Weather in Heidelberg

Forecast: MOSMIX (DWD-Statistik über ICON + ECMWF) · Run 21.09. 23:00 Uhr · Station HEIDELBERG (2,0 km from the centre) · own station correction +0,3 °C (from our station comparison). We show where our data comes from – and how often we get it wrong. Measured against official stations, we were recently off by ±1,3 °C here (up to 24 h), rain forecast 90 % correct.
Today: settled weather – historically easy to forecast.
We beat the "same as yesterday" rule of thumb by 56 %.

Now · as of 06:00

8°wolkig

Later today

High · 17:00 Uhr20° Low8°

4 km/h aus N 65 % 91 % 1029 hPa Rain last 24 h 0,0 mm (measured, as of 05:00) 07:12 19:23 waxing gibbous (82 %)

Rain Radar

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The next few days

Day	Min	Max	Risk	Sun
Di, 22.09.	8°	20°	5 %	7,0 h	07:12	19:23
Mi, 23.09.	7°	21° 17:00	2 %	10,5 h	07:14	19:20
Do, 24.09.	11°	20° 16:00	3 %	6,5 h	07:15	19:18
Fr, 25.09.	6°	21° 17:00	1 %	10,7 h	07:17	19:16
Sa, 26.09.	7°	23° 17:00	2 %	10,6 h	07:18	19:14
So, 27.09.	11°	25° 16:00	3 %	10,0 h	07:20	19:12
Mo, 28.09.	14°	25° 17:00	4 %	8,8 h	07:21	19:10
Di, 29.09.	14°	24° 16:00	4 %	7,4 h	07:23	19:07
Mi, 30.09.	13°	23° 16:00	5 %	7,8 h	07:24	19:05
Do, 01.10.	13°	23° 16:00	6 %	7,0 h	07:26	19:03

Outlook: the next few weeks

A genuine day-by-day forecast only reaches about 10 days out – anything beyond that is statistics, not a forecast. That's why we don't show a 30- or 90-day outlook. What can be honestly stated is the long-term normal: in Heidelberg the average temperature in September is 16,0 °C, in October it's 11,3 °C (1991-2020 climate mean for the local climate station, see below). We show openly how often our forecast actually holds up.

How reliable is the forecast?

How our forecast daily high has shifted across recent runs. Flat line = the forecast is holding, jittery = still shifting.

Di, 22.09.20° wackelt noch (±1,5 °C über 12 Läufe)

Mi, 23.09.21° wackelt noch (±1,7 °C über 12 Läufe)

Do, 24.09.20° wackelt noch (±2,2 °C über 12 Läufe)

Fr, 25.09.21° wackelt noch (±1,2 °C über 12 Läufe)

Today at a glanceDi, 22.09.

Garden no frost

Low of 2,9 °C in 48 h, 0,0 mm rain in 24 h. Spray/watering window: 06:00 to 05:00 (48 h) – dry, calm, stays dry afterwards. Product-dependent – check the label.

Outdoors dry

06:00 to 05:00 (48 h) · gusts up to 20 km/h.

Pollen Ragweed: low load

Also Grasses none to low load.

Region Oberrhein und unteres Neckartal · As of 21.09., 11:00 Uhr · DWD pollen forecast

Balcony solar: today ≈ 3,18 kWh per kWp, tomorrow 4,53 kWh · Best 2 h for high loads today: 15:00 to 16:00 (south, vertical) – adjust to your orientation in the app.

Climate in Heidelberg (1991-2020)

The warmest month in Heidelberg is Juli (avg 20,8 °C), the coldest is Januar (avg 2,8 °C). The most rain falls in Juli (avg 73,2 mm), the least in April (avg 42,7 mm). The sunniest month is Juli (avg 239,5 h).

Annual mean 11,6 °C, 697 mm precipitation, 1714 hours of sunshine, 65 frost days. Weather station Heidelberg (2,2 km away).

Record on 22.09.: 29,6 °C (2003), coldest value 1,9 °C (1948), highest rainfall 28,3 mm (1990) – series since 1781

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