Sat
Apr 27
Very stable
~14
l/m2
77%
Sun
Apr 28
Very stable
~8
l/m2
66%
Mon
Apr 29
Mostly stable
~21
l/m2
90%
Tue
Apr 30
Mostly stable
~26
l/m2
98%
Wed
May 1
Very stable
~0.2
l/m2
35%
Thu
May 2
Very stable
~14
l/m2
98%
Fri
May 3
Very stable
~5
l/m2
79%
27 Apr will be cool and the weather will be very stable.
There is a 77% probability of moderate rainfall and showers.
The sky will be overcast:
83% high clouds (above 6,000 meters: Cirrus, Cirrus uncinus, Cirrostratus, Cirrocumulus)
60% middle clouds (from 2,000 to 6,000 meters: Altostratus, Altocumulus)
98% low clouds (below 2,000 meters: Cumulus, Stratocumulus, Stratus, Fractostratus)
28% 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
02:00
1.3 65%
49%
7 °C
6 °C
5 km/h 
7 km/h
1018 mb
97.4%
1,461 m
114 m
Apr, 27 02:00 @ Very stable
05:00
2.2 69%
64%
6 °C
5 °C
6 km/h
17 km/h
1018 mb
99.0%
1,356 m
349 m
Apr, 27 05:00 @ Very stable
08:00
0.6 59%
87%
6 °C
5 °C
6 km/h
23 km/h
1018 mb
97.7%
1,227 m
502 m
Apr, 27 08:00 @ Extremely stable
11:00
1.5 64%
89%
7 °C
6 °C
8 km/h
20 km/h
1019 mb
87.8%
1,166 m
1,058 m
Apr, 27 11:00 @ Very stable
14:00
1.9 69%
19%
6 °C
5 °C
6 km/h
20 km/h
1019 mb
96.1%
1,241 m
1,016 m
Apr, 27 14:00 @ Very stable
17:00
3.4 77%
16%
6 °C
5 °C
4 km/h
21 km/h
1019 mb
96.8%
1,317 m
920 m
Apr, 27 17:00 @ Stable
20:00
1.3 63%
6 °C
6 °C
3 km/h
16 km/h
1019 mb
97.8%
1,666 m
397 m
Apr, 27 20:00 @ Stable
23:00
1.7 64%
6%
6 °C
5 °C
5 km/h
15 km/h
1020 mb
98.5%
1,601 m
350 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:
50% high clouds (above 6,000 meters: Cirrus, Cirrus uncinus, Cirrostratus, Cirrocumulus)
46% middle clouds (from 2,000 to 6,000 meters: Altostratus, Altocumulus)
85% low clouds (below 2,000 meters: Cumulus, Stratocumulus, Stratus, Fractostratus)
37% convective clouds (Cumulonimbus)
The highest temperature will reach 9 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
0.3 55%
82%
6 °C
5 °C
7 km/h 
12 km/h
1020 mb
99.2%
1,392 m
266 m
Apr, 28 02:00 @ Very stable
05:00
0.8 58%
83%
6 °C
4 °C
7 km/h
7 km/h
1020 mb
98.6%
1,279 m
163 m
Apr, 28 05:00 @ Very stable
08:00
0.6 53%
100%
6 °C
5 °C
8 km/h
12 km/h
1021 mb
95.4%
1,234 m
275 m
Apr, 28 08:00 @ Extremely stable
11:00
1.3 58%
99%
8 °C
6 °C
13 km/h
19 km/h
1021 mb
79.9%
1,234 m
1,122 m
Apr, 28 11:00 @ Extremely stable
14:00
0.9 51%
100%
9 °C
7 °C
11 km/h
19 km/h
1020 mb
75.6%
1,338 m
1,093 m
Apr, 28 14:00 @ Very stable
17:00
1.7 63%
100%
8 °C
6 °C
12 km/h
21 km/h
1020 mb
77.7%
1,269 m
1,139 m
Apr, 28 17:00 @ Very stable
20:00
0.8 58%
94%
5 °C
4 °C
8 km/h
13 km/h
1020 mb
91.3%
1,171 m
209 m
Apr, 28 20:00 @ Very stable
23:00
1.5 66%
82%
4 °C
3 °C
7 km/h
11 km/h
1020 mb
94.3%
1,009 m
234 m
Apr, 28 23:00 @ Very stable
29 Apr will be cool and the weather will be stable, thunderstorms not likely.
There is a 90% probability of moderate rainfall, light sleet and snowfall and showers.
The sky will be overcast:
77% middle clouds (from 2,000 to 6,000 meters: Altostratus, Altocumulus)
80% low clouds (below 2,000 meters: Cumulus, Stratocumulus, Stratus, Fractostratus)
28% 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
0.9 63%
14%
4 °C
2 °C
7 km/h
23 km/h
1018 mb
98.3%
972 m
627 m
Apr, 29 02:00 @ Stable
05:00
5.6 90%
7%
3 °C
1 °C
8 km/h
12 km/h
1018 mb
97.5%
804 m
288 m
Apr, 29 05:00 @ Mostly stable
08:00
1.9 68%
11%
3 °C
1 °C
7 km/h
10 km/h
1019 mb
97.5%
748 m
293 m
Apr, 29 08:00 @ Mostly stable
11:00
3.5 76%
45%
4 °C
2 °C
9 km/h
15 km/h
1021 mb
94.0%
852 m
495 m
Apr, 29 11:00 @ Mostly stable
14:00
2.9 70%
91%
6 °C
4 °C
9 km/h
21 km/h
1021 mb
87.6%
1,031 m
1,145 m
Apr, 29 14:00 @ Mostly stable
17:00
4.6 65%
94%
7 °C
4 °C
15 km/h
24 km/h
1020 mb
83.4%
1,144 m
964 m
Apr, 29 17:00 @ Stable
20:00
0.7 49%
99%
4 °C
2 °C
8 km/h
10 km/h
1021 mb
86.9%
1,124 m
90 m
Apr, 29 20:00 @ Stable
23:00
0.7 54%
99%
1 °C
0 °C
3 km/h 
8 km/h
1021 mb
94.8%
869 m
48 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 and showers.
The sky will be overcast:
57% middle clouds (from 2,000 to 6,000 meters: Altostratus, Altocumulus)
87% low clouds (below 2,000 meters: Cumulus, Stratocumulus, Stratus, Fractostratus)
9% convective clouds (Cumulonimbus)
The highest temperature will reach 6 degrees Celsius, while the the lowest temperature will drop to 1 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
4.9 86%
2 °C
1 °C
5 km/h
18 km/h
1020 mb
99.4%
765 m
395 m
Apr, 30 02:00 @ Mostly stable
05:00
7.1 98%
3%
2 °C
1 °C
4 km/h
19 km/h
1020 mb
99.5%
753 m
521 m
Apr, 30 05:00 @ Mostly stable
08:00
2.9 74%
4%
2 °C
2 °C
2 km/h
9 km/h
1020 mb
99.6%
658 m
313 m
Apr, 30 08:00 @ Mostly stable
11:00
8 98%
2%
2 °C
1 °C
5 km/h
7 km/h
1021 mb
99.6%
844 m
200 m
Apr, 30 11:00 @ Mostly stable
14:00
0.7 61%
21%
4 °C
2 °C
6 km/h
6 km/h
1022 mb
98.8%
942 m
256 m
Apr, 30 14:00 @ Mostly stable
17:00
1.2 57%
40%
6 °C
5 °C
6 km/h
7 km/h
1022 mb
91.2%
1,082 m
446 m
Apr, 30 17:00 @ Mostly stable
20:00
0.2 31%
100%
4 °C
3 °C
5 km/h
6 km/h
1023 mb
96.3%
1,151 m
17 m
Apr, 30 20:00 @ Mostly stable
23:00
0.2 38%
100%
3 °C
2 °C
4 km/h
5 km/h
1025 mb
98.4%
1,136 m
38 m
Apr, 30 23:00 @ Stable
1 May will be with moderate temperatures and the weather will be very stable.
There is a 35% probability of light rainfall.
The sky will be overcast:
68% high clouds (above 6,000 meters: Cirrus, Cirrus uncinus, Cirrostratus, Cirrocumulus)
71% middle clouds (from 2,000 to 6,000 meters: Altostratus, Altocumulus)
48% low clouds (below 2,000 meters: Cumulus, Stratocumulus, Stratus, Fractostratus)
The highest temperature will reach 12 degrees Celsius, while the the lowest temperature will drop to 1 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
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
1 °C
5 km/h
7 km/h
1026 mb
98.7%
1,102 m
37 m
May, 1 02:00 @ Stable
05:00
1 °C
1 °C
3 km/h 
4 km/h
1027 mb
99.0%
958 m
26 m
May, 1 05:00 @ Very stable
08:00
4 °C
4 °C
4 km/h
5 km/h
1027 mb
94.2%
910 m
114 m
May, 1 08:00 @ Very stable
11:00
7 °C
8 °C
4 km/h
4 km/h
1025 mb
78.6%
1,062 m
817 m
May, 1 11:00 @ Very stable
14:00
11 °C
12 °C
5 km/h
7 km/h
1023 mb
62.8%
1,495 m
1,111 m
May, 1 14:00 @ Very stable
17:00
11 °C
11 °C
5 km/h
8 km/h
1021 mb
65.2%
2,100 m
886 m
May, 1 17:00 @ Stable
20:00
8 °C
7 °C
6 km/h 
6 km/h
1019 mb
89.8%
2,187 m
25 m
May, 1 20:00 @ Stable
23:00
0.2 35%
6 °C
6 °C
5 km/h
9 km/h
1018 mb
94.8%
1,710 m
53 m
May, 1 23:00 @ Stable
2 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 mostly cloudy:
12% high clouds (above 6,000 meters: Cirrus, Cirrus uncinus, Cirrostratus, Cirrocumulus)
13% middle clouds (from 2,000 to 6,000 meters: Altostratus, Altocumulus)
69% low clouds (below 2,000 meters: Cumulus, Stratocumulus, Stratus, Fractostratus)
16% convective clouds (Cumulonimbus)
The highest temperature will reach 12 degrees Celsius, while the the lowest temperature will drop to 3 degrees Celsius. The wind will be a gentle breeze, fog will form, and the mean air pressure will be 1018 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
3 75%
6 °C
6 °C
4 km/h
12 km/h
1017 mb
98.2%
1,482 m
133 m
May, 2 02:00 @ Stable
05:00
7.2 98%
2%
6 °C
5 °C
5 km/h
23 km/h
1017 mb
98.1%
1,507 m
461 m
May, 2 05:00 @ Stable
08:00
0.4 57%
22%
6 °C
6 °C
4 km/h
11 km/h
1018 mb
97.7%
1,373 m
347 m
May, 2 08:00 @ Very stable
11:00
0.9 51%
72%
7 °C
6 °C
8 km/h
14 km/h
1018 mb
90.0%
1,286 m
652 m
May, 2 11:00 @ Very stable
14:00
0.8 51%
99%
11 °C
9 °C
12 km/h
18 km/h
1018 mb
63.0%
1,457 m
1,718 m
May, 2 14:00 @ Stable
17:00
1 44%
100%
11 °C
10 °C
12 km/h
15 km/h
1018 mb
56.7%
1,546 m
1,362 m
May, 2 17:00 @ Stable
20:00
7 °C
6 °C
5 km/h
6 km/h
1019 mb
79.6%
1,543 m
17 m
May, 2 20:00 @ Very stable
23:00
3 °C
3 °C
5 km/h
6 km/h
1021 mb
93.8%
1,513 m
22 m
May, 2 23:00 @ Extremely stable
3 May will be with moderate temperatures and the weather will be very stable.
There is a 79% probability of moderate rainfall and showers.
The sky will be overcast:
86% high clouds (above 6,000 meters: Cirrus, Cirrus uncinus, Cirrostratus, Cirrocumulus)
88% middle clouds (from 2,000 to 6,000 meters: Altostratus, Altocumulus)
29% low clouds (below 2,000 meters: Cumulus, Stratocumulus, Stratus, Fractostratus)
10% convective clouds (Cumulonimbus)
The highest temperature will reach 13 degrees Celsius, while the the lowest temperature will drop to 2 degrees Celsius. The wind will be a light breeze, and the mean air pressure will be 1015 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
3 °C
1 °C
6 km/h
6 km/h
1020 mb
93.1%
1,452 m
28 m
May, 3 02:00 @ Extremely stable
05:00
2 °C
1 °C
6 km/h
7 km/h
1020 mb
92.8%
1,541 m
18 m
May, 3 05:00 @ Very stable
08:00
6 °C
9 °C
1 km/h
5 km/h
1019 mb
74.2%
2,241 m
211 m
May, 3 08:00 @ Extremely stable
11:00
11 °C
11 °C
5 km/h
9 km/h
1017 mb
60.3%
2,342 m
944 m
May, 3 11:00 @ Very stable
14:00
12 °C
12 °C
6 km/h
12 km/h
1015 mb
57.9%
2,172 m
1,044 m
May, 3 14:00 @ Very stable
17:00
11 °C
11 °C
6 km/h
11 km/h
1013 mb
66.1%
1,680 m
885 m
May, 3 17:00 @ Very stable
20:00
0.8 62%
42%
7 °C
7 °C
4 km/h
7 km/h
1012 mb
95.8%
1,533 m
56 m
May, 3 20:00 @ Very stable
23:00
3.7 79%
21%
5 °C
4 °C
6 km/h
21 km/h
1011 mb
99.2%
1,224 m
707 m
May, 3 23:00 @ Stable
4 May will be cool and the weather will be .
There is a 97% probability of heavy rainfall and showers.
The sky will be :
211% middle clouds (from 2,000 to 6,000 meters: Altostratus, Altocumulus)
290% low clouds (below 2,000 meters: Cumulus, Stratocumulus, Stratus, Fractostratus)
67% convective clouds (Cumulonimbus)
The highest temperature will reach 5 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 3031 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
5.8 91%
6%
4 °C
3 °C
6 km/h
16 km/h
1011 mb
99.2%
1,079 m
397 m
May, 4 02:00 @ Mostly stable
05:00
11 97%
5%
4 °C
2 °C
8 km/h
16 km/h
1010 mb
98.5%
933 m
383 m
May, 4 05:00 @ Mostly stable
08:00
1.4 62%
26%
4 °C
2 °C
10 km/h
20 km/h
1011 mb
94.7%
892 m
518 m
May, 4 08:00 @ Stable
Saint Helens Ranger Station
08:22 
