 171 | 2 | Quiet | 5 |
| Apr | 5–14 | 11 | 12 | 146 | 12.2 | 60% | 18 | 203 | 3 | Quiet | 6 |
| May | 9–19 | 17 | 13 | 148 | 11.4 | 58% | 17 | 254 | 4 | Quiet | 7 |
| Jun | 14–24 | 23 | 12 | 118 | 9.8 | 55% | 16 | 256 | 5 | Quiet | 8 |
| Jul | 15–24 | 23 | 13 | 154 | 11.8 | 56% | 17 | 252 | 5 | Quiet | 8 |
| Aug | 16–25 | 25 | 11 | 135 | 12.3 | 57% | 16 | 244 | 5 | Peak | 8 |
| Sep | 12–22 | 21 | 11 | 111 | 10.1 | 62% | 15 | 208 | 3 | Busy | 8 |
| Oct | 9–17 | 15 | 15 | 144 | 9.6 | 72% | 18 | 142 | 2 | Moderate | 6 |
| Nov | 5–10 | 8 | 13 | 157 | 12.1 | 78% | 18 | 99 | 1 | Peak | 4 |
| Dec | 3–7 | 4 | 16 | 191 | 11.9 | 82% | 19 | 60 | — | Moderate | 3 |
UV Index in Bonn by Month
UV index in Bonn peaks at 5 (moderate) in June, dropping to 0 (low) in December.
Best months in detail
June
8/1014–24°C · 12 rain days (118h) · 256 sun hours · 55% humidity · Quiet crowd · UV 5 (moderate) · sunniest 1 in 10 days reach 7 (high)
September
8/1012–22°C · 11 rain days (111h) · 208 sun hours · 62% humidity · Busy crowd · UV 3 (moderate) · sunniest 1 in 10 days reach 5 (moderate)
August
8/1016–25°C · 11 rain days (135h) · 244 sun hours · 57% humidity · Peak crowd · UV 5 (moderate) · sunniest 1 in 10 days reach 6 (high)
Every month
Show the other 9 months in detail
January
3/101–6°C (feels 3°C) · 15 rain days (191h) · 82 sun hours · 80% humidity · Quiet crowd · UV 1 (low)
February
4/103–10°C (feels 6°C) · 15 rain days (172h) · 109 sun hours · 72% humidity · Quiet crowd · UV 1 (low)
March
5/103–12°C (feels 9°C) · 14 rain days (165h) · 171 sun hours · 65% humidity · Quiet crowd · UV 2 (low) · sunniest 1 in 10 days reach 3 (moderate)
April
6/105–14°C (feels 11°C) · 12 rain days (146h) · 203 sun hours · 60% humidity · Quiet crowd · UV 3 (moderate) · sunniest 1 in 10 days reach 5 (moderate)
May
7/109–19°C (feels 17°C) · 13 rain days (148h) · 254 sun hours · 58% humidity · Quiet crowd · UV 4 (moderate) · sunniest 1 in 10 days reach 6 (moderate)
July
8/1015–24°C · 13 rain days (154h) · 252 sun hours · 56% humidity · Quiet crowd · UV 5 (moderate) · sunniest 1 in 10 days reach 7 (high)
October
6/109–17°C (feels 15°C) · 15 rain days (144h) · 142 sun hours · 72% humidity · Moderate crowd · UV 2 (low)
November
4/105–10°C (feels 8°C) · 13 rain days (157h) · 99 sun hours · 78% humidity · Peak crowd · UV 1 (low)
December
3/103–7°C (feels 4°C) · 16 rain days (191h) · 60 sun hours · 82% humidity · Moderate crowd
Frequently asked questions about visiting Bonn
When is the best time to visit Bonn?
June is the highest-scoring month (8/10 on the Holiday Climate Index). Typical conditions: 14–24°C (12 rainy days). The top three months by score are June, September, August.
What is the worst time to visit Bonn?
December is the lowest-scoring month (3/10). Typical conditions: 3–7°C (16 rainy days).
When are crowds lowest in Bonn?
Search-interest seasonality (Google Trends 2021-2025) is lowest in February and peaks in August. Interest tracks both in-trip visitors and lead-time planners, so treat it as a "destination is on people's minds" signal rather than literal arrivals.
Which months in Bonn have good weather but fewer tourists?
June (climate 8/10, crowd index 22) and July (climate 8/10, crowd index 25) — shoulder months with above-average climate and below-median search-interest. Often the best value-for-weather trade.
What is the UV index in Bonn by month?
UV peaks at 5 (moderate) in June and is lowest in December at 0 (low). Monthly peak values: Jan 1, Feb 1, Mar 2, Apr 3, May 4, Jun 5, Jul 5, Aug 5, Sep 3, Oct 2, Nov 1, Dec —.
What is the UV index in Bonn in June?
June is the peak UV month in Bonn, with a daily-peak UV index of 5 (moderate). Standard sun protection — sunglasses and light SPF — is recommended.
How high can UV get in Bonn on the sunniest days?
Most days look like the monthly average, but on the sunniest ~1 in 10 days UV climbs higher than the mean suggests. June is the worst case: typical days average UV 5 (moderate), but the top 10% of days reach UV 7 (high) — and even higher. Months where the sunniest days routinely exceed the typical reading: March, April, May, June, July, August, September. Plan sun protection for the worst case, not the average.
Is air quality in Bonn bad for travelers?
PM2.5 (fine-particle pollution) exceeds the WHO sensitive-group guideline (15 µg/m³) in 6 months: January, February, March, April, November, December. The worst month is March with a typical-day mean of 13 µg/m³ (moderate); on the worst 10% of days PM2.5 reaches 24 µg/m³ (unhealthy for sensitive) and higher. People with asthma, heart conditions, or sensitive children may want to avoid these months or limit outdoor activity. Source: CAMS via Open-Meteo.