St Helena Rainfall Forecast

Today 19 Apr
25%
Mon 20 Apr
90%
Tue 21 Apr
95%
Wed 22 Apr
35%
Thu 23 Apr
No Rain
Fri 24 Apr
5%
Sat 25 Apr
5%

St Helena Rainfall Statistics

April Rainfall

Petaluma Municipal Airport (18 miles)

Total Rainfall 2026
7.9in
Daily Average 2026
0.1in
Wettest Day 15 February, 2026
1.2in
Wet Days 2026
24/109 (22%)
Total Rainfall March
0.04in
Daily Average March
0in
Wettest Day 31 March, 2026
0.02in
Wet Days March
2/31 (6%)
Total Rainfall April
2in
Daily Average April
0.1in
Wettest Day 10 April, 2026
1.1in
Wet Days April
4/19 (21%)

Climate (2011–Present)

Petaluma Municipal Airport (18 miles)

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Annual Average 2021–2025
11.9in
Monthly Average 2021–2026
1.1in
Daily Average 2021–2026
0.04in
Wettest Day 24 October, 2021
4.8in

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