Hillegom in Summer
In summer (June, July and August), Hillegom sees average daytime highs around 19°C and overnight lows near 14°C, with 228 mm of rain over about 37 wet days across the season. It is the warmest season of the year and the 2nd-wettest season.
Over the season highs climb from about 17°C in early June to 19°C by late August. The sky is clear or mostly clear about 23% of the time across summer, and the air most often feels dry.
Summer is Hillegom's best season of the year to visit on our travel score. For the whole year in context, see Hillegom's year-round climate.
- Avg daytime high
- 19°C
- warmest season of the year
- Avg overnight low
- 14°C
- Rainfall
- 228 mm
- 37 wet days
- Avg wind
- 17 km/h
- Travel score
- 5.8
- best season of the year
- Months
- Jun · Jul · Aug
Temperature in Hillegom in Summer
Over the season highs climb from about 17°C in early June to 19°C by late August.
A typical summer day in Hillegom reaches about 19°C and drops to 14°C overnight. The warmest of the three months is August, the coolest June.
How summer really feels in Hillegom
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.
Hillegom 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 | 6° / 3° | 72 | 13.6 | 0.9 | 8 | 0.4 |
| Feb | 6° / 3° | 56 | 11.5 | 1.4 | 9.5 | 0.5 |
| Mar | 9° / 4° | 54 | 11.3 | 0.4 | 11.5 | 1.5 |
| Apr | 12° / 7° | 45 | 10.1 | 0 | 13.6 | 3.0 |
| May | 15° / 10° | 59 | 10.4 | 0 | 15.4 | 4.5 |
| Jun | 18° / 13° | 61 | 11 | 0 | 16.4 | 5.5 |
| Jul | 20° / 15° | 77 | 12.4 | 0 | 16 | 6.0 |
| Aug | 20° / 15° | 90 | 13.3 | 0 | 14.5 | 5.9 |
| Sep | 18° / 13° | 87 | 13 | 0 | 12.4 | 5.2 |
| Oct | 14° / 10° | 93 | 14 | 0 | 10.3 | 3.6 |
| Nov | 10° / 7° | 83 | 15.3 | 0.3 | 8.5 | 1.9 |
| Dec | 7° / 4° | 84 | 14.6 | 0.8 | 7.5 | 0.7 |
Cloud cover in Summer
The sky is clear or mostly clear about 23% of the time across summer.
Chance of precipitation in Summer
Hillegom gets around 228 mm of rain over 37 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 17 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 16 h 12 min in early June to 13 h 30 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 5.3 kWh/m².
Is summer a good time to visit Hillegom?
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 Hillegom for sightseeing.
What to pack for Hillegom in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Hillegom sees daytime highs around 19°C and nights near 14°C. Worth packing: rain gear and sun protection. About 37 days see rain.
Sea temperature near Hillegom in Summer
The nearest coast averages about 17°C across summer — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 17 km away) is warmest in August at about 19°C and coldest in February near 6°C.
The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 6 | 6 | 6 | 8 | 12 | 15 | 17 | 19 | 18 | 15 | 11 | 8 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Cool | Cool | Cool | Bracing | Bracing | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 6 | Bracing |
| Feb | 6 | Bracing |
| Mar | 6 | Bracing |
| Apr | 8 | Bracing |
| May | 12 | Bracing |
| Jun | 15 | Bracing |
| Jul | 17 | Cool |
| Aug | 19 | Cool |
| Sep | 18 | Cool |
| Oct | 15 | Bracing |
| Nov | 11 | Bracing |
| Dec | 8 | Bracing |
UV index in Hillegom in Summer
Clear-sky midday UV across summer averages around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Hillegom peaks around June 23 at about 6 (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 6 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 1 | 1 | 3 | 3 | 5 | 6 | 6 | 6 | 4 | 2 | 1 | 1 |
| Level | Low | Low | Moderate | Moderate | Moderate | High | High | High | Moderate | Moderate | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 1 | Low |
| Feb | 1 | Low |
| Mar | 3 | Moderate |
| Apr | 3 | Moderate |
| May | 5 | Moderate |
| Jun | 6 | High |
| Jul | 6 | High |
| Aug | 6 | High |
| Sep | 4 | Moderate |
| Oct | 2 | Moderate |
| Nov | 1 | Low |
| Dec | 1 | Low |
Where is Hillegom?
Hillegom sits at 52.3°N, 4.6°E, 0 m above sea level, in The Netherlands. The nearest listed city is Lisse, 4.0 km away.
Topography around Hillegom
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Hillegom.
Within 3 km, the terrain around Hillegom has only modest variations in elevation — a maximum elevation change of 26 m around an average of -1 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 67 m; within 80 km, only modest variations in elevation — a maximum elevation change of 99 m.
The land around Hillegom is covered by cropland (41%), artificial surfaces (23%) and grassland (21%) within 3 km, grassland (27%) and water (25%) within 16 km, and water (38%) and grassland (27%) within 80 km.
The Netherlands travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type C / F
- 230 V · 50 Hz
- Prices
- ≈ 84% of US
- price level, 2025
- GDP per capita
- $73,684
- 2025
- Happiness
- 7.2 / 10
- World Happiness, 2025
- Safe drinking water
- 100%
- of population, 2024
- Homicide rate
- 0.7
- per 100k, 2023
- Road deaths
- 4
- per 100k/yr, 2019
- Income group
- High
- World Bank
- English
- Very high
- EF EPI 624
- 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 Hillegom (52.2908°, 4.5833°, 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.