Evapotranspiration Calculations
Portland Airport - September 2026 daily calculations
| Date |
Evapotrans-
piration (mm) 0000- 2400 |
Rain (mm) 0900- 0900 |
Pan Evaporation (mm) 0900- 0900 |
Max Temp |
Min Temp |
Max Rel Hum (%) |
Min Rel Hum (%) |
Average 10m Wind Speed (m/sec) |
Solar Radiation (MJ/sq m) |
| 01/09/2026 | 2.5 | 0.0 | | 18.2 | 7.8 | 97 | 53 | 6.64 | 6.43 |
| 02/09/2026 | 1.8 | 8.6 | | 13.9 | 8.7 | 91 | 68 | 5.55 | 9.36 |
| 03/09/2026 | 2.5 | 2.4 | | 14.9 | 10.2 | 97 | 57 | 8.71 | 14.19 |
| 04/09/2026 | 2.3 | 0.0 | | 16.8 | 7.6 | 88 | 62 | 4.98 | 11.67 |
| 05/09/2026 | 2.2 | 0.8 | | 15.6 | 11.0 | 95 | 68 | 9.67 | 12.22 |
| 06/09/2026 | 1.9 | 2.6 | | 15.2 | 8.4 | 97 | 68 | 5.26 | 12.08 |
| 07/09/2026 | 2.3 | 2.8 | | 14.3 | 9.5 | 97 | 57 | 3.98 | 15.84 |
| 08/09/2026 | 1.9 | 0.2 | | 14.5 | 2.1 | 96 | 67 | 4.24 | 14.70 |
| 09/09/2026 | 2.5 | 0.6 | | 13.9 | 8.7 | 82 | 54 | 5.12 | 12.97 |
| 10/09/2026 | | 0.0 | | | 5.1 | 97 | 72 | 1.71 | 17.35 |
| 11/09/2026 | | | | 16.7 | | 100 | 40 | 1.91 | 17.61 |
| 12/09/2026 | 3.0 | 0.0 | | 21.9 | 6.3 | 95 | 42 | 2.42 | 17.57 |
| 13/09/2026 | 3.3 | 0.0 | | 22.1 | 10.4 | 95 | 48 | 5.32 | 12.54 |
| 14/09/2026 | 1.9 | 0.6 | | 15.5 | 10.6 | 98 | 76 | 5.80 | 13.90 |
| 15/09/2026 | 2.7 | 3.8 | | 13.3 | 7.9 | 90 | 54 | 6.97 | 16.08 |
| Totals: | 30.8 | 22.4 | | | | | | | |
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