Weather in Hemer

Forecast: MOSMIX (DWD-Statistik über ICON + ECMWF) · Run 21.09. 23:00 Uhr · Station MENDEN_LENDRINGSEN (4,6 km from the centre) · own station correction +1,5 °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 ±1,4 °C here (up to 24 h), rain forecast 83 % correct.
Today: settled weather – historically easy to forecast.
We beat the "same as yesterday" rule of thumb by 56 %.

Now · as of 06:00

12°bedeckt

Later today

High · 16:00 Uhr18° Low12°

4 km/h aus W 68 % 88 % 1030 hPa Rain last 24 h 0,0 mm (measured, as of 05:00) 07:15 19:26 waxing gibbous (82 %)

Rain Radar

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The next few days

Day	Min	Max	Risk	Sun
Di, 22.09.	12°	18°	6 %	4,5 h	07:15	19:26
Mi, 23.09.	12°	19° 16:00	10 %	5,9 h	07:17	19:24
Do, 24.09.	13°	18° 16:00	20 %	4,9 h	07:19	19:21
Fr, 25.09.	10°	20° 16:00	2 %	9,1 h	07:20	19:19
Sa, 26.09.	14°	22° 16:00	6 %	7,3 h	07:22	19:17
So, 27.09.	16°	24° 16:00	6 %	6,8 h	07:23	19:15
Mo, 28.09.	17°	23° 16:00	9 %	6,5 h	07:25	19:12
Di, 29.09.	17°	24° 16:00	7 %	5,9 h	07:27	19:10
Mi, 30.09.	17°	22° 16:00	11 %	5,9 h	07:28	19:08
Do, 01.10.	16°	21° 16:00	20 %	6,0 h	07:30	19:05

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 Hemer the average temperature in September is 13,6 °C, in October it's 9,7 °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, 22.09.18° stabil (±0,5 °C über 12 Läufe)

Mi, 23.09.19° stabil (±0,7 °C über 12 Läufe)

Do, 24.09.18° stabil (±0,8 °C über 12 Läufe)

Fr, 25.09.20° wackelt noch (±1,6 °C über 12 Läufe)

Today at a glanceDi, 22.09.

Garden no frost

Low of 6,5 °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 17 km/h.

Pollen Grasses: none to low load

Also Ragweed none to low load.

Region Rhein.-Westfäl. Tiefland · As of 21.09., 11:00 Uhr · DWD pollen forecast

Balcony solar: today ≈ 2,02 kWh per kWp, tomorrow 2,41 kWh · Best 2 h for high loads today: 14:00 to 15:00 (south, vertical) – adjust to your orientation in the app.

Climate in Hemer (1991-2020)

The warmest month in Hemer is Juli (avg 17,7 °C), the coldest is Januar (avg 1,8 °C). The most rain falls in Dezember (avg 100,1 mm), the least in April (avg 58,5 mm). The sunniest month is Juli (avg 201,3 h).

Annual mean 9,4 °C, 1033 mm precipitation, 1533 hours of sunshine, 72 frost days. Weather station Iserlohn-Westig (1,2 km away).

Record on 22.09.: 30,4 °C (2006), coldest value 4,1 °C (2022), highest rainfall 17,4 mm (2004) – series since 1975

Weather nearby

Iserlohn · Menden · Schwerte · Unna · Hagen · Lüdenscheid · all towns