Knappa Slough - Knappa Rainfall Forecast

Today 10 Sep
5%
Fri 11 Sep
5%
Sat 12 Sep
70%
Sun 13 Sep
15%
Mon 14 Sep
No Rain
Tue 15 Sep
No Rain
Wed 16 Sep
No Rain

Knappa Slough - Knappa Rainfall Statistics

September Rainfall

Astoria, Astoria Regional Airport (13.7 miles)

Total Rainfall 2026
33.4in
Daily Average 2026
0.1in
Wettest Day 11 March, 2026
1.9in
Wet Days 2026
87/253 (34%)
Total Rainfall August
0.5in
Daily Average August
0.02in
Wettest Day 1 August, 2026
0.3in
Wet Days August
6/31 (19%)
Total Rainfall September
1.5in
Daily Average September
0.2in
Wettest Day 3 September, 2026
1.2in
Wet Days September
3/10 (30%)

Climate (2021–2025)

Astoria, Astoria Regional Airport (13.7 miles)

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Annual Average 2021–2025
65.5in
Monthly Average 2021–2026
5.3in
Daily Average 2021–2026
0.2in
Wettest Day 6 January, 2022
5.1in

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