Point Forecast Matrices
Issued by NWS Tiyan, Guam
Issued by NWS Tiyan, Guam
677 FOMY50 PGUM 180621 PFMGUM Point Forecast Matrices National Weather Service Tiyan GU 421 PM ChST Tue Aug 18 2026 GUZ001-181800- Guam International Airport-Tiyan GU 13.48N 144.79E Elev. 248 ft 421 PM ChST Tue Aug 18 2026 Date Tue 08/18/26 Wed 08/19/26 Thu 08/20/26 Fri ChST3hrly 13 16 19 22 01 04 07 10 13 16 19 22 01 04 07 10 13 16 19 22 01 04 UTC 3hrly 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 Min/Max 76 87 77 87 77 Temp 82 79 77 76 77 83 87 86 84 82 79 78 78 83 87 86 84 82 79 78 Dewpt 77 77 77 76 77 78 78 78 79 79 79 78 78 79 79 79 79 79 79 78 RH 85 94100100100 85 75 77 85 91100100100 88 77 80 85 91100100 Wind dir N N N N N N N N N NE NE NE NE NE NE NE NE NE NE NE Wind spd 5 5 5 5 8 10 11 11 9 6 5 5 5 6 6 5 4 3 2 1 Clouds B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 PoP 12hr 40 40 40 30 30 QPF 12hr 0.18 0.19 0.13 0.12 0.07 Rain shwrs C C C C C C C C C C C C C C C C S S S S Tstms S S S S S S S S S S S S S S S S Heat index 90 84 92100 99 96 91 94101100 96 92 Max heat 98 97 92 100 98 90 94 101 99 90 Date 08/21/26 Sat 08/22/26 Sun 08/23/26 Mon 08/24/26 Tue 08/25/26 ChST6hrly 10 16 22 04 10 16 22 04 10 16 22 04 10 16 22 04 10 16 UTC 6hrly 00 06 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00 06 Max/Min 88 78 87 77 87 77 86 79 85 Temp 84 87 83 79 83 86 82 78 83 86 82 78 82 86 84 83 84 85 Dewpt 79 78 79 79 79 78 79 78 79 79 79 78 79 79 79 79 79 79 PWind dir N W SW SW SW SW SW SW SW Wind char LT LT GN GN GN GN GN GN GN Avg clouds B1 B1 B1 B1 B1 B1 B2 B2 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 PoP 12hr 20 30 40 40 40 40 40 40 40 Rain shwrs S S C C C C C C C C C C C C C C C C Tstms S S S S S S S S S S S S S S S S $$ MPZ001-181800- Rota International Airport-Sinapalu MP 14.17N 145.23E Elev. 592 ft 421 PM ChST Tue Aug 18 2026 Date Tue 08/18/26 Wed 08/19/26 Thu 08/20/26 Fri ChST3hrly 13 16 19 22 01 04 07 10 13 16 19 22 01 04 07 10 13 16 19 22 01 04 UTC 3hrly 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 Min/Max 75 86 76 86 76 Temp 81 78 76 75 76 81 86 85 83 80 78 76 77 82 86 85 83 80 78 76 Dewpt 77 78 76 75 76 78 78 79 79 79 78 76 77 79 79 79 79 79 78 76 RH 88100100100100 91 77 82 88 97100100100 91 80 82 88 97100100 Wind dir N N N N N N N N NE NE NE NE NE NE NE NE NE NE NE NE Wind spd 6 5 5 6 9 11 12 12 11 9 8 6 6 8 8 6 6 5 4 3 Clouds B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 PoP 12hr 30 40 40 30 30 QPF 12hr 0.11 0.16 0.14 0.15 0.10 Rain shwrs C C C C C C C C C C C C C C C C S S S S Tstms S S S S S S S S S S S S S S S S Heat index 88 90 98 97 94 89 92 99 98 94 89 Max heat 97 96 90 98 97 85 92 99 97 85 Date 08/21/26 Sat 08/22/26 Sun 08/23/26 Mon 08/24/26 Tue 08/25/26 ChST6hrly 10 16 22 04 10 16 22 04 10 16 22 04 10 16 22 04 10 16 UTC 6hrly 00 06 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00 06 Max/Min 86 76 86 76 86 77 84 79 83 Temp 82 85 80 76 82 85 80 76 82 85 81 78 81 84 84 83 83 83 Dewpt 79 79 79 76 79 79 79 76 79 79 79 78 79 79 79 79 79 79 PWind dir N W SW SW SW SW SW SW SW Wind char LT LT GN GN GN GN GN GN GN Avg clouds B1 B1 B1 B1 B1 B1 B2 B2 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 PoP 12hr 20 30 40 40 40 40 40 40 40 Rain shwrs S S C C C C C C C C C C C C C C C C Tstms S S S S S S S S S S S S S S S S $$ MPZ002-181800- Tinian-San Jose MP 14.97N 145.63E Elev. 74 ft 421 PM ChST Tue Aug 18 2026 Date Tue 08/18/26 Wed 08/19/26 Thu 08/20/26 Fri ChST3hrly 13 16 19 22 01 04 07 10 13 16 19 22 01 04 07 10 13 16 19 22 01 04 UTC 3hrly 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 Min/Max 75 87 77 87 77 Temp 81 79 77 75 76 82 87 86 84 82 79 78 78 83 87 86 84 82 79 78 Dewpt 78 78 77 75 76 78 78 79 79 79 79 78 78 79 79 79 79 80 79 78 RH 91 97100100100 88 75 80 85 91100100100 88 77 80 85 94100100 Wind dir N N N N N N NE NE NE NE NE NE NE NE NE NE NE NE NE NE Wind spd 6 5 5 6 8 10 11 11 11 10 9 8 9 9 9 9 8 6 5 4 Clouds B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 PoP 12hr 30 40 40 30 30 QPF 12hr 0.23 0.23 0.17 0.20 0.17 Rain shwrs C C C C C C C C C C C C C C C C S S S S Tstms S S S S S S S S S S S S S S S S Heat index 90 92100 99 96 92 94101100 97 92 Max heat 98 97 92 100 99 90 94 101 99 91 Date 08/21/26 Sat 08/22/26 Sun 08/23/26 Mon 08/24/26 Tue 08/25/26 ChST6hrly 10 16 22 04 10 16 22 04 10 16 22 04 10 16 22 04 10 16 UTC 6hrly 00 06 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00 06 Max/Min 87 77 87 77 87 77 86 79 85 Temp 83 86 82 78 83 86 82 78 83 86 82 78 82 85 84 83 84 85 Dewpt 79 79 79 78 79 79 79 78 79 79 79 78 79 79 79 79 79 79 PWind dir NE NW W SW SW SW SW SW SW Wind char LT LT GN GN GN GN GN GN GN Avg clouds B1 B1 B1 B1 B2 B2 B2 B2 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 PoP 12hr 20 30 50 50 40 40 40 40 40 Rain shwrs S S C C C C C C C C C C C C C C C C Tstms S S S S S S S S S S S S S S S S $$ MPZ003-181800- Saipan International Airport-Obyan MP 15.11N 145.72E Elev. 215 ft 421 PM ChST Tue Aug 18 2026 Date Tue 08/18/26 Wed 08/19/26 Thu 08/20/26 Fri ChST3hrly 13 16 19 22 01 04 07 10 13 16 19 22 01 04 07 10 13 16 19 22 01 04 UTC 3hrly 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 Min/Max 75 87 77 87 77 Temp 81 79 77 75 76 82 87 86 84 82 79 78 78 83 87 86 84 82 79 78 Dewpt 78 78 77 75 76 78 79 79 79 79 79 78 78 79 79 79 79 80 79 78 RH 91 97100100100 88 77 80 85 91100100100 88 77 80 85 94100100 Wind dir NE N N N N NE NE NE NE NE NE NE NE NE NE NE NE NE NE NE Wind spd 6 5 5 6 9 10 11 11 11 10 9 8 9 10 10 9 8 6 5 4 Clouds B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 PoP 12hr 30 40 40 30 30 QPF 12hr 0.23 0.22 0.16 0.20 0.16 Rain shwrs C C C C C C C C C C C C C C C C S S S S Tstms S S S S S S S S S S S S S S S S Heat index 90 92100 99 96 92 94101100 97 92 Max heat 98 97 92 100 99 90 94 101 99 90 Date 08/21/26 Sat 08/22/26 Sun 08/23/26 Mon 08/24/26 Tue 08/25/26 ChST6hrly 10 16 22 04 10 16 22 04 10 16 22 04 10 16 22 04 10 16 UTC 6hrly 00 06 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00 06 Max/Min 87 77 87 77 87 77 86 79 85 Temp 83 86 82 78 83 86 82 78 83 86 82 78 82 85 84 83 84 85 Dewpt 79 79 79 78 79 79 79 78 79 79 79 78 79 79 79 79 79 79 PWind dir NE NW W SW SW SW SW SW SW Wind char LT LT GN GN GN GN GN GN GN Avg clouds B1 B1 B1 B1 B2 B2 B2 B2 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 PoP 12hr 20 30 50 50 40 40 40 40 40 Rain shwrs S S C C C C C C C C C C C C C C C C Tstms S S S S S S S S S S S S S S S S $$