Annual mean 12°C · wettest around December · prevailing wind SW
Warmest
22.4 °C
Coldest
5.0 °C
Wettest
38%
Windiest
6.4 m/s
Prevailing
SW
5.4 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
never good
never good
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in Rotterdam over the whole year is 12°C. August is the hottest month, with highs of about 22°C; January is the coldest, with lows of about 4°C. Rotterdam has no sharply defined rainy season: the chance of rain on a given day runs from 18% in May, the driest month, to 35% in December, the wettest. Winds in Rotterdam are highest in February, averaging 5.5 m/s (20 km/h), and lightest in September, at 3.7 m/s (13 km/h). The prevailing wind is from the SW. The clearest skies in Rotterdam come in June, when the sky is typically 38% covered; December is the cloudiest month, at 69%.
Month by month Rotterdam climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
6°C
4°C
1°C
33%
68%
5.2 m/s
0
0
7
February
7°C
4°C
2°C
29%
57%
5.5 m/s
1
0
17
March
10°C
5°C
4°C
25%
48%
4.7 m/s
3
0
32
April
13°C
7°C
8°C
21%
38%
4.3 m/s
13
0
58
May
17°C
11°C
13°C
18%
39%
4.1 m/s
42
3
78
June
21°C
15°C
18°C
18%
38%
4.1 m/s
71
14
72
July
22°C
16°C
19°C
19%
41%
4.0 m/s
75
12
69
August
22°C
16°C
20°C
19%
38%
3.8 m/s
76
18
66
September
19°C
14°C
17°C
24%
42%
3.7 m/s
63
8
74
October
15°C
11°C
11°C
30%
52%
4.4 m/s
23
0
74
November
10°C
7°C
5°C
33%
59%
4.5 m/s
1
0
38
December
7°C
5°C
2°C
35%
69%
5.1 m/s
0
0
16
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Rotterdam weather by season
Year round, Rotterdam has days of about 6°C at their warmest in January, its coolest month, and 22°C in August, its warmest; the coolest hours of the day run from 4°C to 16°C through the year, and the average temperature over the year is 12°C around the clock. Rain is most likely around December and least likely around May. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Rotterdam weather in winterDecember to February
High 7°CLow 4°CRain 32%
Winter in Rotterdam has typical daily highs of about 7°C and lows of about 4°C, with a 32% chance of rain on a given day.
Rotterdam weather in springMarch to May
High 13°CLow 8°CRain 21%
Spring in Rotterdam has typical daily highs of about 13°C and lows of about 8°C, with a 21% chance of rain on a given day.
Rotterdam weather in summerJune to August
High 21°CLow 16°CRain 19%
Summer in Rotterdam has typical daily highs of about 21°C and lows of about 16°C, with a 19% chance of rain on a given day.
Rotterdam weather in autumnSeptember to November
High 15°CLow 10°CRain 29%
Autumn in Rotterdam has typical daily highs of about 15°C and lows of about 10°C, with a 29% chance of rain on a given day.
When is the rainy season in Rotterdam?
Rotterdam has no sharply defined rainy season: the chance of rain on a given day runs from 18% in May, the driest month, to 35% in December, the wettest.
What time of year is Rotterdam windiest?
Winds in Rotterdam are highest in February, averaging 5.5 m/s (20 km/h), and lightest in September, at 3.7 m/s (13 km/h). The prevailing wind is from the SW.
What is the average temperature in Rotterdam year round?
The average temperature in Rotterdam over the whole year is 12°C. August is the hottest month, with highs of about 22°C; January is the coldest, with lows of about 4°C.