McCormack Slough Rainfall Forecast

Today 15 May
50%
Fri 16 May
10%
Sat 17 May
70%
Sun 18 May
15%
Mon 19 May
15%
Tue 20 May
5%
Wed 21 May
5%

McCormack Slough Rainfall Statistics

May Rainfall

Hermiston, Hermiston Municipal Airport (16.2 miles)

Total Rainfall 2025
4.9in
Daily Average 2025
0.04in
Wettest Day 7 April, 2025
0.6in
Wet Days 2025
35/135 (26%)
Total Rainfall April
0.7in
Daily Average April
0.02in
Wettest Day 7 April, 2025
0.6in
Wet Days April
5/30 (17%)
Total Rainfall May
0.2in
Daily Average May
0.01in
Wettest Day 11 May, 2025
0.1in
Wet Days May
3/15 (20%)

Climate (2010–Present)

Hermiston, Hermiston Municipal Airport (16.2 miles)

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Annual Average 2020–2024
8.2in
Monthly Average 2020–2025
0.8in
Daily Average 2020–2025
0.02in
Wettest Day 5 May, 2024
1.1in

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