What is the weather in Herisau today?

At the top of the page you will find the current temperature, precipitation and wind in Herisau, updated in real time.

What is the 15-day forecast for Herisau?

The "15-day forecast" section shows min/max temperatures, precipitation and wind expected for the next 15 days in Herisau.

Will it rain tomorrow in Herisau?

Check the 48-hour hourly forecast to see exactly when precipitation is expected in Herisau.

What is the air quality in Herisau?

The air quality section displays the AQI index and PM2.5, PM10 and ozone concentrations measured near Herisau.

Are there weather alerts for Herisau?

Weather alerts (storms, high winds, extreme temperatures) are shown as a banner at the top of the page when active.

At what altitude is Herisau located?

Herisau sits at around 793 m above sea level in the canton of Appenzell Outer Rhodes. This elevation directly affects the temperatures, rain-snow line and snow cover shown in the forecasts.

What is the warmest month in Herisau?

The warmest month in Herisau is July, averaging 17.0 °C (1991–2020 normal). The coldest is January at 0.4 °C.

How much does it rain in Herisau per year?

Herisau receives about 1530 mm of precipitation a year. The wettest month is August (176 mm), the driest February (89 mm).

When is the best time to visit Herisau?

For warmth and sunshine: July (17.0 °C on average, 222 h of sun). The coldest month is January (0.4 °C). Check the 15-day forecast above for your dates.

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Home › Appenzell Outer Rhodes › Herisau

Weather in Herisau

Appenzell Outer Rhodes, 793 m · continuously updated

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Wind: –
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Sunset: –

Temperature · last 4 and next 28 hours

Herisau weather: the next 24 hours

Updated hourly.

Herisau weather hour by hour (48 h)

Herisau 15-day forecast

Two-week trend.

Herisau weekend weather Rain radar

Sun and golden hours

Sunrise –, golden light until –

Sunset –, golden light from –

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Air quality

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European index, measured continuously.

UV index

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Daily maximum — protection advised from 3.

Freezing level

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Snow settles about 300 m below it.

Around Herisau

Neighbouring municipalities, as the crow flies.

Waldstatt3 km Gossau (SG)3 km Schwellbrunn4 km Stein (AR)4 km Urnäsch4 km Flawil5 km Hundwil5 km Gaiserwald6 km

7-day forecast for Herisau

Today (Sunday 27 Sep) in Herisau: mostly sunny, 7 to 22 °C, precipitation 0.0 mm (0 %), wind up to 9 km/h. Tomorrow: partly cloudy, 9 to 23 °C.

Day	Weather	Min	Max	Precip.	Wind
Today	mostly sunny	7 °C	22 °C	0.0 mm	9 km/h
Tomorrow	partly cloudy	9 °C	23 °C	0.0 mm	9 km/h
Tue 29 Sep	overcast	12 °C	22 °C	0.0 mm	7 km/h
Wed 30 Sep	overcast	14 °C	23 °C	0.0 mm	8 km/h
Thu 1 Oct	light rain	13 °C	18 °C	4.7 mm	6 km/h
Fri 2 Oct	fog	13 °C	16 °C	0.6 mm	7 km/h
Sat 3 Oct	fog	12 °C	18 °C	0.0 mm	6 km/h

Forecast updated on 27.09.2026 at 04:37 (Open-Meteo model, elevation 793 m). The interactive block at the top refreshes hourly and covers 16 days.

No rain expected in Herisau today or tomorrow. The 15-minute detail for the next two hours is shown on demand.

Hourly weather in Herisau

Sunday 27 Sep in Herisau, hour by hour: sunny in the morning, sunny in the afternoon, sunny in the evening. Low 8 °C around 00:00, high 22 °C around 16:00. No rainy hour.

Show the 24-hour table

Time	Weather	Temp.	Wind
00:00	sunny	8 °C	9 km/h
01:00	sunny	8 °C	8 km/h
02:00	sunny	8 °C	8 km/h
03:00	sunny	9 °C	8 km/h
04:00	sunny	10 °C	7 km/h
05:00	sunny	10 °C	7 km/h
06:00	sunny	10 °C	7 km/h
07:00	sunny	9 °C	8 km/h
08:00	sunny	9 °C	7 km/h
09:00	sunny	12 °C	6 km/h
10:00	sunny	17 °C	2 km/h
11:00	sunny	19 °C	2 km/h
12:00	sunny	20 °C	3 km/h
13:00	sunny	21 °C	4 km/h
14:00	sunny	22 °C	6 km/h
15:00	sunny	22 °C	4 km/h
16:00	sunny	22 °C	2 km/h
17:00	mostly sunny	22 °C	0 km/h
18:00	sunny	21 °C	2 km/h
19:00	sunny	18 °C	5 km/h
20:00	sunny	14 °C	8 km/h
21:00	sunny	11 °C	9 km/h
22:00	sunny	10 °C	8 km/h
23:00	sunny	10 °C	8 km/h

Hourly forecast issued 27.09.2026 for Herisau (793 m), Swiss local time, Open-Meteo model. The interactive block at the top of the page covers 16 days and refreshes every hour.

Herisau weather tomorrow

Tomorrow, Monday 28 Sep, in Herisau: partly cloudy, 9 to 23 °C, wind up to 9 km/h. No precipitation expected.

Herisau weekend weather

This weekend in Herisau: Saturday fog, 12 to 18 °C; Sunday mostly sunny, 7 to 22 °C.

Will it rain in Herisau this week?

Yes: 1 day with precipitation is expected in Herisau over the next 7 days, 5.3 mm in total. Wettest day: Thursday 1 Oct (4.7 mm).

The best day to go out in Herisau

The best day of the next 7 in Herisau: Sunday 27 Sep, mostly sunny, up to 22 °C.

The last 7 days in Herisau

From 20 Sep to 26 Sep: 13.0 °C on average, in line with the September normal (12.9 °C), 0 mm of precipitation (7-day normal: 31 mm). Warmest day: sunday 20 Sep (22 °C); coolest night: tuesday 22 Sep (5 °C).

Day	Min	Max
Sun 20 Sep	9 °C	22 °C
Mon 21 Sep	10 °C	16 °C
Tue 22 Sep	5 °C	16 °C
Wed 23 Sep	6 °C	18 °C
Thu 24 Sep	11 °C	18 °C
Fri 25 Sep	6 °C	17 °C
Sat 26 Sep	7 °C	21 °C

Open-Meteo analyses of the last 7 days (models and assimilated observations), MeteoSwiss 1991–2020 normals. Updated nightly.

Climate of Herisau: 1991–2020 normals

In Herisau (793 m), the mean annual temperature is 8.4 °C. The warmest month is July (17.0 °C on average) and the coldest January (0.4 °C). About 1530 mm of precipitation falls per year, peaking in August (176 mm) with a minimum in February (89 mm). The sun shines for about 1589 hours a year, mostly in July (222 h). On average there are 94 frost days and 2 hot days (≥ 30 °C) per year. The mean monthly maximum reaches 28.5 °C and the absolute minimum −10.5 °C.

8.4 °CMean annual temperature

1530 mmPrecipitation per year

1589 hSunshine hours per year

94Frost days per year

26Summer days (≥ 25 °C)

JFMAMJJASOND

Mean monthly precipitation (mm) — bar height relative to the wettest month.

Month	Mean T	Abs. max	Abs. min	Precip. (mm)	Sunshine (h)	Frost days	Summer days
Jan	0.4 °C	11.9 °C	−10.5 °C	100	56	22	0
Feb	0.8 °C	12.6 °C	−10.1 °C	89	79	19	0
Mar	3.9 °C	16.0 °C	−6.8 °C	111	130	14	0
Apr	7.5 °C	19.6 °C	−3.2 °C	104	165	6	0
May	11.6 °C	23.9 °C	1.6 °C	151	182	0	2
Jun	15.1 °C	27.2 °C	5.4 °C	162	196	0	6
Jul	17.0 °C	28.5 °C	8.0 °C	172	222	0	9
Aug	16.8 °C	28.0 °C	7.4 °C	176	204	0	8
Sep	12.9 °C	23.7 °C	3.7 °C	134	150	0	1
Oct	9.2 °C	20.6 °C	−0.5 °C	108	100	2	0
Nov	4.4 °C	16.6 °C	−5.4 °C	104	58	11	0
Dec	1.4 °C	12.6 °C	−9.1 °C	120	47	20	0
Year	8.4 °C	28.5 °C	−10.5 °C	1530	1589	94	26

Source: MeteoSwiss open data (1991–2020 normals) — stations St. Gallen (10 km, 776 m), Säntis (15 km, 2501 m), Ebnat-Kappel (18 km, 623 m), adjusted to the elevation of Herisau (793 m) using a 0.55 °C/100 m lapse rate. Indicative, rounded values.