September weather forecastHeilbronn, Germany
September
Weather in September
September, the first month of the autumn in Heilbronn, is also an enjoyable month, with an average temperature ranging between max 19.7°C (67.5°F) and min 10°C (50°F).Temperature
The shift from August to September includes a small decrease in the average high-temperature, from a moderately hot 24.5°C (76.1°F) to an enjoyable 19.7°C (67.5°F). An average nighttime temperature of 10°C (50°F) is witnessed throughout September.Humidity
In Heilbronn, the average relative humidity in September is 77%.Rainfall
In Heilbronn, in September, during 12.5 rainfall days, 33mm (1.3") of precipitation is typically accumulated. Throughout the year, there are 175.1 rainfall days, and 581mm (22.87") of precipitation is accumulated.Snowfall
In Heilbronn, snow does not fall in May through September.Daylight
In September, the average length of the day is 12h and 35min.On the first day of the month, sunrise is at 06:40 and sunset at 20:05. On the last day of September, in Heilbronn, sunrise is at 07:22 and sunset at 19:03 CEST.
Sunshine
In September, the average sunshine is 8.7h.UV index
The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for average individuals.Note: The maximum daily UV index of 4 in September converts into the following recommendations:
Prioritize safety - Recommendations to avert sunburn are shared. To protect against the Sun's most potent rays, avoid direct exposure around midday. Stay sun-safe with clothing that is both closely woven and worn loosely.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Heilbronn, Germany
- Average high temperature in September: 19.7°C
The warmest month (with the highest average high temperature) is August (24.5°C).
The month with the lowest average high temperature is January (3.1°C).
- Average low temperature in September: 10°C
The month with the highest average low temperature is August (14°C).
The coldest month (with the lowest average low temperature) is January (-1.3°C).
Average pressure in September
Heilbronn, Germany
- Average pressure in September: 1018.5mbar
The month with the highest atmospheric pressure is December (1019.5mbar).
The month with the lowest atmospheric pressure is November (1015.2mbar).
Average wind speed in September
Heilbronn, Germany
- Average wind speed in September: 8.5km/h
The windiest month (with the highest average wind speed) is February (12.7km/h).
The calmest month (with the lowest average wind speed) is August (8.4km/h).
Average humidity in September
Heilbronn, Germany
- Average humidity in September: 77%
The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is August (72%).
Average rainfall in September
Heilbronn, Germany
- Average rainfall in September: 33mm
The wettest month (with the highest rainfall) is May (72mm).
The driest month (with the least rainfall) is April (27mm).
Average rainfall days in September
Heilbronn, Germany
- Average rainfall days in September: 12.5 days
The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is February (11.6 days).
Average snowfall in September
Heilbronn, Germany
- Average snowfall in September: 0mm
The month with the highest snowfall is January (72mm).
The months with the least snowfall are May, June, July, August and September (0mm).
Average snowfall days in September
Heilbronn, Germany
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (8.5 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Heilbronn, Germany
- Average daylight in September: 12h and 36min
The month with the longest days is June (Average daylight: 16h and 12min).
The month with the shortest days is December (Average daylight: 8h and 18min).
- Average sunshine in September: 8h and 42min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days in September
Heilbronn, Germany
- Average sunshine days in September: 14.5 days
The month with the most sunshine days is October (15.2 days).
The month with the least sunshine days is June (9.9 days).
Average UV index in September
Heilbronn, Germany
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Heilbronn, Germany
- Average cloud cover in September: 36
The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in September
Heilbronn, Germany
- Average visibility in September: 9km
The months with the highest visibility are March, April, May, June, July, August and September (9km).
The months with the lowest visibility are January, February, October, November and December (8km).
