Umatilla National Forest Rainfall Forecast

Today 29 May
40%
Sat 30 May
No Rain
Sun 31 May
No Rain
Mon 1 Jun
No Rain
Tue 2 Jun
No Rain
Wed 3 Jun
15%
Thu 4 Jun
5%

Umatilla National Forest Rainfall Statistics

May Rainfall

Grant County Regional Airport (35.4 miles)

Total Rainfall 2026
9.5in
Daily Average 2026
0.1in
Wettest Day 8 February, 2026
1.1in
Wet Days 2026
35/149 (23%)
Total Rainfall April
2.6in
Daily Average April
0.1in
Wettest Day 12 April, 2026
0.7in
Wet Days April
9/30 (30%)
Total Rainfall May
0.7in
Daily Average May
0.04in
Wettest Day 26 May, 2026
0.7in
Wet Days May
3/29 (10%)

Climate (2010–Present)

Grant County Regional Airport (35.4 miles)

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Annual Average 2021–2025
16.5in
Monthly Average 2021–2026
1.5in
Daily Average 2021–2026
0.1in
Wettest Day 5 December, 2025
1.2in

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