Helvetia Rainfall Forecast

Today 25 May
85%
Tue 26 May
30%
Wed 27 May
No Rain
Thu 28 May
10%
Fri 29 May
5%
Sat 30 May
5%
Sun 31 May
15%

Helvetia Rainfall Statistics

May Rainfall

Portland-Hillsboro Airport (3.7 miles)

Total Rainfall 2026
15.5in
Daily Average 2026
0.1in
Wettest Day 11 March, 2026
1.4in
Wet Days 2026
61/145 (42%)
Total Rainfall April
2.9in
Daily Average April
0.1in
Wettest Day 15 April, 2026
0.6in
Wet Days April
11/30 (37%)
Total Rainfall May
0.5in
Daily Average May
0.02in
Wettest Day 13 May, 2026
0.2in
Wet Days May
5/25 (20%)

Climate (2010–Present)

Portland-Hillsboro Airport (3.7 miles)

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Annual Average 2021–2025
34.4in
Monthly Average 2021–2026
2.9in
Daily Average 2021–2026
0.1in
Wettest Day 26 December, 2022
2.5in

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