Thunder Bay National Marine Sanctuary Rainfall Forecast

Today 4 Sep
80%
Fri 5 Sep
60%
Sat 6 Sep
30%
Sun 7 Sep
30%
Mon 8 Sep
5%
Tue 9 Sep
10%
Wed 10 Sep
10%

Thunder Bay National Marine Sanctuary Rainfall Statistics

September Rainfall

Alpena, Alpena County Regional Airport (22.4 miles)

Total Rainfall 2025
20.1in
Daily Average 2025
0.1in
Wettest Day 19 August, 2025
1.5in
Wet Days 2025
99/247 (40%)
Total Rainfall August
3.6in
Daily Average August
0.1in
Wettest Day 19 August, 2025
1.5in
Wet Days August
10/31 (32%)
Total Rainfall September
0in
Daily Average September
0in
Wettest Day 1 September, 2025
0in
Wet Days September
–

Climate (2010–Present)

Alpena, Alpena County Regional Airport (22.4 miles)

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Annual Average 2020–2024
30.8in
Monthly Average 2020–2025
2.5in
Daily Average 2020–2025
0.1in
Wettest Day 26 July, 2023
3.5in

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