San Juan Island - Grandmas Cove Rainfall Forecast

Today 10 Aug
No Rain
Tue 11 Aug
No Rain
Wed 12 Aug
No Rain
Thu 13 Aug
No Rain
Fri 14 Aug
No Rain
Sat 15 Aug
No Rain
Sun 16 Aug
15%

San Juan Island - Grandmas Cove Rainfall Statistics

August Rainfall

Friday Harbor Airport (3.7 miles)

Total Rainfall 2026
10.3in
Daily Average 2026
0.05in
Wettest Day 12 January, 2026
0.8in
Wet Days 2026
69/222 (31%)
Total Rainfall July
0.8in
Daily Average July
0.02in
Wettest Day 16 July, 2026
0.3in
Wet Days July
5/31 (16%)
Total Rainfall August
0.04in
Daily Average August
0.01in
Wettest Day 1 August, 2026
0.04in
Wet Days August
1/10 (10%)

Climate (2021–2025)

Friday Harbor Airport (3.7 miles)

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Annual Average 2021–2025
20.6in
Monthly Average 2021–2026
1.8in
Daily Average 2021–2026
0.1in
Wettest Day 15 November, 2021
1.9in

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