About Altnau
Altnau is a Swiss municipality located in the canton of Thurgau (TG), at 47.603° latitude and 9.259° longitude. The municipality is part of the Lake Constance basin, mild and humid climate, frequent autumn fog. Also known as Altnau, Altnau benefits from precise weather monitoring with hourly and 15-day forecasts.
Climate of Altnau
The climate in Altnau is characteristic of the Lake Constance basin, mild and humid climate, frequent autumn fog. 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 Altnau and neighboring municipalities.
On this page you will find the detailed weather forecast for Altnau: current temperature, 48-hour hourly forecast, 15-day forecast, air quality, UV index, wind, precipitation and weather alerts. Updated hourly.
Climate of Altnau: 1991–2020 normals
In Altnau (487 m), the mean annual temperature is 9.6 °C. The warmest month is July (18.9 °C on average) and the coldest January (0.8 °C). About 962 mm of precipitation falls per year, peaking in June (111 mm) with a minimum in February (53 mm). The sun shines for about 1718 hours a year, mostly in July (246 h). On average there are 75 frost days and 8 hot days (≥ 30 °C) per year. The mean monthly maximum reaches 31.3 °C and the absolute minimum −8.0 °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 | 0.8 °C | 11.3 °C | −8.0 °C | 55 | 47 | 20 | 0 |
| Feb | 1.4 °C | 13.0 °C | −7.7 °C | 53 | 79 | 18 | 0 |
| Mar | 5.3 °C | 18.3 °C | −4.5 °C | 60 | 147 | 10 | 0 |
| Apr | 9.2 °C | 23.2 °C | −1.3 °C | 66 | 189 | 3 | 0 |
| May | 13.5 °C | 27.2 °C | 3.1 °C | 102 | 209 | 0 | 3 |
| Jun | 17.2 °C | 30.5 °C | 6.9 °C | 111 | 226 | 0 | 10 |
| Jul | 18.9 °C | 31.3 °C | 9.3 °C | 109 | 246 | 0 | 15 |
| Aug | 18.4 °C | 30.6 °C | 8.7 °C | 109 | 224 | 0 | 14 |
| Sep | 14.2 °C | 25.5 °C | 5.1 °C | 80 | 163 | 0 | 3 |
| Oct | 9.7 °C | 21.0 °C | 1.0 °C | 72 | 97 | 1 | 0 |
| Nov | 4.7 °C | 16.1 °C | −3.3 °C | 68 | 51 | 6 | 0 |
| Dec | 1.6 °C | 12.1 °C | −7.6 °C | 76 | 40 | 17 | 0 |
| Year | 9.6 °C | 31.3 °C | −8.0 °C | 962 | 1718 | 75 | 46 |
Source: MeteoSwiss open data (1991–2020 normals) — stations Güttingen (2 km, 440 m), Salen-Reutenen (18 km, 719 m), St. Gallen (22 km, 776 m), adjusted to the elevation of Altnau (487 m) using a 0.55 °C/100 m lapse rate. Indicative, rounded values.
Nearby cities
Check the weather of cities near Altnau:
- Weather Güttingen
- Weather Langrickenbach
- Weather Münsterlingen
- Weather Lengwil
- Weather Sommeri
- Weather Kesswil
- Weather Birwinken
- Weather Dozwil
- Weather Bottighofen
- Weather Erlen
- Weather Hefenhofen
- Weather Amriswil
→ Nearby cities · Canton Thurgau
Frequently asked questions about weather in Altnau
What is the weather in Altnau today?
At the top of the page you will find the current temperature, precipitation and wind in Altnau, updated in real time.
What is the 15-day forecast for Altnau?
The "15-day forecast" section shows min/max temperatures, precipitation and wind expected for the next 15 days in Altnau.
Will it rain tomorrow in Altnau?
Check the 48-hour hourly forecast to see exactly when precipitation is expected in Altnau.
What is the air quality in Altnau?
The air quality section displays the AQI index and PM2.5, PM10 and ozone concentrations measured near Altnau.
Are there weather alerts for Altnau?
Weather alerts (storms, high winds, extreme temperatures) are shown as a banner at the top of the page when active.
At what altitude is Altnau located?
Altnau sits at around 487 m above sea level in the canton of Thurgau. This elevation directly affects the temperatures, rain-snow line and snow cover shown in the forecasts.
What is the warmest month in Altnau?
The warmest month in Altnau is July, averaging 18.9 °C (1991–2020 normal). The coldest is January at 0.8 °C.
How much does it rain in Altnau per year?
Altnau receives about 962 mm of precipitation a year. The wettest month is June (111 mm), the driest February (53 mm).
When is the best time to visit Altnau?
For warmth and sunshine: July (18.9 °C on average, 246 h of sun). The coldest month is January (0.8 °C). Check the 15-day forecast above for your dates.