Siegen, Germany experiences average highs of 14°C (57°F) and lows of 7°C (45°F) throughout the year. Rainfall is frequent, averaging about 14 rainy days per month. Average highs have warmed by 1.1°C (2.0°F) across the available records.
Siegen, Germany Weather & Climate 2026
Monthly climate averages for Siegen, Germany. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Apr–Sep 
Wetter season: Jan–Dec At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
4.9/10
Best: May, June, July, August, September
UV Index
4
Low
Temperature 14°C / 7°C
Feels Like 12°C / 4°C
Rainy Days 14
Rainfall 85 mm
Sunshine 7 h
Humidity 82%
Wind Speed 16 km/h
Dew Point 7°C
Snow Days 6 days
Frost Days 10 days
Hottest Month
23°C
August
Avg Low15°C
Rain13days
Coldest Month
-1°C
January
Avg High4°C
Rain17days
Driest Month
11days
September
Avg High19°C
Avg Low11°C
Windiest Month
19 km/h
February (Gusts 43)
Worst Time to Visit
Consider avoiding January, February, November, December due to very cold temperatures, heavy rainfall.
Sun Position
Sunrise 05:15
Daylight 16.5h
Sunset 21:44
Live conditions—
Siegen on the map · live conditions
Siegen, Germany
- Continent
- Europe
- Country
- Germany
- City
- Siegen
- Population
- 107.2K
- Coordinates
- 50.87°, 8.02°
Seasonal Breakdown
Spring
Mar–May
Avg High 13°C
Avg Low 5°C
Rain 13 days/mo
1/3 best months
Summer
Jun–Aug
Avg High 22°C
Avg Low 14°C
Rain 13 days/mo
3/3 best months
Autumn
Sep–Nov
Avg High 14°C
Avg Low 8°C
Rain 13 days/mo
1/3 best months
Winter
Dec–Feb
Avg High 5°C
Avg Low 0°C
Rain 15 days/mo
Climate Charts
Based on historical averages (2016–2025)
Monthly Temperatures
HighLowShaded bands show the typical range across the available yearly records.
Line chart showing monthly temperatures. Jan: 4°C / -1°C . Feb: 6°C / 0°C . Mar: 9°C / 2°C . Apr: 13°C / 4°C . May: 18°C / 9°C . Jun: 22°C / 13°C . Jul: 22°C / 14°C . Aug: 23°C / 15°C . Sep: 19°C / 11°C . Oct: 14°C / 8°C . Nov: 8°C / 3°C . Dec: 5°C / 1°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 124 mm. Feb: 93 mm. Mar: 84 mm. Apr: 64 mm. May: 81 mm. Jun: 82 mm. Jul: 79 mm. Aug: 70 mm. Sep: 77 mm. Oct: 88 mm. Nov: 77 mm. Dec: 106 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 91%. Feb: 86%. Mar: 80%. Apr: 75%. May: 74%. Jun: 74%. Jul: 73%. Aug: 75%. Sep: 79%. Oct: 87%. Nov: 91%. Dec: 93%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 19 km/h . Feb: 19 km/h . Mar: 18 km/h . Apr: 17 km/h . May: 16 km/h . Jun: 15 km/h . Jul: 15 km/h . Aug: 14 km/h . Sep: 15 km/h . Oct: 17 km/h . Nov: 16 km/h . Dec: 18 km/h .
Sunshine
Sunshine
Sunshine: Jan: 3h. Feb: 5h. Mar: 7h. Apr: 10h. May: 11h. Jun: 12h. Jul: 11h. Aug: 11h. Sep: 9h. Oct: 5h. Nov: 4h. Dec: 2h.
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 1. Feb: UV 2. Mar: UV 3. Apr: UV 4. May: UV 6. Jun: UV 6. Jul: UV 6. Aug: UV 6. Sep: UV 4. Oct: UV 2. Nov: UV 1. Dec: UV 1.
Monthly Daylight Hours
Daylight12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy Oppressive
Snow Days
Snow DaysSnowfall
Snow Days: Jan: 11 days. Feb: 6 days. Mar: 4 days. Apr: 2 days. May: 0 days. Jun: 0 days. Jul: 0 days. Aug: 0 days. Sep: 0 days. Oct: 0 days. Nov: 4 days. Dec: 7 days.
Climate Trends
Average highs have warmed by 1.1°C (2.0°F) across the available records. Average rainfall has remained broadly steady.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Aug 2025 · 23°C | Aug · 23°C |
| Coldest month | Jan 2025 · -1°C | Jan · -1°C |
| Wettest month | Jan 2025 · 165 mm | Jan · 124 mm |
| Windiest month | Jan 2025 · 18 km/h | Feb · 19 km/h |
Month-by-Month Weather Table
January
Poor 
February
Poor March
Poor April
Fair May best
Good June best
Excellent July best
Excellent August best
Excellent September best
Good October
Fair November
Poor December
Poor | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 4°C / -1°C | 0°C / -5°C | 17days (124 mm) Wet | 2.8h Poor | 91% Very Muggy | 1 Low | Poor | View Details |
| February | 6°C / 0°C | 2°C / -4°C | 14days (93 mm) Wet | 4.9h Fair | 86% Very Muggy | 1.6 Low | Poor | View Details |
| March | 9°C / 2°C | 6°C / -2°C | 14days (84 mm) Wet | 7h Good | 80% Humid | 3.4 Moderate | Poor | View Details |
| April | 13°C / 4°C | 11°C / 1°C | 12days (64 mm) Wet | 9.6h Good | 75% Muggy | 4.3 Moderate | Fair | View Details |
| May best | 18°C / 9°C | 16°C / 7°C | 12days (81 mm) Wet | 10.8h Excellent | 74% Muggy | 5.7 High | Good | View Details |
| June best | 22°C / 13°C | 22°C / 12°C | 12days (82 mm) Wet | 11.6h Excellent | 74% Muggy | 6.3 High | Excellent | View Details |
| July best | 22°C / 14°C | 22°C / 14°C | 13days (79 mm) Wet | 11.3h Excellent | 73% Muggy | 5.9 High | Excellent | View Details |
| August best | 23°C / 15°C | 23°C / 14°C | 13days (70 mm) Wet | 10.5h Excellent | 75% Muggy | 5.5 High | Excellent | View Details |
| September best | 19°C / 11°C | 18°C / 10°C | 11days (77 mm) Wet | 8.5h Good | 79% Humid | 4.1 Moderate | Good | View Details |
| October | 14°C / 8°C | 12°C / 6°C | 14days (88 mm) Wet | 5.1h Fair | 87% Very Muggy | 2.3 Moderate | Fair | View Details |
| November | 8°C / 3°C | 5°C / 0°C | 15days (77 mm) Wet | 3.5h Poor | 91% Very Muggy | 1.2 Low | Poor | View Details |
| December | 5°C / 1°C | 2°C / -2°C | 15days (106 mm) Wet | 2.1h Poor | 93% Very Muggy | 0.8 Low | Poor | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Siegen are May, June, July, August, September, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Siegen, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Siegen is August, with average daytime highs of 23°C (73°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Siegen is January, with average overnight lows of -1°C (31°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Siegen is January, averaging 124mm of precipitation across 17 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Siegen runs through January, November, December, February, with the heaviest rainfall in January. Based on 10-year averages for Siegen.
Siegen receives approximately 88 sunshine hours per year. The sunniest month is June with around 12 hours. Based on climate data for Siegen.
The least favorable months to visit Siegen are January, February, November, December, primarily due to very cold temperatures, heavy rainfall. For the best conditions, consider May, June, July, August, September instead.
The annual average UV index in Siegen is 4, classified as moderate. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Siegen is 82%, classified as humid. High humidity makes warm temperatures feel significantly hotter — lightweight, breathable clothing is recommended.
Yes, Siegen receives snow. Months with snowfall average 6 snow days and 10 cm (4 in) of accumulation, with about 10 frost days during winter.
Average wind speeds in Siegen are 16 km/h (10 mph). The windiest month is February with peak winds reaching 19 km/h (12 mph) (gusts up to 43 km/h / 27 mph).
Siegen averages 3 clear-sky days per month with overall cloud cover around 69%. The clearest skies occur in March.
The annual average dew point in Siegen is 7°C (45°F), which feels dry and comfortable. Outdoor activities are comfortable year-round from a humidity standpoint.
Siegen has a Oceanic climate, classified as Cfb under the Köppen system. Temperate climates have mild winters and warm summers, with rainfall spread across the year and four distinct seasons.
The 'feels like' temperature in Siegen ranges from 4°C (39°F) to 12°C (54°F) on average. Wind chill makes winters feel noticeably colder than the actual temperature — layered clothing is recommended.
Yes, June is a great time to visit Siegen. It earns a climate score of 7.9/10 with Excellent.
For June in Siegen, pack Umbrella, Waterproof jacket, Sunscreen (SPF 30+), Sunglasses, Comfortable walking shoes. With average highs of 22°C (71°F) and 12 rainy days, these essentials will keep you comfortable.
Data Source
Climate data derived from ERA5 reanalysis (ECMWF), averaged over 2016–2025. Sea surface temperature from marine reanalysis data. Climate scores and seasonal estimates are computed by WorldStats.
Last updated: