Fri
Apr 19
Stable
~6
l/m2
78%
Sat
Apr 20
Stable
~2
l/m2
52%
Sun
Apr 21
Stable
~4
l/m2
78%
2-4 cm snow
34 / 52 km/h
Sun Apr 21
Mon
Apr 22
Extremely stable
~0.2
l/m2
7%
Tue
Apr 23
Very stable
~18
l/m2
88%
10-18 cm snow
16 / 23 km/h
Tue Apr 23
Wed
Apr 24
Stable
14-31 cm snow
15 / 22 km/h
Wed Apr 24
Thu
Apr 25
Stable
~26
l/m2
97%
1-3 cm snow
22 / 39 km/h
Thu Apr 25
19 Apr will be cool and the weather will be very stable.
There is a 78% probability of moderate rainfall.
The sky will be overcast:
61% high clouds (above 6,000 meters: Cirrus, Cirrus uncinus, Cirrostratus, Cirrocumulus)
63% middle clouds (from 2,000 to 6,000 meters: Altostratus, Altocumulus)
95% low clouds (below 2,000 meters: Cumulus, Stratocumulus, Stratus, Fractostratus)
1% convective clouds (Cumulonimbus)
The highest temperature will reach 8 degrees Celsius, while the the lowest temperature will drop to 5 degrees Celsius. The wind will be a fresh breeze, fog will form, and the mean air pressure will be 1008 mb. Relative humidity will be very high.
Friday
Weather
Precipitation mm probability
Showers (% of Precipitation)
Temperature °C
Felt temperature °C
Temperature low | high °C
Wind speed
Wind gusts
Atmospheric pressure
Relative humidity
Isotherm 0°C
Boundary Layer
Heat index
11:00
5 °C
2 °C
12 km/h 
24 km/h
1015 mb
78.2%
1,844 m
239 m
Apr, 19 11:00 @ Very stable
14:00
6 °C
3 °C
18 km/h 
31 km/h
1011 mb
74.7%
1,890 m
269 m
Apr, 19 14:00 @ Very stable
17:00
1.1 58%
5 °C
2 °C
16 km/h
30 km/h
1008 mb
79.0%
2,272 m
256 m
Apr, 19 17:00 @ Stable
20:00
3.9 78%
6 °C
2 °C
20 km/h
39 km/h
1005 mb
87.6%
1,979 m
375 m
Apr, 19 20:00 @ Stable
23:00
1.2 61%
7 °C
3 °C
31 km/h
53 km/h
1002 mb
86.4%
1,747 m
405 m
Apr, 19 23:00 @ Stable
20 Apr will be cool and the weather will be very stable.
There is a 52% probability of light rainfall and showers.
The sky will be mostly cloudy:
11% high clouds (above 6,000 meters: Cirrus, Cirrus uncinus, Cirrostratus, Cirrocumulus)
35% middle clouds (from 2,000 to 6,000 meters: Altostratus, Altocumulus)
74% low clouds (below 2,000 meters: Cumulus, Stratocumulus, Stratus, Fractostratus)
3% convective clouds (Cumulonimbus)
The highest temperature will reach 5 degrees Celsius, while the the lowest temperature will drop to 1 degrees Celsius. The wind will be a moderate breeze, fog will form, and the mean air pressure will be 1005 mb. Relative humidity will be high.
Saturday
Weather
Precipitation mm probability
Showers (% of Precipitation)
Temperature °C
Felt temperature °C
Temperature low | high °C
Wind speed
Wind gusts
Atmospheric pressure
Relative humidity
Isotherm 0°C
Boundary Layer
Heat index
02:00
1.5 52%
14%
5 °C
1 °C
24 km/h
41 km/h
1004 mb
81.8%
1,092 m
327 m
Apr, 20 02:00 @ Very stable
05:00
0.2 30%
42%
2 °C
-3 °C
24 km/h
38 km/h
1006 mb
85.0%
630 m
302 m
Apr, 20 05:00 @ Extremely stable
08:00
0.2 15%
42%
3 °C
-3 °C
26 km/h
42 km/h
1007 mb
76.6%
532 m
432 m
Apr, 20 08:00 @ Very stable
11:00
4 °C
-2 °C
25 km/h
36 km/h
1006 mb
63.3%
676 m
560 m
Apr, 20 11:00 @ Stable
14:00
4 °C
0 °C
23 km/h 
31 km/h
1005 mb
58.7%
809 m
576 m
Apr, 20 14:00 @ Stable
17:00
4 °C
-1 °C
21 km/h
30 km/h
1005 mb
61.9%
865 m
513 m
Apr, 20 17:00 @ Mostly stable
20:00
3 °C
-2 °C
16 km/h
23 km/h
1006 mb
71.1%
830 m
120 m
Apr, 20 20:00 @ Mostly stable
23:00
2 °C
-3 °C
17 km/h
30 km/h
1006 mb
78.1%
707 m
186 m
Apr, 20 23:00 @ Stable
21 Apr will be cool and the weather will be very stable.
There is a 78% probability of light rainfall, moderate snowfall and showers.
The sky will be overcast:
1% high clouds (above 6,000 meters: Cirrus, Cirrus uncinus, Cirrostratus, Cirrocumulus)
75% middle clouds (from 2,000 to 6,000 meters: Altostratus, Altocumulus)
80% low clouds (below 2,000 meters: Cumulus, Stratocumulus, Stratus, Fractostratus)
4% convective clouds (Cumulonimbus)
The highest temperature will reach 5 degrees Celsius, while the the lowest temperature will drop to -6 degrees Celsius. The wind will be a fresh breeze, and the mean air pressure will be 1005 mb. Relative humidity will be high.
Sunday
Weather
Precipitation mm probability
Showers (% of Precipitation)
Temperature °C
Felt temperature °C
Temperature low | high °C
Wind speed
Wind gusts
Atmospheric pressure
Relative humidity
Isotherm 0°C
Boundary Layer
Heat index
02:00
1 °C
-4 °C
15 km/h
24 km/h
1006 mb
84.9%
494 m
135 m
Apr, 21 02:00 @ Very stable
05:00
0 °C
-4 °C
13 km/h
21 km/h
1006 mb
85.5%
378 m
184 m
Apr, 21 05:00 @ Very stable
08:00
1 °C
-3 °C
14 km/h
21 km/h
1007 mb
76.6%
382 m
354 m
Apr, 21 08:00 @ Very stable
11:00
2 °C
-2 °C
15 km/h
22 km/h
1005 mb
63.5%
582 m
555 m
Apr, 21 11:00 @ Stable
14:00
0.2 29%
100%
4 °C
-1 °C
20 km/h
28 km/h
1003 mb
58.2%
772 m
640 m
Apr, 21 14:00 @ Stable
17:00
5 °C
1 °C
21 km/h
30 km/h
1000 mb
54.5%
936 m
642 m
Apr, 21 17:00 @ Mostly stable
20:00
3.9 78%
8%
-2 °C
-9 °C
33 km/h 
52 km/h
1004 mb
85.0%
18 m
767 m
Apr, 21 20:00 @ Stable
23:00
0.2 24%
44%
-5 °C
-14 °C
34 km/h
41 km/h
1009 mb
71.8%
0 m
1,172 m
Apr, 21 23:00 @ Extremely stable
22 Apr will be cold and the weather will be very stable.
There is a 7% probability of light snowfall.
The sky will be cloudy:
2% middle clouds (from 2,000 to 6,000 meters: Altostratus, Altocumulus)
57% low clouds (below 2,000 meters: Cumulus, Stratocumulus, Stratus, Fractostratus)
1% convective clouds (Cumulonimbus)
The highest temperature will reach -4 degrees Celsius, while the the lowest temperature will drop to -12 degrees Celsius. The wind will be a fresh breeze, and the mean air pressure will be 1016 mb. Relative humidity will be high.
Monday
Weather
Precipitation mm probability
Showers (% of Precipitation)
Temperature °C
Felt temperature °C
Temperature low | high °C
Wind speed
Wind gusts
Atmospheric pressure
Relative humidity
Isotherm 0°C
Boundary Layer
Heat index
02:00
0.2 7%
45%
-9 °C
-19 °C
36 km/h
51 km/h
1011 mb
63.9%
0 m
1,850 m
Apr, 22 02:00 @ Extremely stable
05:00
-11 °C
-23 °C
35 km/h
47 km/h
1015 mb
60.8%
0 m
1,710 m
Apr, 22 05:00 @ Extremely stable
08:00
-12 °C
-22 °C
32 km/h
41 km/h
1017 mb
57.2%
0 m
1,758 m
Apr, 22 08:00 @ Extremely stable
11:00
-9 °C
-18 °C
31 km/h
44 km/h
1016 mb
46.8%
0 m
2,212 m
Apr, 22 11:00 @ Extremely stable
14:00
-6 °C
-15 °C
34 km/h
49 km/h
1016 mb
45.5%
0 m
2,399 m
Apr, 22 14:00 @ Extremely stable
17:00
-5 °C
-13 °C
29 km/h
46 km/h
1017 mb
49.8%
0 m
2,162 m
Apr, 22 17:00 @ Extremely stable
20:00
-6 °C
-12 °C
15 km/h
26 km/h
1018 mb
62.1%
0 m
303 m
Apr, 22 20:00 @ Extremely stable
23:00
-8 °C
-11 °C
5 km/h 
8 km/h
1019 mb
71.2%
0 m
185 m
Apr, 22 23:00 @ Extremely stable
23 Apr will be cool and the weather will be very stable.
There is a 88% probability of moderate sleet and snowfall, moderate snowfall.
The sky will be overcast:
62% high clouds (above 6,000 meters: Cirrus, Cirrus uncinus, Cirrostratus, Cirrocumulus)
96% middle clouds (from 2,000 to 6,000 meters: Altostratus, Altocumulus)
96% low clouds (below 2,000 meters: Cumulus, Stratocumulus, Stratus, Fractostratus)
The highest temperature will reach 1 degrees Celsius, while the the lowest temperature will drop to -8 degrees Celsius. The wind will be a gentle breeze, fog will form, and the mean air pressure will be 1015 mb. Relative humidity will be very high.
Tuesday
Weather
Precipitation mm probability
Showers (% of Precipitation)
Temperature °C
Felt temperature °C
Temperature low | high °C
Wind speed
Wind gusts
Atmospheric pressure
Relative humidity
Isotherm 0°C
Boundary Layer
Heat index
02:00
-7 °C
-10 °C
6 km/h
6 km/h
1019 mb
69.9%
0 m
256 m
Apr, 23 02:00 @ Extremely stable
05:00
-7 °C
-11 °C
9 km/h 
10 km/h
1019 mb
80.6%
0 m
214 m
Apr, 23 05:00 @ Extremely stable
08:00
-6 °C
-12 °C
13 km/h
16 km/h
1019 mb
83.1%
0 m
344 m
Apr, 23 08:00 @ Extremely stable
11:00
1.9 67%
-4 °C
-10 °C
16 km/h
20 km/h
1017 mb
92.2%
12 m
419 m
Apr, 23 11:00 @ Extremely stable
14:00
3.4 76%
-2 °C
-6 °C
12 km/h
17 km/h
1015 mb
93.7%
53 m
373 m
Apr, 23 14:00 @ Very stable
17:00
2 69%
0 °C
-5 °C
13 km/h
23 km/h
1013 mb
98.1%
184 m
298 m
Apr, 23 17:00 @ Stable
20:00
5.3 88%
0 °C
-4 °C
11 km/h 
18 km/h
1010 mb
98.7%
187 m
190 m
Apr, 23 20:00 @ Stable
23:00
5.3 88%
0 °C
-5 °C
14 km/h
20 km/h
1009 mb
98.5%
185 m
203 m
Apr, 23 23:00 @ Stable
24 Apr will be cool and the weather will be stable, thunderstorms not likely.
There is a 98% probability of moderate rainfall, moderate sleet and snowfall, moderate snowfall.
The sky will be overcast:
66% high clouds (above 6,000 meters: Cirrus, Cirrus uncinus, Cirrostratus, Cirrocumulus)
80% middle clouds (from 2,000 to 6,000 meters: Altostratus, Altocumulus)
99% low clouds (below 2,000 meters: Cumulus, Stratocumulus, Stratus, Fractostratus)
The highest temperature will reach 2 degrees Celsius, while the the lowest temperature will drop to -1 degrees Celsius. The wind will be a gentle breeze, fog will form, and the mean air pressure will be 1012 mb. Relative humidity will be very high.
Wednesday
Weather
Precipitation mm probability
Showers (% of Precipitation)
Temperature °C
Felt temperature °C
Temperature low | high °C
Wind speed
Wind gusts
Atmospheric pressure
Relative humidity
Isotherm 0°C
Boundary Layer
Heat index
02:00
8.4 97%
0 °C
-5 °C
15 km/h
22 km/h
1010 mb
97.4%
158 m
186 m
Apr, 24 02:00 @ Stable
05:00
1.7 63%
-1 °C
-5 °C
13 km/h
20 km/h
1011 mb
97.1%
138 m
156 m
Apr, 24 05:00 @ Mostly stable
08:00
2.1 64%
0 °C
-5 °C
11 km/h
15 km/h
1013 mb
96.5%
150 m
172 m
Apr, 24 08:00 @ Stable
11:00
0.6 59%
0 °C
-2 °C
5 km/h
8 km/h
1014 mb
98.0%
210 m
105 m
Apr, 24 11:00 @ Stable
14:00
2.8 74%
0 °C
-2 °C
7 km/h
11 km/h
1014 mb
99.1%
722 m
97 m
Apr, 24 14:00 @ Stable
17:00
4.9 86%
1 °C
-2 °C
6 km/h
10 km/h
1014 mb
99.4%
994 m
93 m
Apr, 24 17:00 @ Very stable
20:00
9.6 98%
1 °C
-2 °C
9 km/h
12 km/h
1014 mb
99.6%
1,235 m
70 m
Apr, 24 20:00 @ Stable
23:00
3 75%
1 °C
-2 °C
11 km/h
20 km/h
1013 mb
98.9%
1,333 m
123 m
Apr, 24 23:00 @ Stable
25 Apr will be cool and the weather will be very stable.
There is a 97% probability of moderate rainfall, light sleet and snowfall.
The sky will be overcast:
46% high clouds (above 6,000 meters: Cirrus, Cirrus uncinus, Cirrostratus, Cirrocumulus)
79% middle clouds (from 2,000 to 6,000 meters: Altostratus, Altocumulus)
99% low clouds (below 2,000 meters: Cumulus, Stratocumulus, Stratus, Fractostratus)
The highest temperature will reach 2 degrees Celsius, while the the lowest temperature will drop to 0 degrees Celsius. The wind will be a moderate breeze, fog will form, and the mean air pressure will be 1011 mb. Relative humidity will be very high.
Thursday
Weather
Precipitation mm probability
Showers (% of Precipitation)
Temperature °C
Felt temperature °C
Temperature low | high °C
Wind speed
Wind gusts
Atmospheric pressure
Relative humidity
Isotherm 0°C
Boundary Layer
Heat index
02:00
5.7 91%
1 °C
-1 °C
7 km/h
17 km/h
1013 mb
99.1%
1,379 m
142 m
Apr, 25 02:00 @ Stable
05:00
2 69%
1 °C
-3 °C
13 km/h
23 km/h
1011 mb
98.4%
1,204 m
163 m
Apr, 25 05:00 @ Stable
08:00
7 97%
2 °C
-3 °C
22 km/h
39 km/h
1011 mb
96.8%
674 m
296 m
Apr, 25 08:00 @ Very stable
11:00
3.2 73%
2 °C
-3 °C
17 km/h
28 km/h
1011 mb
97.7%
728 m
199 m
Apr, 25 11:00 @ Very stable
14:00
5 86%
2 °C
-3 °C
18 km/h
31 km/h
1011 mb
97.8%
699 m
223 m
Apr, 25 14:00 @ Very stable
17:00
0.7 59%
1 °C
-3 °C
13 km/h
22 km/h
1011 mb
96.8%
553 m
190 m
Apr, 25 17:00 @ Very stable
20:00
1.5 67%
1 °C
-5 °C
20 km/h
33 km/h
1012 mb
98.6%
375 m
322 m
Apr, 25 20:00 @ Stable
23:00
0.8 63%
0 °C
-5 °C
18 km/h
30 km/h
1012 mb
98.6%
193 m
277 m
Apr, 25 23:00 @ Stable
26 Apr will be cool and the weather will be .
There is a 73% probability of light rainfall, moderate sleet and snowfall, light snowfall.
The sky will be :
199% middle clouds (from 2,000 to 6,000 meters: Altostratus, Altocumulus)
599% low clouds (below 2,000 meters: Cumulus, Stratocumulus, Stratus, Fractostratus)
16% convective clouds (Cumulonimbus)
The highest temperature will reach 3 degrees Celsius, while the the lowest temperature will drop to -1 degrees Celsius. The wind will be a gentle breeze, fog will form, and the mean air pressure will be 6073 mb. Relative humidity will be .
Friday
Weather
Precipitation mm probability
Showers (% of Precipitation)
Temperature °C
Felt temperature °C
Temperature low | high °C
Wind speed
Wind gusts
Atmospheric pressure
Relative humidity
Isotherm 0°C
Boundary Layer
Heat index
02:00
2.1 70%
0 °C
-5 °C
15 km/h
28 km/h
1012 mb
99.2%
164 m
258 m
Apr, 26 02:00 @ Very stable
05:00
1.1 65%
0 °C
-4 °C
12 km/h
22 km/h
1012 mb
99.4%
231 m
212 m
Apr, 26 05:00 @ Very stable
08:00
2.5 73%
0 °C
-5 °C
17 km/h
29 km/h
1013 mb
99.4%
350 m
277 m
Apr, 26 08:00 @ Very stable
11:00
1.5 67%
1 °C
-4 °C
19 km/h
32 km/h
1013 mb
99.3%
449 m
269 m
Apr, 26 11:00 @ Very stable
14:00
1.9 68%
6%
2 °C
-3 °C
16 km/h
26 km/h
1013 mb
93.9%
654 m
189 m
Apr, 26 14:00 @ Very stable
17:00
2 °C
-3 °C
17 km/h
27 km/h
1014 mb
91.7%
725 m
209 m
Apr, 26 17:00 @ Very stable
Rivière à Grignon
20:00 
