About Herisau
Herisau is a Swiss municipality located in the canton of Appenzell Outer Rhodes (AR), at 47.379° latitude and 9.288° longitude. The municipality is part of the eastern Alps, alpine climate with snowy winters and cool summers. Also known as Herisau, Herisau benefits from precise weather monitoring with hourly and 15-day forecasts.
Climate of Herisau
The climate in Herisau is characteristic of the eastern Alps, alpine climate with snowy winters and cool summers. Temperatures, precipitation and wind conditions vary throughout the year with local features linked to altitude and surrounding terrain. Our data comes from official weather stations and real-time Netatmo sensors for Herisau and neighboring municipalities.
On this page you will find the detailed weather forecast for Herisau: current temperature, 48-hour hourly forecast, 15-day forecast, air quality, UV index, wind, precipitation and weather alerts. Updated hourly.
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.
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.
Nearby cities
Check the weather of cities near Herisau:
- Weather Waldstatt
- Weather Gossau (SG)
- Weather Schwellbrunn
- Weather Stein (AR)
- Weather Urnäsch
- Weather Flawil
- Weather Hundwil
- Weather Gaiserwald
- Weather Andwil (SG)
- Weather Teufen (AR)
- Weather Degersheim
- Weather St. Gallen
→ Nearby cities · Canton Appenzell Outer Rhodes
Frequently asked questions about weather in Herisau
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.