Best time to visit Heidelberg
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 Heidelberg
6 top-rated tours via Viator. Booking links earn this site a commission at no cost to you. Map locations are approximate (centred on Heidelberg).
- 1
Private boat trip with captain in Heidelberg exclusive and stylish! - 2
Heidelberg Scavenger Hunt and Sights Self-Guided Tour - 3
Heidelberg Exclusive Tour - Old Town, Scenic Walk & Castle Entry - 4
Heidelberg: Guided Tour of Germany’s Dream City - 5
On tour with a friend and his luxury van - 6
Black Forest Day Tour
Last refreshed 2026-06-14.
Similar climatesCologne95% · Strasbourg94% · Luxembourg City94%
Other destinations with the most-alike year-round climate to Heidelberg (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 Heidelberg'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 | 0–6 | 2 | 15 | 191 | 12.7 | 81% | 17 | 84 | 1 | Quiet | 3 |
| Feb | 3–9 | 6 | 15 | 194 | 12.9 | 73% | 19 | 116 | 1 | Quiet | 4 |
| Mar | 3–12 | 9 | 12 | 153 | 12.8 | 63% | 17 | 182 | 2 | Quiet | 5 |
| Apr | 5–15 | 12 | 12 | 149 | 12.4 | 57% | 16 | 219 | 3 | Quiet | 6 |
| May | 10–19 | 18 | 12 | 159 | 13.3 | 57% | 16 | 253 | 5 | Quiet | 7 |
| Jun | 15–24 | 24 | 12 | 129 | 10.8 | 55% | 15 | 269 | 6 | Quiet | 8 |
| Jul | 15–25 | 25 | 11 | 117 | 10.6 | 54% | 15 | 280 | 5 | Quiet | 8 |
| Aug | 16–26 | 26 | 13 | 132 | 10.2 | 57% | 14 | 249 | 5 | Peak | 8 |
| Sep | 12–22 | 21 | 11 | 113 | 10.3 | 62% | 14 | 216 | 4 | Busy | 8 |
| Oct | 9–16 | 15 | 14 | 160 | 11.4 | 74% | 15 | 149 | 2 | Busy | 6 |
| Nov | 4–9 | 7 | 16 | 179 | 11.2 | 81% | 15 | 94 | 1 | Peak | 4 |
| Dec | 2–6 | 3 | 16 | 202 | 12.6 | 85% | 15 | 60 | 1 | Moderate | 3 |
UV Index in Heidelberg by Month
UV index in Heidelberg peaks at 6 (moderate) in June, dropping to 1 (low) in December.
Best months in detail
July
8/1015–25°C · 11 rain days (117h) · 280 sun hours · 54% humidity · Quiet crowd · UV 5 (moderate) · sunniest 1 in 10 days reach 7 (high)
June
8/1015–24°C · 12 rain days (129h) · 269 sun hours · 55% humidity · Quiet crowd · UV 6 (moderate) · sunniest 1 in 10 days reach 8 (high)
September
8/1012–22°C · 11 rain days (113h) · 216 sun hours · 62% humidity · Busy crowd · UV 4 (moderate) · sunniest 1 in 10 days reach 5 (moderate)
Every month
Show the other 9 months in detail
January
3/100–6°C (feels 2°C) · 15 rain days (191h) · 84 sun hours · 81% humidity · Quiet crowd · UV 1 (low)
February
4/103–9°C (feels 6°C) · 15 rain days (194h) · 116 sun hours · 73% humidity · Quiet crowd · UV 1 (low)
March
5/103–12°C (feels 9°C) · 12 rain days (153h) · 182 sun hours · 63% humidity · Quiet crowd · UV 2 (low) · sunniest 1 in 10 days reach 3 (moderate)
April
6/105–15°C (feels 12°C) · 12 rain days (149h) · 219 sun hours · 57% humidity · Quiet crowd · UV 3 (moderate) · sunniest 1 in 10 days reach 5 (moderate)
May
7/1010–19°C (feels 18°C) · 12 rain days (159h) · 253 sun hours · 57% humidity · Quiet crowd · UV 5 (moderate) · sunniest 1 in 10 days reach 6 (high)
August
8/1016–26°C · 13 rain days (132h) · 249 sun hours · 57% humidity · Peak crowd · UV 5 (moderate) · sunniest 1 in 10 days reach 7 (high)
October
6/109–16°C (feels 15°C) · 14 rain days (160h) · 149 sun hours · 74% humidity · Busy crowd · UV 2 (low) · sunniest 1 in 10 days reach 3 (moderate)
November
4/104–9°C (feels 7°C) · 16 rain days (179h) · 94 sun hours · 81% humidity · Peak crowd · UV 1 (low)
December
3/102–6°C (feels 3°C) · 16 rain days (202h) · 60 sun hours · 85% humidity · Moderate crowd · UV 1 (low)
Frequently asked questions about visiting Heidelberg
When is the best time to visit Heidelberg?
July is the highest-scoring month (8/10 on the Holiday Climate Index). Typical conditions: 15–25°C (11 rainy days). The top three months by score are July, June, September.
What is the worst time to visit Heidelberg?
December is the lowest-scoring month (3/10). Typical conditions: 2–6°C (16 rainy days).
When are crowds lowest in Heidelberg?
Search-interest seasonality (Google Trends 2021-2025) is lowest in January and peaks in November. 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 Heidelberg have good weather but fewer tourists?
June (climate 8/10, crowd index 9) and July (climate 8/10, crowd index 22) — shoulder months with above-average climate and below-median search-interest. Often the best value-for-weather trade.
What is the UV index in Heidelberg by month?
UV peaks at 6 (moderate) in June and is lowest in December at 1 (low). Monthly peak values: Jan 1, Feb 1, Mar 2, Apr 3, May 5, Jun 6, Jul 5, Aug 5, Sep 4, Oct 2, Nov 1, Dec 1.
What is the UV index in Heidelberg in June?
June is the peak UV month in Heidelberg, with a daily-peak UV index of 6 (moderate). Standard sun protection — sunglasses and light SPF — is recommended.
How high can UV get in Heidelberg 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 6 (moderate), but the top 10% of days reach UV 8 (high) — and even higher. Months where the sunniest days routinely exceed the typical reading: March, April, May, June, July, August, September, October. Plan sun protection for the worst case, not the average.
Is air quality in Heidelberg bad for travelers?
PM2.5 (fine-particle pollution) exceeds the WHO sensitive-group guideline (15 µg/m³) in 5 months: January, February, March, November, December. The worst month is March with a typical-day mean of 14 µg/m³ (moderate); on the worst 10% of days PM2.5 reaches 23 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.