How warm is it in St. Moritz in August?

Daytime highs averaged 16.6 °C, night-time lows 7.2 °C. The highest value of the past 10 years was 23.1 °C (22 Aug 2023), the lowest -2.0 °C (26 Aug 2018).

How often does it rain in St. Moritz in August?

On average there were 18.4 rain days (at least 1 mm) with 152 mm of precipitation in total.

🇨🇭 Weather in St. Moritz in August

This is what the weather in St. Moritz (Grisons, Switzerland) was like in August in 2017–2026.

Key facts at a glance

Prevailing weather: Light rain

Avg. daytime high

16.6 °C

14.4 °C – 18.5 °C

Avg. night-time low

7.2 °C

4.8 °C – 9.1 °C

Avg. rain days in period

18.4

59 % of days · ≥ 1.0 mm

Avg. precipitation in period

152 mm

75.6 mm – 220 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 23.1 °C (22 Aug 2023) · Lowest temperature -2.0 °C (26 Aug 2018) · Avg. daily peak wind 10 km/h

Weather mix of all days

40Sunny
62Partly cloudy
7Cloudy
103Light rain
81Rain

Summary

On average 16.6 °C during the day and 7.2 °C at night.
On average 18.4 rain days (Rain day = at least 1.0 mm of precipitation) with 152 mm of precipitation in total.
Prevailing: Light rain.
Warmest year: 2026 (avg. 18.5 °C), coolest: 2021 (avg. 14.4 °C).
Wettest year: 2020 (220 mm), driest: 2024 (75.6 mm).
Extremes: 23.1 °C on 22 Aug 2023 and -2.0 °C on 26 Aug 2018.

Overall values from all 10 years. How is this calculated?

Temperatures per year

Average over your travel period

Precipitation & rain days

Year by year

2026
Avg. max18.5°Avg. min9.1°
Rain days
14 Rain days
Precipitation
123 mm
Avg. sunshine per day
n/a
Sea temperature
–
Max 22.5 °C · Min 2.4 °C
2025
Avg. max16.4°Avg. min7.0°
Rain days
17 Rain days
Precipitation
160 mm
Avg. cloud cover
52 % cloudy
Sea temperature
–
Max 22.7 °C · Min 1.7 °C
2024
Avg. max17.9°Avg. min9.0°
Rain days
17 Rain days
Precipitation
75.6 mm
Avg. cloud cover
53 % cloudy
Sea temperature
–
Max 21.9 °C · Min 5.5 °C
2023
Avg. max16.3°Avg. min6.6°
Rain days
18 Rain days
Precipitation
210 mm
Avg. cloud cover
62 % cloudy
Sea temperature
–
Max 23.1 °C · Min -1.4 °C
2022
Avg. max17.4°Avg. min7.2°
Rain days
17 Rain days
Precipitation
103 mm
Avg. cloud cover
53 % cloudy
Sea temperature
–
Max 21.5 °C · Min 2.7 °C
2021
Avg. max14.4°Avg. min4.8°
Rain days
18 Rain days
Precipitation
156 mm
Avg. cloud cover
62 % cloudy
Sea temperature
–
Max 20.1 °C · Min -0.4 °C
2020
Avg. max16.1°Avg. min6.5°
Rain days
19 Rain days
Precipitation
220 mm
Avg. cloud cover
60 % cloudy
Sea temperature
–
Max 20.7 °C · Min -0.4 °C
2019
Avg. max16.2°Avg. min7.3°
Rain days
22 Rain days
Precipitation
169 mm
Avg. cloud cover
65 % cloudy
Sea temperature
–
Max 19.9 °C · Min 1.5 °C
2018
Avg. max16.2°Avg. min7.6°
Rain days
26 Rain days
Precipitation
180 mm
Avg. cloud cover
63 % cloudy
Sea temperature
–
Max 20.9 °C · Min -2.0 °C
2017
Avg. max16.5°Avg. min6.8°
Rain days
16 Rain days
Precipitation
124 mm
Avg. cloud cover
59 % cloudy
Sea temperature
–
Max 21.3 °C · Min 0.2 °C

Frequently asked questions

How warm is it in St. Moritz in August?: Daytime highs averaged 16.6 °C, night-time lows 7.2 °C. The highest value of the past 10 years was 23.1 °C (22 Aug 2023), the lowest -2.0 °C (26 Aug 2018).
How often does it rain in St. Moritz in August?: On average there were 18.4 rain days (at least 1 mm) with 152 mm of precipitation in total.

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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)