Rotterdam in Summer
In summer (June, July and August), Rotterdam sees average daytime highs around 78°F and overnight lows near 60°F, with 13.5 in of rain over about 36 wet days across the season. It is the warmest season of the year and the wettest season of the year.
Over the season highs climb from about 73°F in early June to 77°F by late August. The sky is clear or mostly clear about 27% of the time across summer, and the air most often feels humid.
Summer is Rotterdam's best season of the year to visit on our travel score. For the whole year in context, see Rotterdam's year-round climate.
- Avg daytime high
- 78°F
- warmest season of the year
- Avg overnight low
- 60°F
- Rainfall
- 13.5 in
- 36 wet days
- Avg wind
- 5 mph
- Travel score
- 6.4
- best season of the year
- Months
- Jun · Jul · Aug
Temperature in Rotterdam in Summer
Over the season highs climb from about 73°F in early June to 77°F by late August.
A typical summer day in Rotterdam reaches about 78°F and drops to 60°F overnight. The warmest of the three months is July, the coolest June.
How summer really feels in Rotterdam
Once humidity and wind are folded in, summer brings about 0 days that feel above 90°F and 0 that feel at or below 32°F.
summer sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Rotterdam 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 (°F) | Rainfall (inches) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 31° / 17° | 3.0 | 9.8 | 7.1 | 9.2 | 0.0 |
| Feb | 34° / 18° | 2.8 | 9 | 6.6 | 10.3 | 0.0 |
| Mar | 43° / 26° | 3.8 | 11.2 | 5.3 | 11.6 | 0.6 |
| Apr | 56° / 38° | 4.1 | 12 | 1.7 | 13.1 | 3.7 |
| May | 67° / 48° | 4.1 | 12.5 | 0.1 | 14.4 | 5.8 |
| Jun | 76° / 57° | 4.8 | 12.8 | 0 | 15.1 | 6.3 |
| Jul | 80° / 62° | 4.4 | 12 | 0 | 14.8 | 6.2 |
| Aug | 79° / 60° | 4.2 | 11.5 | 0 | 13.7 | 6.6 |
| Sep | 72° / 53° | 4.2 | 9.6 | 0 | 12.3 | 6.7 |
| Oct | 59° / 42° | 4.5 | 10.8 | 0.4 | 10.8 | 4.5 |
| Nov | 47° / 32° | 3.3 | 9.8 | 2.1 | 9.6 | 1.5 |
| Dec | 36° / 23° | 3.8 | 10.8 | 6.2 | 8.9 | 0.0 |
Cloud cover in Summer
The sky is clear or mostly clear about 27% of the time across summer.
Chance of precipitation in Summer
Rotterdam gets around 13.5 in of rain over 36 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels humid — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 5 mph across summer.
Sunrise & sunset in Summer
Daylight runs from about 14 h 54 min in early June to 13 h 06 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 5.7 kWh/m².
Is summer a good time to visit Rotterdam?
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 Rotterdam for sightseeing.
What to pack for Rotterdam in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Rotterdam sees daytime highs around 78°F and nights near 60°F. Worth packing: light clothes, rain gear and sun protection. About 36 days see rain.
UV index in Rotterdam 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 Rotterdam peaks around July 12 at about 8 (very 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 8 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 1 | 2 | 4 | 5 | 7 | 7 | 8 | 5 | 6 | 3 | 2 | 1 |
| Level | Low | Moderate | Moderate | High | Very high | Very high | Very high | Moderate | High | Moderate | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 1 | Low |
| Feb | 2 | Moderate |
| Mar | 4 | Moderate |
| Apr | 5 | High |
| May | 7 | Very high |
| Jun | 7 | Very high |
| Jul | 8 | Very high |
| Aug | 5 | Moderate |
| Sep | 6 | High |
| Oct | 3 | Moderate |
| Nov | 2 | Moderate |
| Dec | 1 | Low |
Where is Rotterdam?
Rotterdam sits at 42.8°N, 74.0°W, 338 ft above sea level, in United States. The nearest listed city is Schenectady, 2.5 mi away.
Topography around Rotterdam
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Rotterdam.
Within 2 miles, the terrain around Rotterdam has only modest variations in elevation — a maximum elevation change of 220 ft around an average of 328 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,440 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 4,058 ft.
The land around Rotterdam is covered by trees (47%) and artificial surfaces (35%) within 2 miles, trees (72%) within 10 miles, and trees (83%) within 50 miles.
United States travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 100% of US
- price level, 2025
- GDP per capita
- $90,027
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 5.8
- per 100k, 2023
- Road deaths
- 12.7
- per 100k/yr, 2019
- Income group
- High
- World Bank
- 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 Rotterdam (42.787°, -73.971°, elevation 338 ft), 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.