Spa in Summer
In summer (June, July and August), Spa sees average daytime highs around 21°C and overnight lows near 12°C, with 262 mm of rain over about 42 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 21°C. The sky is clear or mostly clear about 18% of the time across summer, and the air most often feels dry.
Summer is Spa's best season of the year to visit on our travel score. For the whole year in context, see Spa's year-round climate.
- Avg daytime high
- 21°C
- warmest season of the year
- Avg overnight low
- 12°C
- Rainfall
- 262 mm
- 42 wet days
- Avg wind
- 12 km/h
- Travel score
- 5.8
- best season of the year
- Months
- Jun · Jul · Aug
Temperature in Spa in Summer
Across summer, daytime highs hold fairly steady around 21°C.
A typical summer day in Spa reaches about 21°C and drops to 12°C overnight. The warmest of the three months is July, the coolest June.
How summer really feels in Spa
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.
Spa 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 | 4° / 0° | 98 | 14.9 | 4.5 | 8.3 | 0.0 |
| Feb | 5° / 0° | 87 | 13.7 | 5.4 | 9.7 | 0.1 |
| Mar | 9° / 2° | 87 | 15.1 | 3.6 | 11.5 | 1.5 |
| Apr | 13° / 5° | 63 | 12.6 | 0.6 | 13.5 | 3.3 |
| May | 17° / 8° | 74 | 14 | 0 | 15.2 | 4.7 |
| Jun | 20° / 11° | 84 | 13.7 | 0 | 16.1 | 5.5 |
| Jul | 22° / 13° | 89 | 14.6 | 0 | 15.8 | 5.9 |
| Aug | 21° / 13° | 89 | 13.6 | 0 | 14.3 | 5.9 |
| Sep | 18° / 10° | 74 | 11.9 | 0 | 12.4 | 5.2 |
| Oct | 13° / 7° | 76 | 13.2 | 0 | 10.4 | 3.4 |
| Nov | 8° / 4° | 82 | 14.4 | 1.7 | 8.7 | 1.2 |
| Dec | 5° / 1° | 103 | 15.8 | 4.8 | 7.9 | 0.0 |
Cloud cover in Summer
The sky is clear or mostly clear about 18% of the time across summer.
Chance of precipitation in Summer
Spa gets around 262 mm of rain over 42 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 12 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 15 h 54 min in early June to 13 h 24 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 4.9 kWh/m².
Is summer a good time to visit Spa?
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 Spa for sightseeing.
What to pack for Spa in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Spa sees daytime highs around 21°C and nights near 12°C. Pack rain gear. Worth having: sun protection. About 42 days see rain.
UV index in Spa in Summer
Clear-sky midday UV across summer averages around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Spa peaks around July 16 at about 7 (high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near January 1 at about 1 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 7 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 1 | 1 | 3 | 4 | 6 | 6 | 7 | 6 | 4 | 3 | 1 | 1 |
| Level | Low | Low | Moderate | Moderate | High | High | High | High | Moderate | Moderate | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 1 | Low |
| Feb | 1 | Low |
| Mar | 3 | Moderate |
| Apr | 4 | Moderate |
| May | 6 | High |
| Jun | 6 | High |
| Jul | 7 | High |
| Aug | 6 | High |
| Sep | 4 | Moderate |
| Oct | 3 | Moderate |
| Nov | 1 | Low |
| Dec | 1 | Low |
Air quality in Spa 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 Spa is worst in April — around 18 µg/m³ PM2.5 (moderate), about 1.7× the cleanest month (November, 11 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 14 | 13 | 17 | 18 | 15 | 14 | 13 | 14 | 13 | 12 | 11 | 11 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 14 | Moderate |
| Feb | 13 | Moderate |
| Mar | 17 | Moderate |
| Apr | 18 | Moderate |
| May | 15 | Moderate |
| Jun | 14 | Moderate |
| Jul | 13 | Moderate |
| Aug | 14 | Moderate |
| Sep | 13 | Moderate |
| Oct | 12 | Good |
| Nov | 11 | Good |
| Dec | 11 | Good |
Where is Spa?
Spa sits at 50.5°N, 5.9°E, 0 m above sea level, in Belgium. The nearest listed city is Heusy, 10 km away.
Topography around Spa
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Spa.
Within 3 km, the terrain around Spa has significant variations in elevation — a maximum elevation change of 353 m around an average of 369 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 615 m; within 80 km, large variations in elevation — a maximum elevation change of 1,001 m.
The land around Spa is covered by trees (79%) within 3 km, trees (61%) and grassland (33%) within 16 km, and trees (43%), grassland (26%) and cropland (24%) within 80 km.
Belgium travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type C / E
- 230 V · 50 Hz
- Prices
- ≈ 81% of US
- price level, 2025
- GDP per capita
- $60,750
- 2025
- Happiness
- 6.9 / 10
- World Happiness, 2025
- Safe drinking water
- 100%
- of population, 2024
- Homicide rate
- 1.1
- per 100k, 2021
- Road deaths
- 5.8
- per 100k/yr, 2019
- Income group
- High
- World Bank
- English
- Very high
- EF EPI 608
- 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 Spa (50.4838°, 5.8667°, elevation 0 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.