Gulf of the Farallones Marine Sanctuary Rainfall Forecast

Today 30 Dec
20%
Wed 31 Dec
100%
Thu 1 Jan
100%
Fri 2 Jan
90%
Sat 3 Jan
75%
Sun 4 Jan
60%
Mon 5 Jan
60%

Gulf of the Farallones Marine Sanctuary Rainfall Statistics

December Rainfall

Half Moon Bay Airport (11.8 miles)

Total Rainfall 2025
12.7in
Daily Average 2025
0.04in
Wettest Day 13 November, 2025
1.6in
Wet Days 2025
62/364 (17%)
Total Rainfall November
2.6in
Daily Average November
0.1in
Wettest Day 13 November, 2025
1.6in
Wet Days November
7/30 (23%)
Total Rainfall December
2.1in
Daily Average December
0.1in
Wettest Day 22 December, 2025
1in
Wet Days December
9/30 (30%)

Climate (2010–Present)

Half Moon Bay Airport (11.8 miles)

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Annual Average 2020–2024
19.1in
Monthly Average 2020–2025
1.7in
Daily Average 2020–2025
0.1in
Wettest Day 24 October, 2021
3.5in

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