Portland Rainfall Forecast

Today 12 May
25%
Wed 13 May
No Rain
Thu 14 May
35%
Fri 15 May
10%
Sat 16 May
No Rain
Sun 17 May
50%
Mon 18 May
25%

Portland Rainfall Statistics

May Rainfall

Grand Forks, Grand Forks International Airport (32.3 miles)

Total Rainfall 2026
2.9in
Daily Average 2026
0.02in
Wettest Day 18 February, 2026
0.6in
Wet Days 2026
30/132 (23%)
Total Rainfall April
1.1in
Daily Average April
0.04in
Wettest Day 4 April, 2026
0.3in
Wet Days April
11/30 (37%)
Total Rainfall May
0.1in
Daily Average May
0.01in
Wettest Day 4 May, 2026
0.1in
Wet Days May
2/12 (17%)

Climate (2010–Present)

Grand Forks, Grand Forks International Airport (32.3 miles)

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Annual Average 2021–2025
19.4in
Monthly Average 2021–2026
1.6in
Daily Average 2021–2026
0.1in
Wettest Day 29 August, 2024
2.4in

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