Herndon Rainfall Forecast

Today 21 Sep
50%
Tue 22 Sep
90%
Wed 23 Sep
75%
Thu 24 Sep
40%
Fri 25 Sep
15%
Sat 26 Sep
15%
Sun 27 Sep
15%

Herndon Rainfall Statistics

September Rainfall

Washington/Dulles International Airport, DC (4.3 miles)

Total Rainfall 2026
31in
Daily Average 2026
0.1in
Wettest Day 28 June, 2026
2in
Wet Days 2026
89/264 (34%)
Total Rainfall August
4.9in
Daily Average August
0.2in
Wettest Day 16 August, 2026
1.4in
Wet Days August
13/31 (42%)
Total Rainfall September
1.6in
Daily Average September
0.1in
Wettest Day 3 September, 2026
0.6in
Wet Days September
5/21 (24%)

Climate (2021–2025)

Washington/Dulles International Airport, DC (4.3 miles)

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Annual Average 2021–2025
34.9in
Monthly Average 2021–2026
3in
Daily Average 2021–2026
0.1in
Wettest Day 25 October, 2021
2.4in

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