How warm is it in St. Moritz in May?

Daytime highs averaged 9.4 °C, night-time lows 0.2 °C. The highest value of the past 10 years was 19.8 °C (25 May 2026), the lowest -8.8 °C (6 May 2019).

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

On average there were 22.4 rain days (at least 1 mm) with 135 mm of precipitation in total.

🇨🇭 Weather in St. Moritz in May

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

Key facts at a glance

Prevailing weather: Light rain

Avg. daytime high

9.4 °C

6.3 °C – 11.8 °C

Avg. night-time low

0.2 °C

-2.9 °C – 2.3 °C

Avg. rain days in period

22.4

72 % of days · ≥ 1.0 mm

Avg. precipitation in period

135 mm

76.0 mm – 248 mm

Avg. cloud cover

74 %

This data source has no sunshine hours – average cloud cover shown instead.

Avg. sea temperature

–

No sea nearby – no sea temperature.

Extremes: Highest temperature 19.8 °C (25 May 2026) · Lowest temperature -8.8 °C (6 May 2019) · Avg. daily peak wind 11 km/h

Weather mix of all days

17Sunny
56Partly cloudy
13Cloudy
142Light rain
82Rain

Summary

On average 9.4 °C during the day and 0.2 °C at night.
On average 22.4 rain days (Rain day = at least 1.0 mm of precipitation) with 135 mm of precipitation in total.
Prevailing: Light rain.
Warmest year: 2022 (avg. 11.8 °C), coolest: 2019 (avg. 6.3 °C).
Wettest year: 2023 (248 mm), driest: 2026 (76.0 mm).
Extremes: 19.8 °C on 25 May 2026 and -8.8 °C on 6 May 2019.

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. max11.0°Avg. min1.0°
Rain days
15 Rain days
Precipitation
76.0 mm
Avg. cloud cover
61 % cloudy
Sea temperature
–
Max 19.8 °C · Min -6.6 °C
2025
Avg. max9.4°Avg. min0.1°
Rain days
20 Rain days
Precipitation
152 mm
Avg. cloud cover
73 % cloudy
Sea temperature
–
Max 18.2 °C · Min -5.0 °C
2024
Avg. max8.5°Avg. min0.7°
Rain days
28 Rain days
Precipitation
195 mm
Avg. cloud cover
85 % cloudy
Sea temperature
–
Max 14.0 °C · Min -2.8 °C
2023
Avg. max9.3°Avg. min0.7°
Rain days
29 Rain days
Precipitation
248 mm
Avg. cloud cover
80 % cloudy
Sea temperature
–
Max 15.3 °C · Min -3.3 °C
2022
Avg. max11.8°Avg. min2.3°
Rain days
23 Rain days
Precipitation
103 mm
Avg. cloud cover
76 % cloudy
Sea temperature
–
Max 17.2 °C · Min -2.6 °C
2021
Avg. max6.7°Avg. min-2.5°
Rain days
23 Rain days
Precipitation
131 mm
Avg. cloud cover
76 % cloudy
Sea temperature
–
Max 12.6 °C · Min -7.2 °C
2020
Avg. max10.7°Avg. min0.3°
Rain days
17 Rain days
Precipitation
100 mm
Avg. cloud cover
65 % cloudy
Sea temperature
–
Max 15.3 °C · Min -6.1 °C
2019
Avg. max6.3°Avg. min-2.9°
Rain days
22 Rain days
Precipitation
124 mm
Avg. cloud cover
78 % cloudy
Sea temperature
–
Max 13.5 °C · Min -8.8 °C
2018
Avg. max10.3°Avg. min2.1°
Rain days
29 Rain days
Precipitation
128 mm
Avg. cloud cover
82 % cloudy
Sea temperature
–
Max 15.5 °C · Min -3.4 °C
2017
Avg. max10.4°Avg. min0.3°
Rain days
18 Rain days
Precipitation
94.1 mm
Avg. cloud cover
69 % cloudy
Sea temperature
–
Max 18.4 °C · Min -7.3 °C

Frequently asked questions

How warm is it in St. Moritz in May?: Daytime highs averaged 9.4 °C, night-time lows 0.2 °C. The highest value of the past 10 years was 19.8 °C (25 May 2026), the lowest -8.8 °C (6 May 2019).
How often does it rain in St. Moritz in May?: On average there were 22.4 rain days (at least 1 mm) with 135 mm of precipitation in total.

Check your exact travel dates

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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)