Mammoth Rainfall Forecast

Today 19 Sep
75%
Sun 20 Sep
60%
Mon 21 Sep
5%
Tue 22 Sep
No Rain
Wed 23 Sep
15%
Thu 24 Sep
5%
Fri 25 Sep
5%

Mammoth Rainfall Statistics

September Rainfall

West Yellowstone (28 miles)

Total Rainfall 2026
6.5in
Daily Average 2026
0.04in
Wettest Day 9 June, 2026
0.9in
Wet Days 2026
41/262 (16%)
Total Rainfall August
1.6in
Daily Average August
0.1in
Wettest Day 14 August, 2026
0.5in
Wet Days August
8/31 (26%)
Total Rainfall September
0.3in
Daily Average September
0.02in
Wettest Day 1 September, 2026
0.2in
Wet Days September
3/19 (16%)

Climate (2021–2025)

West Yellowstone (28 miles)

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Annual Average 2021–2025
6.7in
Monthly Average 2021–2026
1in
Daily Average 2021–2026
0.04in
Wettest Day 2 August, 2022
1.8in

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