Locarno in Summer
In summer (June, July and August), Locarno sees average daytime highs around 20°C and overnight lows near 10°C, with 440 mm of precipitation over about 43 wet days across the season. It is the warmest season of the year and the 2nd-wettest season.
Across summer, daytime highs hold fairly steady around 20°C. The sky is clear or mostly clear about 32% of the time across summer, and the air most often feels dry.
Summer is Locarno's best season of the year to visit on our travel score. For the whole year in context, see Locarno's year-round climate.
- Avg daytime high
- 20°C
- warmest season of the year
- Avg overnight low
- 10°C
- Precipitation
- 440 mm
- 43 wet days
- Avg wind
- 4 km/h
- Travel score
- 5.7
- best season of the year
- Months
- Jun · Jul · Aug
Temperature in Locarno in Summer
Across summer, daytime highs hold fairly steady around 20°C.
A typical summer day in Locarno reaches about 20°C and drops to 10°C overnight. The warmest of the three months is July, the coolest June.
How summer really feels in Locarno
Once humidity and wind are folded in, summer brings about 0 days that feel above 32°C and 0 that feel at or below 0°C.
summer sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Locarno weather by month
How the three summer months (June, July and August) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 1° / -6° | 75 | 9.5 | 9.9 | 8.8 | 0.0 |
| Feb | 3° / -5° | 63 | 8.8 | 8.9 | 10 | 0.0 |
| Mar | 6° / -2° | 91 | 10.9 | 7.4 | 11.6 | 0.7 |
| Apr | 10° / 1° | 143 | 13.1 | 5.8 | 13.3 | 2.0 |
| May | 14° / 6° | 162 | 16.2 | 2 | 14.7 | 3.7 |
| Jun | 18° / 9° | 155 | 15.5 | 0.5 | 15.5 | 5.2 |
| Jul | 21° / 11° | 128 | 14.2 | 0.2 | 15.2 | 5.9 |
| Aug | 20° / 11° | 158 | 13.6 | 0.1 | 14 | 5.9 |
| Sep | 16° / 8° | 178 | 12.9 | 0.6 | 12.3 | 4.6 |
| Oct | 11° / 4° | 187 | 13.9 | 2.8 | 10.7 | 2.5 |
| Nov | 5° / -1° | 177 | 12.1 | 7.6 | 9.2 | 0.4 |
| Dec | 2° / -5° | 87 | 10.5 | 9 | 8.5 | 0.0 |
Cloud cover in Summer
The sky is clear or mostly clear about 32% of the time across summer.
Chance of precipitation in Summer
Locarno gets around 440 mm of rain and snow over 43 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 4 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 15 h 18 min in early June to 13 h 12 min by late August. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 5.5 kWh/m².
Is summer a good time to visit Locarno?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is a reasonable time to visit Locarno for sightseeing.
What to pack for Locarno in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Locarno sees daytime highs around 20°C and nights near 10°C. Pack rain gear. Worth having: sun protection. About 43 days see rain.
UV index in Locarno in Summer
Clear-sky midday UV across summer averages around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Locarno peaks around July 16 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 1 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 1 | 2 | 4 | 6 | 7 | 7 | 8 | 7 | 5 | 3 | 2 | 1 |
| Level | Low | Moderate | Moderate | High | High | Very high | Very high | Very high | Moderate | Moderate | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 1 | Low |
| Feb | 2 | Moderate |
| Mar | 4 | Moderate |
| Apr | 6 | High |
| May | 7 | High |
| Jun | 7 | Very high |
| Jul | 8 | Very high |
| Aug | 7 | Very high |
| Sep | 5 | Moderate |
| Oct | 3 | Moderate |
| Nov | 2 | Low |
| Dec | 1 | Low |
Air quality in Locarno in Summer
Average fine-particle pollution (PM2.5) through the year — so you can see where summer falls, not just the annual average.
Air quality in Locarno is worst in June — around 16 µg/m³ PM2.5 (moderate), about 2.4× the cleanest month (November, 6 µg/m³).
Seasonal pattern from CAMS reanalysis, scaled to Locarno's WHO annual average of 10.5 µg/m³.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 9 | 9 | 13 | 14 | 12 | 16 | 13 | 11 | 9 | 8 | 6 | 7 |
| Level | Good | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 9 | Good |
| Feb | 9 | Good |
| Mar | 13 | Moderate |
| Apr | 14 | Moderate |
| May | 12 | Moderate |
| Jun | 16 | Moderate |
| Jul | 13 | Moderate |
| Aug | 11 | Good |
| Sep | 9 | Good |
| Oct | 8 | Good |
| Nov | 6 | Good |
| Dec | 7 | Good |
Where is Locarno?
Locarno sits at 46.2°N, 8.8°E, 206 m above sea level, in Switzerland. The nearest listed city is Bellinzona, 17 km away.
Topography around Locarno
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Locarno.
Within 3 km, the terrain around Locarno has very significant variations in elevation — a maximum elevation change of 1,412 m around an average of 433 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 2,216 m; within 80 km, extreme variations in elevation — a maximum elevation change of 4,405 m.
The land around Locarno is covered by trees (48%) and water (31%) within 3 km, trees (72%) within 16 km, and trees (48%) and grassland (27%) within 80 km.
Switzerland travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type C / J
- 230 V · 50 Hz
- Prices
- ≈ 112% of US
- price level, 2025
- GDP per capita
- $114,769
- 2025
- Happiness
- 7.0 / 10
- World Happiness, 2025
- Safe drinking water
- 97%
- of population, 2024
- Homicide rate
- 0.6
- per 100k, 2023
- Road deaths
- 2.2
- per 100k/yr, 2019
- Income group
- High
- World Bank
- English
- High
- EF EPI 564
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Locarno (46.1709°, 8.7995°, elevation 206 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.