Columbia River - Knapp Landing Rainfall Forecast

Today 18 Sep
No Rain
Sat 19 Sep
No Rain
Sun 20 Sep
No Rain
Mon 21 Sep
No Rain
Tue 22 Sep
No Rain
Wed 23 Sep
No Rain
Thu 24 Sep
20%

Columbia River - Knapp Landing Rainfall Statistics

September Rainfall

Scappoose Industrial Airpark (5.6 miles)

Total Rainfall 2026
16in
Daily Average 2026
0.1in
Wettest Day 11 March, 2026
1.4in
Wet Days 2026
69/261 (26%)
Total Rainfall August
0.1in
Daily Average August
0in
Wettest Day 1 August, 2026
0.1in
Wet Days August
2/31 (6%)
Total Rainfall September
0.6in
Daily Average September
0.04in
Wettest Day 2 September, 2026
0.3in
Wet Days September
5/18 (28%)

Climate (2021–2025)

Scappoose Industrial Airpark (5.6 miles)

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Annual Average 2021–2025
36.1in
Monthly Average 2021–2026
3in
Daily Average 2021–2026
0.1in
Wettest Day 4 November, 2022
3.1in

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