McCormack Slough Rainfall Forecast

Today 7 Sep
5%
Tue 8 Sep
No Rain
Wed 9 Sep
No Rain
Thu 10 Sep
No Rain
Fri 11 Sep
5%
Sat 12 Sep
10%
Sun 13 Sep
5%

McCormack Slough Rainfall Statistics

September Rainfall

Hermiston, Hermiston Municipal Airport (16.2 miles)

Total Rainfall 2026
4.5in
Daily Average 2026
0.02in
Wettest Day 8 February, 2026
0.7in
Wet Days 2026
38/250 (15%)
Total Rainfall August
0.03in
Daily Average August
0in
Wettest Day 15 August, 2026
0.03in
Wet Days August
1/31 (3%)
Total Rainfall September
0.1in
Daily Average September
0.04in
Wettest Day 2 September, 2026
0.1in
Wet Days September
2/7 (29%)

Climate (2021–2025)

Hermiston, Hermiston Municipal Airport (16.2 miles)

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Annual Average 2021–2025
9.4in
Monthly Average 2021–2026
0.8in
Daily Average 2021–2026
0.03in
Wettest Day 5 May, 2024
1.1in

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