🇨🇭 Weather in Zermatt in September
This is what the weather in Zermatt (Valais, Switzerland) was like in September in 2017–2026.
Key facts at a glance
Avg. daytime high
12.0 °C
8.6 °C – 15.7 °C
Avg. night-time low
2.7 °C
-0.4 °C – 5.1 °C
Avg. rain days in period
13.1
44 % of days · ≥ 1.0 mm
Avg. precipitation in period
78.5 mm
19.5 mm – 179 mm
Avg. sunshine per day
n/a
Sunshine duration is not available from this data source.
Avg. sea temperature
–
No sea nearby – no sea temperature.
Extremes: Highest temperature 20.9 °C (4 Sep 2026) · Lowest temperature -9.1 °C (27 Sep 2020) · Avg. daily peak wind 11 km/h
Weather mix of all days
- 58Sunny
- 61Partly cloudy
- 23Cloudy
- 79Light rain
- 52Rain
Summary
- On average 12.0 °C during the day and 2.7 °C at night.
- On average 13.1 rain days (Rain day = at least 1.0 mm of precipitation) with 78.5 mm of precipitation in total.
- Prevailing: Light rain.
- Warmest year: 2026 (avg. 15.7 °C), coolest: 2017 (avg. 8.6 °C).
- Wettest year: 2024 (179 mm), driest: 2026 (19.5 mm).
- Extremes: 20.9 °C on 4 Sep 2026 and -9.1 °C on 27 Sep 2020.
Overall values from all 10 years. How is this calculated?
Charts
Temperatures per year
Average over your travel period
Precipitation & rain days
Year by year
2026
Avg. max15.7°Avg. min4.6°- Rain days
- 3 Rain days
- Precipitation
- 19.5 mm
- Avg. sunshine per day
- n/a
- Sea temperature
- –
Max 20.9 °C · Min 1.5 °C
2025
Avg. max11.4°Avg. min2.2°- Rain days
- 16 Rain days
- Precipitation
- 124 mm
- Avg. cloud cover
- 67 % cloudy
- Sea temperature
- –
Max 18.6 °C · Min -2.4 °C
2024
Avg. max9.0°Avg. min1.3°- Rain days
- 18 Rain days
- Precipitation
- 179 mm
- Avg. cloud cover
- 72 % cloudy
- Sea temperature
- –
Max 16.3 °C · Min -5.4 °C
2023
Avg. max14.9°Avg. min5.1°- Rain days
- 12 Rain days
- Precipitation
- 67.3 mm
- Avg. cloud cover
- 46 % cloudy
- Sea temperature
- –
Max 19.8 °C · Min -2.9 °C
2022
Avg. max10.5°Avg. min1.4°- Rain days
- 18 Rain days
- Precipitation
- 99.5 mm
- Avg. cloud cover
- 66 % cloudy
- Sea temperature
- –
Max 19.2 °C · Min -5.1 °C
2021
Avg. max12.4°Avg. min3.4°- Rain days
- 13 Rain days
- Precipitation
- 73.1 mm
- Avg. cloud cover
- 56 % cloudy
- Sea temperature
- –
Max 15.3 °C · Min -2.6 °C
2020
Avg. max11.9°Avg. min2.7°- Rain days
- 15 Rain days
- Precipitation
- 74.7 mm
- Avg. cloud cover
- 54 % cloudy
- Sea temperature
- –
Max 18.9 °C · Min -9.1 °C
2019
Avg. max11.9°Avg. min2.7°- Rain days
- 10 Rain days
- Precipitation
- 51.3 mm
- Avg. cloud cover
- 55 % cloudy
- Sea temperature
- –
Max 18.0 °C · Min -3.5 °C
2018
Avg. max13.6°Avg. min3.9°- Rain days
- 13 Rain days
- Precipitation
- 49.6 mm
- Avg. cloud cover
- 45 % cloudy
- Sea temperature
- –
Max 18.0 °C · Min -3.0 °C
2017
Avg. max8.6°Avg. min-0.4°- Rain days
- 13 Rain days
- Precipitation
- 47.1 mm
- Avg. cloud cover
- 72 % cloudy
- Sea temperature
- –
Max 15.1 °C · Min -4.9 °C
Frequently asked questions
- How warm is it in Zermatt in September?
- Daytime highs averaged 12.0 °C, night-time lows 2.7 °C. The highest value of the past 10 years was 20.9 °C (4 Sep 2026), the lowest -9.1 °C (27 Sep 2020).
- How often does it rain in Zermatt in September?
- On average there were 13.1 rain days (at least 1 mm) with 78.5 mm of precipitation in total.
Check your exact travel dates
Choose your travel period – we show the weather for exactly those days.
Other destinations in September
Data sources
- Weather data
- Data obtained from the NASA Langley Research Center (LaRC) POWER Project funded through the NASA Earth Science/Applied Science Program
Reanalysis (weather model constrained by observations) on a coarse grid of about 50 km. Values represent a large area and can differ from local conditions, especially on islands, coasts and in mountains. No sunshine duration.
Reanalysis (weather model constrained by observations)
Reanalysis values represent a grid cell (approx. 25–50 km) and may differ from local measurements on coasts, islands and in mountains. - Sea temperature
- MUR SST data were provided by JPL under support by NASA MEaSUREs program; accessed via NOAA CoastWatch ERDDAP
Daily multi-scale ultra-high resolution (≈ 1 km) analysis of satellite measurements (infrared, microwave) and in-situ data. Represents the foundation temperature below the daily warm surface layer. (Satellite and in-situ analysis) - Place search
- Natural Earth (public domain) · GeoNames (CC BY 4.0) / OpenStreetMap (ODbL)