How warm is it in Lugano in September?

Daytime highs averaged 20.5 °C, night-time lows 12.3 °C. The highest value of the past 10 years was 29.1 °C (5 Sep 2026), the lowest 2.4 °C (27 Sep 2020).

How often does it rain in Lugano in September?

On average there were 12.7 rain days (at least 1 mm) with 118 mm of precipitation in total.

🇨🇭 Weather in Lugano in September

This is what the weather in Lugano (Ticino, Switzerland) was like in September in 2017–2026.

Key facts at a glance

Prevailing weather: Light rain

Avg. daytime high

20.5 °C

18.2 °C – 23.7 °C

Avg. night-time low

12.3 °C

9.6 °C – 14.1 °C

Avg. rain days in period

12.7

42 % of days · ≥ 1.0 mm

Avg. precipitation in period

118 mm

40.1 mm – 205 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 29.1 °C (5 Sep 2026) · Lowest temperature 2.4 °C (27 Sep 2020) · Avg. daily peak wind 12 km/h

Weather mix of all days

46Sunny
66Partly cloudy
38Cloudy
70Light rain
57Rain

Summary

On average 20.5 °C during the day and 12.3 °C at night.
On average 12.7 rain days (Rain day = at least 1.0 mm of precipitation) with 118 mm of precipitation in total.
Prevailing: Light rain.
Warmest year: 2026 (avg. 23.7 °C), coolest: 2017 (avg. 18.2 °C).
Wettest year: 2024 (205 mm), driest: 2018 (40.1 mm).
Extremes: 29.1 °C on 5 Sep 2026 and 2.4 °C on 27 Sep 2020.

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. max23.7°Avg. min13.7°
Rain days
7 Rain days
Precipitation
59.5 mm
Avg. sunshine per day
n/a
Sea temperature
–
Max 29.1 °C · Min 9.7 °C
2025
Avg. max19.4°Avg. min12.3°
Rain days
17 Rain days
Precipitation
204 mm
Avg. cloud cover
67 % cloudy
Sea temperature
–
Max 23.8 °C · Min 4.8 °C
2024
Avg. max18.3°Avg. min11.2°
Rain days
19 Rain days
Precipitation
205 mm
Avg. cloud cover
77 % cloudy
Sea temperature
–
Max 25.3 °C · Min 4.6 °C
2023
Avg. max21.8°Avg. min14.1°
Rain days
11 Rain days
Precipitation
133 mm
Avg. cloud cover
48 % cloudy
Sea temperature
–
Max 26.6 °C · Min 6.7 °C
2022
Avg. max19.6°Avg. min11.3°
Rain days
17 Rain days
Precipitation
122 mm
Avg. cloud cover
69 % cloudy
Sea temperature
–
Max 24.9 °C · Min 4.9 °C
2021
Avg. max20.7°Avg. min13.1°
Rain days
11 Rain days
Precipitation
113 mm
Avg. cloud cover
61 % cloudy
Sea temperature
–
Max 23.5 °C · Min 7.4 °C
2020
Avg. max20.2°Avg. min12.6°
Rain days
10 Rain days
Precipitation
95.1 mm
Avg. cloud cover
57 % cloudy
Sea temperature
–
Max 25.8 °C · Min 2.4 °C
2019
Avg. max21.0°Avg. min12.0°
Rain days
9 Rain days
Precipitation
79.3 mm
Avg. cloud cover
61 % cloudy
Sea temperature
–
Max 27.1 °C · Min 5.8 °C
2018
Avg. max22.2°Avg. min13.4°
Rain days
12 Rain days
Precipitation
40.1 mm
Avg. cloud cover
53 % cloudy
Sea temperature
–
Max 25.5 °C · Min 7.5 °C
2017
Avg. max18.2°Avg. min9.6°
Rain days
14 Rain days
Precipitation
133 mm
Avg. cloud cover
76 % cloudy
Sea temperature
–
Max 23.6 °C · Min 4.3 °C

Frequently asked questions

How warm is it in Lugano in September?: Daytime highs averaged 20.5 °C, night-time lows 12.3 °C. The highest value of the past 10 years was 29.1 °C (5 Sep 2026), the lowest 2.4 °C (27 Sep 2020).
How often does it rain in Lugano in September?: On average there were 12.7 rain days (at least 1 mm) with 118 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)