Sat
Apr 27
Very stable
~12
l/m2
81%
Sun
Apr 28
Very stable
~8
l/m2
66%
Mon
Apr 29
Stable
~29
l/m2
97%
Tue
Apr 30
Mostly stable
~28
l/m2
98%
2-6 cm snow
6 / 15 km/h
Tue Apr 30
Thu
May 2
Very stable
~19
l/m2
95%
Fri
May 3
Very stable
~20
l/m2
98%
27 Apr will be cool and the weather will be very stable.
There is a 81% probability of moderate rainfall and showers.
The sky will be overcast:
68% high clouds (above 6,000 meters: Cirrus, Cirrus uncinus, Cirrostratus, Cirrocumulus)
73% middle clouds (from 2,000 to 6,000 meters: Altostratus, Altocumulus)
96% low clouds (below 2,000 meters: Cumulus, Stratocumulus, Stratus, Fractostratus)
22% 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 light breeze, fog will form, and the mean air pressure will be 1018 mb. Relative humidity will be very 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
08:00
0.7 59%
75%
6 °C
5 °C
7 km/h 
23 km/h
1018 mb
97.0%
1,188 m
543 m
Apr, 27 08:00 @ Extremely stable
11:00
1.5 65%
83%
7 °C
6 °C
7 km/h
20 km/h
1019 mb
89.1%
1,146 m
1,016 m
Apr, 27 11:00 @ Very stable
14:00
2.4 72%
16%
6 °C
5 °C
5 km/h
20 km/h
1019 mb
96.8%
1,254 m
999 m
Apr, 27 14:00 @ Very stable
17:00
4.1 81%
13%
6 °C
6 °C
4 km/h
23 km/h
1019 mb
97.5%
1,344 m
863 m
Apr, 27 17:00 @ Stable
20:00
1 61%
6 °C
6 °C
3 km/h 
16 km/h
1019 mb
98.2%
1,656 m
386 m
Apr, 27 20:00 @ Stable
23:00
1.6 67%
6%
6 °C
5 °C
6 km/h
21 km/h
1020 mb
98.2%
1,629 m
504 m
Apr, 27 23:00 @ Stable
28 Apr will be cool and the weather will be very stable.
There is a 66% probability of light rainfall and showers.
The sky will be overcast:
49% high clouds (above 6,000 meters: Cirrus, Cirrus uncinus, Cirrostratus, Cirrocumulus)
54% middle clouds (from 2,000 to 6,000 meters: Altostratus, Altocumulus)
92% low clouds (below 2,000 meters: Cumulus, Stratocumulus, Stratus, Fractostratus)
37% convective clouds (Cumulonimbus)
The highest temperature will reach 10 degrees Celsius, while the the lowest temperature will drop to 4 degrees Celsius. The wind will be a gentle breeze, fog will form, and the mean air pressure will be 1020 mb. Relative humidity will be very 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
0.4 58%
61%
6 °C
4 °C
9 km/h
13 km/h
1020 mb
99.0%
1,427 m
389 m
Apr, 28 02:00 @ Very stable
05:00
0.9 61%
76%
6 °C
4 °C
9 km/h
10 km/h
1020 mb
98.9%
1,314 m
226 m
Apr, 28 05:00 @ Very stable
08:00
0.4 53%
100%
7 °C
5 °C
9 km/h
12 km/h
1021 mb
93.9%
1,241 m
325 m
Apr, 28 08:00 @ Very stable
11:00
1.2 50%
99%
8 °C
6 °C
14 km/h
18 km/h
1021 mb
80.6%
1,229 m
1,146 m
Apr, 28 11:00 @ Extremely stable
14:00
1 59%
100%
9 °C
8 °C
12 km/h
20 km/h
1020 mb
73.0%
1,343 m
1,415 m
Apr, 28 14:00 @ Very stable
17:00
1.8 64%
100%
8 °C
6 °C
15 km/h
21 km/h
1020 mb
79.7%
1,280 m
1,075 m
Apr, 28 17:00 @ Very stable
20:00
0.9 62%
85%
6 °C
4 °C
7 km/h
12 km/h
1020 mb
92.2%
1,149 m
237 m
Apr, 28 20:00 @ Very stable
23:00
1.5 66%
86%
4 °C
3 °C
7 km/h
12 km/h
1020 mb
95.4%
1,036 m
261 m
Apr, 28 23:00 @ Very stable
29 Apr will be cool and the weather will be stable, thunderstorms not likely.
There is a 97% probability of moderate rainfall, light sleet and snowfall and showers.
The sky will be mostly cloudy:
70% middle clouds (from 2,000 to 6,000 meters: Altostratus, Altocumulus)
83% low clouds (below 2,000 meters: Cumulus, Stratocumulus, Stratus, Fractostratus)
27% convective clouds (Cumulonimbus)
The highest temperature will reach 7 degrees Celsius, while the the lowest temperature will drop to 0 degrees Celsius. The wind will be a gentle breeze, fog will form, and the mean air pressure will be 1019 mb. Relative humidity will be very 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
1.7 68%
11%
4 °C
2 °C
8 km/h 
24 km/h
1019 mb
98.7%
945 m
670 m
Apr, 29 02:00 @ Stable
05:00
6.3 94%
5%
3 °C
1 °C
8 km/h
11 km/h
1017 mb
99.2%
864 m
292 m
Apr, 29 05:00 @ Mostly stable
08:00
6.3 94%
2%
2 °C
-1 °C
9 km/h
10 km/h
1019 mb
98.6%
664 m
299 m
Apr, 29 08:00 @ Mostly stable
11:00
7.3 97%
5%
3 °C
1 °C
8 km/h
12 km/h
1021 mb
98.2%
753 m
370 m
Apr, 29 11:00 @ Stable
14:00
1.3 63%
95%
5 °C
2 °C
10 km/h
16 km/h
1021 mb
92.8%
935 m
579 m
Apr, 29 14:00 @ Mostly stable
17:00
3.2 66%
95%
6 °C
4 °C
11 km/h
22 km/h
1020 mb
86.8%
1,051 m
1,083 m
Apr, 29 17:00 @ Stable
20:00
1 57%
98%
3 °C
2 °C
5 km/h
7 km/h
1021 mb
91.6%
1,004 m
42 m
Apr, 29 20:00 @ Stable
23:00
1.1 39%
98%
0 °C
0 °C
3 km/h 
6 km/h
1021 mb
96.1%
815 m
29 m
Apr, 29 23:00 @ Stable
30 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 and showers.
The sky will be overcast:
64% middle clouds (from 2,000 to 6,000 meters: Altostratus, Altocumulus)
97% low clouds (below 2,000 meters: Cumulus, Stratocumulus, Stratus, Fractostratus)
12% convective clouds (Cumulonimbus)
The highest temperature will reach 4 degrees Celsius, while the the lowest temperature will drop to 0 degrees Celsius. The wind will be a light breeze, fog will form, and the mean air pressure will be 1021 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
5.6 90%
1 °C
-1 °C
4 km/h
6 km/h
1020 mb
99.6%
537 m
130 m
Apr, 30 02:00 @ Mostly stable
05:00
9.1 98%
3%
2 °C
1 °C
4 km/h
15 km/h
1019 mb
99.5%
717 m
427 m
Apr, 30 05:00 @ Mostly stable
08:00
2.2 71%
9%
2 °C
2 °C
3 km/h
12 km/h
1020 mb
99.6%
779 m
293 m
Apr, 30 08:00 @ Mostly stable
11:00
4.5 84%
7%
3 °C
3 °C
3 km/h
6 km/h
1020 mb
99.4%
753 m
323 m
Apr, 30 11:00 @ Mostly stable
14:00
3.1 76%
4%
3 °C
2 °C
6 km/h
7 km/h
1021 mb
98.8%
836 m
313 m
Apr, 30 14:00 @ Mostly stable
17:00
3.4 73%
5%
4 °C
3 °C
6 km/h
6 km/h
1021 mb
97.1%
940 m
304 m
Apr, 30 17:00 @ Mostly stable
20:00
4 °C
2 °C
6 km/h
7 km/h
1022 mb
94.3%
1,039 m
46 m
Apr, 30 20:00 @ Mostly stable
23:00
3 °C
2 °C
5 km/h
6 km/h
1024 mb
97.7%
1,060 m
44 m
Apr, 30 23:00 @ Mostly stable
1 May will be cool and the weather will be very stable.
The sky will be mostly cloudy:
45% high clouds (above 6,000 meters: Cirrus, Cirrus uncinus, Cirrostratus, Cirrocumulus)
43% middle clouds (from 2,000 to 6,000 meters: Altostratus, Altocumulus)
56% low clouds (below 2,000 meters: Cumulus, Stratocumulus, Stratus, Fractostratus)
2% convective clouds (Cumulonimbus)
The highest temperature will reach 10 degrees Celsius, while the the lowest temperature will drop to 2 degrees Celsius. The wind will be a light breeze, fog will form, and the mean air pressure will be 1023 mb. Relative humidity will be very high.
Wednesday
Weather
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
3 °C
1 °C
6 km/h
7 km/h
1025 mb
99.3%
1,035 m
62 m
May, 1 02:00 @ Stable
05:00
3 °C
2 °C
5 km/h
8 km/h
1026 mb
99.5%
957 m
72 m
May, 1 05:00 @ Stable
08:00
4 °C
3 °C
4 km/h
5 km/h
1026 mb
97.0%
949 m
133 m
May, 1 08:00 @ Very stable
11:00
7 °C
6 °C
5 km/h
7 km/h
1025 mb
82.4%
1,011 m
766 m
May, 1 11:00 @ Stable
14:00
9 °C
9 °C
4 km/h
5 km/h
1024 mb
72.5%
1,263 m
911 m
May, 1 14:00 @ Stable
17:00
10 °C
10 °C
3 km/h
6 km/h
1023 mb
72.7%
1,747 m
842 m
May, 1 17:00 @ Stable
20:00
6 °C
6 °C
4 km/h
9 km/h
1021 mb
92.8%
1,983 m
44 m
May, 1 20:00 @ Stable
23:00
5 °C
4 °C
6 km/h
11 km/h
1020 mb
93.0%
1,914 m
61 m
May, 1 23:00 @ Very stable
2 May will be with moderate temperatures and the weather will be very stable.
There is a 95% probability of moderate rainfall and showers.
The sky will be mostly cloudy:
34% high clouds (above 6,000 meters: Cirrus, Cirrus uncinus, Cirrostratus, Cirrocumulus)
32% middle clouds (from 2,000 to 6,000 meters: Altostratus, Altocumulus)
77% low clouds (below 2,000 meters: Cumulus, Stratocumulus, Stratus, Fractostratus)
20% convective clouds (Cumulonimbus)
The highest temperature will reach 11 degrees Celsius, while the the lowest temperature will drop to 3 degrees Celsius. The wind will be a light breeze, fog will form, and the mean air pressure will be 1019 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
0.6 56%
5 °C
3 °C
7 km/h
9 km/h
1019 mb
96.1%
1,439 m
59 m
May, 2 02:00 @ Stable
05:00
6.5 95%
1%
5 °C
4 °C
6 km/h
17 km/h
1018 mb
99.0%
1,388 m
239 m
May, 2 05:00 @ Stable
08:00
3.4 77%
2%
4 °C
5 °C
3 km/h
11 km/h
1018 mb
99.2%
1,375 m
208 m
May, 2 08:00 @ Extremely stable
11:00
4.9 83%
10%
6 °C
5 °C
4 km/h
7 km/h
1019 mb
98.2%
1,286 m
218 m
May, 2 11:00 @ Extremely stable
14:00
1.4 58%
96%
9 °C
9 °C
6 km/h
13 km/h
1019 mb
82.8%
1,355 m
957 m
May, 2 14:00 @ Extremely stable
17:00
2.3 50%
98%
10 °C
10 °C
6 km/h
11 km/h
1019 mb
69.4%
1,466 m
1,201 m
May, 2 17:00 @ Extremely stable
20:00
7 °C
7 °C
4 km/h
4 km/h
1020 mb
81.9%
1,512 m
12 m
May, 2 20:00 @ Very stable
23:00
4 °C
3 °C
6 km/h 
7 km/h
1021 mb
93.5%
1,427 m
16 m
May, 2 23:00 @ Very stable
3 May will be with moderate temperatures and the weather will be very stable.
There is a 98% probability of moderate rainfall and showers.
The sky will be overcast:
99% high clouds (above 6,000 meters: Cirrus, Cirrus uncinus, Cirrostratus, Cirrocumulus)
92% middle clouds (from 2,000 to 6,000 meters: Altostratus, Altocumulus)
51% low clouds (below 2,000 meters: Cumulus, Stratocumulus, Stratus, Fractostratus)
9% convective clouds (Cumulonimbus)
The highest temperature will reach 14 degrees Celsius, while the the lowest temperature will drop to 2 degrees Celsius. The wind will be a light breeze, fog will form, and the mean air pressure will be 1014 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
02:00
2 °C
0 °C
7 km/h
8 km/h
1019 mb
95.6%
2,320 m
30 m
May, 3 02:00 @ Extremely stable
05:00
3 °C
1 °C
7 km/h
7 km/h
1018 mb
92.2%
2,257 m
41 m
May, 3 05:00 @ Extremely stable
08:00
6 °C
5 °C
6 km/h
9 km/h
1016 mb
80.3%
2,455 m
157 m
May, 3 08:00 @ Extremely stable
11:00
12 °C
12 °C
7 km/h 
14 km/h
1014 mb
58.0%
2,233 m
890 m
May, 3 11:00 @ Very stable
14:00
13 °C
14 °C
5 km/h
21 km/h
1012 mb
50.7%
1,793 m
1,419 m
May, 3 14:00 @ Very stable
17:00
3.2 76%
3%
7 °C
6 °C
7 km/h
21 km/h
1013 mb
96.7%
1,466 m
853 m
May, 3 17:00 @ Stable
20:00
6.3 94%
2%
6 °C
7 °C
3 km/h 
5 km/h
1012 mb
99.0%
1,445 m
71 m
May, 3 20:00 @ Stable
23:00
9.9 98%
5%
6 °C
6 °C
3 km/h 
5 km/h
1011 mb
99.1%
1,383 m
81 m
May, 3 23:00 @ Stable
4 May will be cool and the weather will be .
There is a 67% probability of light rainfall and showers.
The sky will be :
295% high clouds (above 6,000 meters: Cirrus, Cirrus uncinus, Cirrostratus, Cirrocumulus)
500% middle clouds (from 2,000 to 6,000 meters: Altostratus, Altocumulus)
348% low clouds (below 2,000 meters: Cumulus, Stratocumulus, Stratus, Fractostratus)
164% convective clouds (Cumulonimbus)
The highest temperature will reach 10 degrees Celsius, while the the lowest temperature will drop to 4 degrees Celsius. The wind will be a light breeze, fog will form, and the mean air pressure will be 5032 mb. Relative humidity will be .
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
1.1 64%
23%
6 °C
8 °C
1 km/h
5 km/h
1009 mb
99.4%
1,302 m
131 m
May, 4 02:00 @ Stable
05:00
1.6 67%
33%
5 °C
4 °C
4 km/h
5 km/h
1007 mb
98.8%
1,237 m
77 m
May, 4 05:00 @ Stable
08:00
0.2 45%
53%
5 °C
4 °C
6 km/h
7 km/h
1007 mb
96.0%
1,131 m
220 m
May, 4 08:00 @ Stable
11:00
1.1 61%
85%
8 °C
7 °C
7 km/h
9 km/h
1006 mb
78.9%
1,162 m
882 m
May, 4 11:00 @ Stable
14:00
0.8 57%
100%
10 °C
9 °C
7 km/h
9 km/h
1005 mb
65.8%
1,321 m
1,246 m
May, 4 14:00 @ Mostly stable
Mount Saint Helens National Volcanic Monument Headquarters
16:01 
