Annual mean 12°C · wettest around December · prevailing wind W
Warmest
24.3 °C
Coldest
5.0 °C
Wettest
20%
Windiest
5.6 m/s
Prevailing
W
4.3 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 Guyancourt over the whole year is 12°C. July is the hottest month, with highs of about 24°C; January is the coldest, with lows of about 4°C. Guyancourt has no sharply defined rainy season: the chance of rain on a given day runs from 6% in July, the driest month, to 14% in December, the wettest. Winds in Guyancourt are highest in February, averaging 4.0 m/s (14 km/h), and lightest in September, at 2.9 m/s (10 km/h). The prevailing wind is from the W. The clearest skies in Guyancourt come in April, when the sky is typically 76% covered; December is the cloudiest month, at 88%.
Month by month Guyancourt 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
13%
87%
3.8 m/s
0
0
15
February
8°C
4°C
3°C
11%
82%
4.0 m/s
1
0
30
March
11°C
5°C
6°C
12%
80%
3.9 m/s
6
0
47
April
14°C
7°C
10°C
8%
76%
3.4 m/s
23
1
70
May
18°C
11°C
15°C
10%
78%
3.3 m/s
53
5
81
June
22°C
15°C
20°C
9%
79%
3.0 m/s
76
23
65
July
24°C
17°C
22°C
6%
78%
3.1 m/s
81
26
59
August
24°C
16°C
22°C
7%
78%
3.1 m/s
78
31
54
September
20°C
13°C
18°C
9%
80%
2.9 m/s
71
13
73
October
16°C
10°C
13°C
12%
82%
3.2 m/s
37
1
84
November
10°C
6°C
6°C
12%
85%
3.5 m/s
2
0
47
December
7°C
5°C
3°C
14%
88%
3.8 m/s
0
0
24
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 Guyancourt weather by season
Year round, Guyancourt has days of about 6°C at their warmest in January, its coolest month, and 24°C in July, its warmest; the coolest hours of the day run from 4°C to 17°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 July. 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.
Guyancourt weather in winterDecember to February
High 7°CLow 4°CRain 13%
Winter in Guyancourt has typical daily highs of about 7°C and lows of about 4°C, with a 13% chance of rain on a given day.
Guyancourt weather in springMarch to May
High 14°CLow 8°CRain 10%
Spring in Guyancourt has typical daily highs of about 14°C and lows of about 8°C, with a 10% chance of rain on a given day.
Guyancourt weather in summerJune to August
High 23°CLow 16°CRain 7%
Summer in Guyancourt has typical daily highs of about 23°C and lows of about 16°C, with a 7% chance of rain on a given day.
Guyancourt weather in autumnSeptember to November
High 15°CLow 10°CRain 11%
Autumn in Guyancourt has typical daily highs of about 15°C and lows of about 10°C, with a 11% chance of rain on a given day.
When is the rainy season in Guyancourt?
Guyancourt has no sharply defined rainy season: the chance of rain on a given day runs from 6% in July, the driest month, to 14% in December, the wettest.
What time of year is Guyancourt windiest?
Winds in Guyancourt are highest in February, averaging 4.0 m/s (14 km/h), and lightest in September, at 2.9 m/s (10 km/h). The prevailing wind is from the W.
What is the average temperature in Guyancourt year round?
The average temperature in Guyancourt over the whole year is 12°C. July is the hottest month, with highs of about 24°C; January is the coldest, with lows of about 4°C.