San Mateo Reservoir Rainfall Forecast

Today 3 May
15%
Mon 4 May
30%
Tue 5 May
65%
Wed 6 May
30%
Thu 7 May
5%
Fri 8 May
5%
Sat 9 May
5%

San Mateo Reservoir Rainfall Statistics

May Rainfall

Grants, Grants-Milan Municipal Airport (18.6 miles)

Total Rainfall 2026
0.9in
Daily Average 2026
0.01in
Wettest Day 13 February, 2026
0.6in
Wet Days 2026
5/123 (4%)
Total Rainfall April
0.01in
Daily Average April
0in
Wettest Day 11 April, 2026
0.01in
Wet Days April
1/30 (3%)
Total Rainfall May
–
Daily Average May
–
Wettest Day 4 May, 2026
–
Wet Days May
–

Climate (2010–Present)

Grants, Grants-Milan Municipal Airport (18.6 miles)

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Annual Average 2021–2025
8.3in
Monthly Average 2021–2026
0.7in
Daily Average 2021–2026
0.02in
Wettest Day 21 June, 2024
2in

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