Mount St Helens Rainfall Forecast

Today 18 Apr
5%
Sun 19 Apr
5%
Mon 20 Apr
50%
Tue 21 Apr
80%
Wed 22 Apr
85%
Thu 23 Apr
45%
Fri 24 Apr
10%

Mount St Helens Rainfall Statistics

April Rainfall

Southwest Washington Regional Airport (33.6 miles)

Total Rainfall 2026
14.4in
Daily Average 2026
0.1in
Wettest Day 13 March, 2026
1.6in
Wet Days 2026
57/108 (53%)
Total Rainfall March
5.4in
Daily Average March
0.2in
Wettest Day 13 March, 2026
1.6in
Wet Days March
18/31 (58%)
Total Rainfall April
1.7in
Daily Average April
0.1in
Wettest Day 15 April, 2026
0.6in
Wet Days April
6/18 (33%)

Climate (2010–Present)

Southwest Washington Regional Airport (33.6 miles)

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Annual Average 2021–2025
39.7in
Monthly Average 2021–2026
3.3in
Daily Average 2021–2026
0.1in
Wettest Day 4 November, 2022
4.2in

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