worldweather21°Cwarmer than usual
usually 15°C–23°C
warmer than 70% of similar days
night: exceptionally warm
rain: more rain than usual
wind: typical
Weather in St. Gallen - 14-day forecast
Detailed weather forecast for St. Gallen, Switzerland: daytime and night temperature, rain, sunrise and sunset - today and for the next two weeks.
Forecast for the next days in St. Gallen
today🌧️
21°💧 7 mm
Sun☁️
23°💧 0.4 mm
Mon🌧️
27°💧 1.2 mm
Tue🌧️
24°💧 3.6 mm
Wed🌧️
12°💧 23.2 mm
Thu☁️
16°💧 5.6 mm
Fri🌧️
20°💧 1.8 mm
Sat🌧️
19°💧 4.1 mm
Forecast vs 1991-2020 climate normal
NASA POWERHow does the current forecast compare with normal?
We compare the coming days with weather usually observed at this time of year.
Monday 7 Sept in St. Gallen, the forecast high is 27°C. Typical daytime temperatures at this time of year range from 15°C to 22°C, so it will be exceptionally warm. It is warmer than 100% of similar days.
23°Cwarmer than usual
usually 15°C–22°C
warmer than 85% of similar days
night: exceptionally warm
rain: typical rainfall
wind: exceptionally light
27°Cexceptionally warm
usually 15°C–22°C
warmer than 100% of similar days
night: exceptionally warm
rain: typical rainfall
wind: typical
24°Cexceptionally warm
usually 15°C–22°C
warmer than 95% of similar days
night: exceptionally warm
rain: typical rainfall
wind: typical
12°Cexceptionally cool
usually 15°C–22°C
cooler than 94% of similar days
night: near normal
rain: exceptionally wet
wind: exceptionally light
16°Cnear normal
usually 15°C–22°C
night: near normal
rain: more rain than usual
wind: lighter than usual
20°Cnear normal
usually 15°C–22°C
night: warmer than usual
rain: typical rainfall
wind: exceptionally strong
How warm was this week in previous years?
Each bar shows the average daily high during the same 7-day period in each year.
cooler yearstypical rangewarmer years2026 forecastcurrent forecast
From 1981 to 2025, the 5-11 Sept period averaged 19°C by day. The coolest year was 1984 (12°C) and the warmest was 2023 (26°C). The current forecast averages 21°C - higher than in 69% of historical years.
Historical reference: NASA POWER daily gridded data (MERRA-2), the 1991-2020 normal and a +/- 7-day calendar window. The typical range is the 20th-80th percentile. This is not a city weather-station reading and does not change the current forecast. NASA POWER Daily API.
Weather warnings - St. Gallen
No active weather warnings for St. Gallen (region: Bodenseekreis). The national weather service is not forecasting dangerous conditions.
14-day forecast - St. Gallen
St. Gallen 30 & 45-day weather - long-range outlook
Next 16 days · forecast
20°
around 15° at night · days with rain: 11
Weeks 3-4 · avg for September
20°
around 11° at night · rain chance 49%
Weeks 5-7 · avg for October
14°
around 8° at night · rain chance 47%
The 30 & 45-day outlook for St. Gallen: the next 16 days are a numerical forecast updated daily - on average 20° by day and 15° at night. Further out we rely on multi-year climate averages: around 20° in September, and about 14° in October. Forecasts beyond two weeks are indicative only.
Day-by-day forecast for St. Gallen
Saturday5 September 2026
🌧️21°moderate rain
Sunday6 September 2026
☁️23°broken clouds
Monday7 September 2026
🌧️27°light rain
Tuesday8 September 2026
🌧️24°light rain
Wednesday9 September 2026
🌧️12°moderate rain
Thursday10 September 2026
☁️16°overcast clouds
Friday11 September 2026
🌧️20°light rain
Saturday12 September 2026
🌧️19°light rain
Sunday13 September 2026
🌧️15°moderate rain
Monday14 September 2026
☁️18°broken clouds
Tuesday15 September 2026
🌧️22°light rain
Wednesday16 September 2026
🌧️16°moderate rain
Thursday17 September 2026
🌤️18°scattered clouds
Friday18 September 2026
☀️20°clear sky
Saturday19 September 2026
☀️22°clear sky
Sunday20 September 2026
🌤️22°a few clouds
UV index in St. Gallen - is it safe to sunbathe?
Today the UV index in St. Gallen is 5 (moderate) - unprotected fair skin can burn in about 40 minutes. Seek shade around midday. SPF 30+, sunglasses and a hat for longer stays.
Pollen in St. Gallen - info for allergy sufferers
Today ragweed pollen is highest in St. Gallen - about 6 grains/m³, low level. Most allergy sufferers should not feel strong symptoms. Pollen levels are a CAMS model forecast and are indicative.
St. Gallen weather through the year
Warmest, driest months on average: April, May, June, July.
Upcoming public holidays in Switzerland: Christmas Day — 25 December · New Year's Day — 1 January · Ascension Day — 6 May.
Nearby and related places
FAQ - St. Gallen weather
What is the weather like in St. Gallen today?
Today it is about 21° during the day and 18° at night, moderate rain.
How far ahead can I check the forecast for St. Gallen?
This page shows a detailed 14-day forecast plus the long-term monthly climate, so you can plan both a short trip and a holiday months ahead.