Best time to visit Siegen
Month-by-month weather averages for Siegen.
Siegen, North Rhine-Westphalia, Germany
°C
mm
- Average daily high and low
- Precipitation
- Good month
- Best month
- Made good or best by an event
| Month | Average daily high | Average daily low | Precipitation | Verdict |
|---|---|---|---|---|
| January | 2.2 °C / 36 °F | -1.8 °C / 29 °F | 118 mm / 4.6 in | neither best nor good |
| February | 3.6 °C / 38 °F | -1.2 °C / 30 °F | 90 mm / 3.5 in | neither best nor good |
| March | 7.6 °C / 46 °F | 0.8 °C / 33 °F | 88 mm / 3.5 in | neither best nor good |
| April | 12.5 °C / 55 °F | 4 °C / 39 °F | 69 mm / 2.7 in | neither best nor good |
| May | 16.2 °C / 61 °F | 7.5 °C / 46 °F | 97 mm / 3.8 in | good month |
| June | 19.8 °C / 68 °F | 11.1 °C / 52 °F | 100 mm / 3.9 in | good month |
| July | 21.3 °C / 70 °F | 12.6 °C / 55 °F | 109 mm / 4.3 in | good month |
| August | 20.8 °C / 69 °F | 12.3 °C / 54 °F | 109 mm / 4.3 in | good month |
| September | 17.1 °C / 63 °F | 9.4 °C / 49 °F | 83 mm / 3.3 in | good month |
| October | 12.1 °C / 54 °F | 6.4 °C / 44 °F | 88 mm / 3.5 in | neither best nor good |
| November | 6.8 °C / 44 °F | 2.8 °C / 37 °F | 92 mm / 3.6 in | neither best nor good |
| December | 3.6 °C / 38 °F | 0.1 °C / 32 °F | 112 mm / 4.4 in | neither best nor good |
Good and best months depend on more than temperature, rain and events. How they are chosen
Each activity on this page has its own good and best months, rated on twenty years of daily weather records. Which measures count, and how much, depends on the activity: humidity for exploring outdoors, wind for the beach, hiking and skiing, snow for skiing alone. Between them, the activities are rated on:
- Daytime highs
- Night-time lows
- How warm it feels
- Humidity
- How much of the day is sunny
- Hours of daylight
- Monthly rainfall
- How many days it rains
- Days of heavy rain
- Wind
- Snowfall and days with snow
- Major events, such as festivals
The chart shows the good and best months for exploring outdoors.
The event icon marks a month that an event lifts to good or best, such as a festival or a natural spectacle. Choose “Weather only” in the toolbar to rate the months on weather alone.
Best months by activity
Exploring outdoors
Mild days and nights, mostly dry and bright. The default for 'when should I go'.
- JJanuary: neither
- FFebruary: neither
- MMarch: neither
- AApril: neither
- MMay: good
- JJune: good
- JJuly: good
- AAugust: good
- SSeptember: good
- OOctober: neither
- NNovember: neither
- DDecember: neither
- Good
- May–September
Why these months
May · good
In its favour: share of daylight that is sunny 69%, feels like (high) 14.2 °C / 58 °F, average daily high 16.2 °C / 61 °F, precipitation 97 mm / 3.8 in, days with heavy rain 3 days, average daily low 7.5 °C / 46 °F, relative humidity 74%.
Against: wet days 14.6 days.
June · good
In its favour: feels like (high) 19 °C / 66 °F, average daily high 19.8 °C / 68 °F, share of daylight that is sunny 70%, precipitation 100 mm / 3.9 in, average daily low 11.1 °C / 52 °F, days with heavy rain 3.4 days, relative humidity 76%.
Against: wet days 14.2 days.
July · good
In its favour: feels like (high) 20.8 °C / 69 °F, average daily high 21.3 °C / 70 °F, share of daylight that is sunny 71%, precipitation 109 mm / 4.3 in, average daily low 12.6 °C / 55 °F, days with heavy rain 3.8 days, relative humidity 76%.
Against: wet days 15.2 days.
August · good
In its favour: feels like (high) 20.3 °C / 69 °F, average daily high 20.8 °C / 69 °F, share of daylight that is sunny 72%, precipitation 109 mm / 4.3 in, average daily low 12.3 °C / 54 °F, days with heavy rain 4 days.
Against: wet days 15.7 days, relative humidity 79%.
September · good
In its favour: feels like (high) 15.7 °C / 60 °F, share of daylight that is sunny 67%, average daily high 17.1 °C / 63 °F, precipitation 83 mm / 3.3 in, days with heavy rain 2.6 days, average daily low 9.4 °C / 49 °F, wet days 11.7 days.
Against: relative humidity 83%.
Hiking and trekking
Cool enough to climb in, dry enough to enjoy, long enough days.
- JJanuary: neither
- FFebruary: neither
- MMarch: neither
- AApril: best
- MMay: best
- JJune: best
- JJuly: good
- AAugust: good
- SSeptember: best
- OOctober: best
- NNovember: neither
- DDecember: neither
- Best
- April–June, September–October
- Good
- July–August
Why these months
April · best
In its favour: average daily high 12.5 °C / 55 °F, precipitation 69 mm / 2.7 in, days with heavy rain 1.1 days, average daily low 4 °C / 39 °F, share of daylight that is sunny 72%, daylight per day 13.8 h, feels like (high) 9.5 °C / 49 °F, wet days 12.1 days, wind (daily max) 17 km/h / 10 mph.
May · best
In its favour: average daily high 16.2 °C / 61 °F, precipitation 97 mm / 3.8 in, feels like (high) 14.2 °C / 58 °F, average daily low 7.5 °C / 46 °F, share of daylight that is sunny 69%, daylight per day 15.5 h, days with heavy rain 3 days, wind (daily max) 16 km/h / 10 mph.
Against: wet days 14.6 days.
June · best
In its favour: average daily high 19.8 °C / 68 °F, precipitation 100 mm / 3.9 in, feels like (high) 19 °C / 66 °F, average daily low 11.1 °C / 52 °F, share of daylight that is sunny 70%, daylight per day 16.4 h, days with heavy rain 3.4 days, wind (daily max) 16 km/h / 10 mph.
Against: wet days 14.2 days.
July · good
In its favour: average daily high 21.3 °C / 70 °F, precipitation 109 mm / 4.3 in, feels like (high) 20.8 °C / 69 °F, average daily low 12.6 °C / 55 °F, share of daylight that is sunny 71%, daylight per day 16 h, days with heavy rain 3.8 days, wind (daily max) 16 km/h / 10 mph.
Against: wet days 15.2 days.
August · good
In its favour: average daily high 20.8 °C / 69 °F, precipitation 109 mm / 4.3 in, feels like (high) 20.3 °C / 69 °F, average daily low 12.3 °C / 54 °F, share of daylight that is sunny 72%, daylight per day 14.5 h, days with heavy rain 4 days, wind (daily max) 15 km/h / 10 mph.
Against: wet days 15.7 days.
September · best
In its favour: average daily high 17.1 °C / 63 °F, precipitation 83 mm / 3.3 in, feels like (high) 15.7 °C / 60 °F, average daily low 9.4 °C / 49 °F, share of daylight that is sunny 67%, daylight per day 12.6 h, days with heavy rain 2.6 days, wet days 11.7 days, wind (daily max) 16 km/h / 10 mph.
October · best
In its favour: average daily high 12.1 °C / 54 °F, precipitation 88 mm / 3.5 in, average daily low 6.4 °C / 44 °F, share of daylight that is sunny 51%, days with heavy rain 2.6 days, feels like (high) 9.8 °C / 50 °F, daylight per day 10.7 h, wind (daily max) 18 km/h / 11 mph.
Against: wet days 13.7 days.
An activity is listed only where it applies: skiing at ski destinations, beach and swimming at beach destinations. The nearest ski area is Kreuzberg, 150 km away.
Weather averages
Monthly averages over twenty years, 2006–2025. Highs, lows and precipitation are in the chart at the top.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feels like (high) | -1.9 °C | -0.4 °C | 3.8 °C | 9.5 °C | 14.2 °C | 19 °C | 20.8 °C | 20.3 °C | 15.7 °C | 9.8 °C | 3.6 °C | -0.2 °C |
| Days with heavy rain | 3.9 days | 2.6 days | 2.8 days | 1.1 days | 3 days | 3.4 days | 3.8 days | 4 days | 2.6 days | 2.6 days | 2.2 days | 3.4 days |
| Time rain usually falls | 9 pm | 2 pm | 5 pm | 4 pm | 5 pm | 4 pm | 4 pm | 4 pm | 4 pm | 4 pm | 9 pm | 12 pm |
| Sunshine per day | 3.1 h | 5 h | 7.3 h | 10 h | 10.8 h | 11.5 h | 11.4 h | 10.4 h | 8.4 h | 5.5 h | 3.7 h | 2.4 h |
| Relative humidity | 92% | 88% | 79% | 73% | 74% | 76% | 76% | 79% | 83% | 89% | 92% | 93% |
Air quality
Averaged over a shorter period (2022–2025) than the twenty-year averages above, and not counted towards good or best months.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Air pollution (PM2.5) 2022–2025 | 6.4 µg/m³ | 9.6 µg/m³ | 11.1 µg/m³ | 9.7 µg/m³ | 10.6 µg/m³ | 13.1 µg/m³ | 11.5 µg/m³ | 10.9 µg/m³ | 9 µg/m³ | 8.5 µg/m³ | 8.4 µg/m³ | 7.2 µg/m³ |
| Air pollution (PM2.5, daily peak) 2022–2025 | 10.9 µg/m³ | 15.4 µg/m³ | 17.9 µg/m³ | 15.8 µg/m³ | 16.3 µg/m³ | 20.5 µg/m³ | 18 µg/m³ | 16.6 µg/m³ | 13.9 µg/m³ | 13.2 µg/m³ | 13.4 µg/m³ | 12 µg/m³ |
- Good 15 µg/m³ or less
- Fair 15 to 25 µg/m³
- Moderate 25 to 37.5 µg/m³
- Poor 37.5 to 50 µg/m³
- Very poor 50 to 75 µg/m³
- Extremely poor over 75 µg/m³
Each figure is compared with the World Health Organization's guideline for a day's air, 15 µg/m³ or less, and with its interim targets above that. The words are ours: the WHO does not name its steps. The figures are modelled monthly averages, so single days can be well above them. The daily peak is the average of each day's highest hour, shaded on the same scale.