Grantham Rainfall Forecast

Today 8 Sep
10%
Wed 9 Sep
30%
Thu 10 Sep
75%
Fri 11 Sep
15%
Sat 12 Sep
5%
Sun 13 Sep
25%
Mon 14 Sep
10%

Grantham Rainfall Statistics

September Rainfall

Lebanon Municipal Airport (12.4 miles)

Total Rainfall 2026
21.4in
Daily Average 2026
0.1in
Wettest Day 14 May, 2026
1.4in
Wet Days 2026
96/251 (38%)
Total Rainfall August
3.4in
Daily Average August
0.1in
Wettest Day 23 August, 2026
1.1in
Wet Days August
9/31 (29%)
Total Rainfall September
0.6in
Daily Average September
0.1in
Wettest Day 1 September, 2026
0.3in
Wet Days September
3/8 (38%)

Climate (2021–2025)

Lebanon Municipal Airport (12.4 miles)

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Annual Average 2021–2025
36.6in
Monthly Average 2021–2026
3in
Daily Average 2021–2026
0.1in
Wettest Day 10 July, 2023
3.1in

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