Point Forecast Matrices
Issued by NWS Tiyan, Guam
Issued by NWS Tiyan, Guam
842 FOMY50 PGUM 151806 PFMGUM Point Forecast Matrices National Weather Service Tiyan GU 405 AM ChST Wed Sep 16 2026 GUZ001-160600- Guam International Airport-Tiyan GU 13.48N 144.79E Elev. 248 ft 405 AM ChST Wed Sep 16 2026 Date Wed 09/16/26 Thu 09/17/26 Fri 09/18/26 ChST3hrly 01 04 07 10 13 16 19 22 01 04 07 10 13 16 19 22 01 04 07 10 13 16 UTC 3hrly 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 Max/Min 87 78 87 79 87 Temp 77 83 87 86 84 82 80 79 79 83 87 86 85 83 81 79 80 84 87 86 Dewpt 77 79 79 79 79 79 79 79 79 79 79 79 79 80 80 79 79 79 79 79 RH 100 88 77 80 85 91 97100100 88 77 80 82 91 97100 97 85 77 80 Wind dir W W W W W W W W W W W W W W W W W SW W W Wind spd 8 9 10 11 10 9 8 8 9 10 12 12 11 10 10 10 12 14 16 16 Clouds B2 B2 B2 B2 B2 B2 B2 B2 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 PoP 12hr 50 50 50 40 40 QPF 12hr 0.14 0.21 0.18 0.14 0.18 Rain shwrs C C C C 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 S S S S Heat index 93100100 97 93 87 95101100 98 94 90 85 87 96101100 Max heat 93 100 99 91 95 101 100 93 96 101 Date Sat 09/19/26 Sun 09/20/26 Mon 09/21/26 Tue 09/22/26 ChST6hrly 22 04 10 16 22 04 10 16 22 04 10 16 22 04 10 16 UTC 6hrly 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00 06 Min/Max 79 87 79 87 79 87 79 86 Temp 83 79 84 86 83 79 84 86 83 79 84 86 83 79 83 85 Dewpt 80 79 79 79 80 79 79 79 79 79 78 78 78 78 78 78 PWind dir W SW W SW W W W W Wind char GN GN GN GN GN LT GN LT Avg clouds B1 B1 B1 B1 B1 B1 B2 B2 B2 B2 B2 B2 B2 B2 B1 B1 PoP 12hr 30 30 40 50 50 50 50 40 Rain shwrs 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 $$ MPZ001-160600- Rota International Airport-Sinapalu MP 14.17N 145.23E Elev. 592 ft 405 AM ChST Wed Sep 16 2026 Date Wed 09/16/26 Thu 09/17/26 Fri 09/18/26 ChST3hrly 01 04 07 10 13 16 19 22 01 04 07 10 13 16 19 22 01 04 07 10 13 16 UTC 3hrly 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 Max/Min 87 77 87 79 87 Temp 76 82 87 86 84 82 79 78 78 83 87 86 85 83 81 79 80 84 87 86 Dewpt 76 79 79 79 79 79 79 78 78 79 79 79 80 80 80 79 79 79 79 79 RH 100 91 77 80 85 91100100100 88 77 80 85 91 97100 97 85 77 80 Wind dir W W W W W W W W W W W W W W W W W SW SW SW Wind spd 6 6 9 10 9 8 6 6 8 9 10 11 10 9 9 9 10 12 13 13 Clouds B2 B2 B2 B2 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 PoP 12hr 50 50 40 40 40 QPF 12hr 0.21 0.10 0.05 0.04 0.06 Rain shwrs C C C C C C C C C C C C C C C C C C C C Tstms S S S S S S S S S S S S S S S S S S S S Heat index 92101100 97 92 94101101 98 94 90 85 86 96101101 Max heat 92 101 99 90 94 101 100 93 96 101 Date Sat 09/19/26 Sun 09/20/26 Mon 09/21/26 Tue 09/22/26 ChST6hrly 22 04 10 16 22 04 10 16 22 04 10 16 22 04 10 16 UTC 6hrly 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00 06 Min/Max 79 87 79 87 78 86 79 84 Temp 83 79 84 86 83 79 84 86 82 79 83 85 82 79 82 83 Dewpt 80 79 79 79 79 79 79 79 79 79 79 78 79 79 79 79 PWind dir SW SW SW SW W W W W Wind char GN GN GN LT LT LT LT LT Avg clouds B1 B1 B1 B1 B1 B1 B2 B2 B2 B2 B2 B2 B2 B1 B1 B1 PoP 12hr 30 30 40 40 40 40 40 40 Rain shwrs C C C C C C C C C C C C C C C C Tstms S S S S S S S S S S S S S S S S $$ MPZ002-160600- Tinian-San Jose MP 14.97N 145.63E Elev. 74 ft 405 AM ChST Wed Sep 16 2026 Date Wed 09/16/26 Thu 09/17/26 Fri 09/18/26 ChST3hrly 01 04 07 10 13 16 19 22 01 04 07 10 13 16 19 22 01 04 07 10 13 16 UTC 3hrly 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 Max/Min 87 77 87 79 87 Temp 77 83 87 86 84 82 79 78 78 83 87 86 85 83 81 79 80 84 87 86 Dewpt 77 79 79 79 80 80 79 78 78 79 79 80 80 80 80 79 80 80 79 79 RH 100 88 77 80 88 94100100100 88 77 82 85 91 97100100 88 77 80 Wind dir NW NW NW NW W W W W W W W W W W W W SW SW SW SW Wind spd 6 6 8 9 9 9 8 8 9 10 11 12 11 10 10 10 11 13 14 14 Clouds B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 PoP 12hr 60 40 30 30 30 QPF 12hr 0.18 0.04 0.03 0.03 0.03 Rain shwrs C C C C C C C C C C C C C C C C C C C C Tstms S S S S Heat index 94101100 97 92 94101101 98 94 91 85 87 96101101 Max heat 94 101 100 90 94 102 100 93 96 101 Date Sat 09/19/26 Sun 09/20/26 Mon 09/21/26 Tue 09/22/26 ChST6hrly 22 04 10 16 22 04 10 16 22 04 10 16 22 04 10 16 UTC 6hrly 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00 06 Min/Max 79 87 79 87 78 87 79 87 Temp 83 79 84 86 83 79 84 86 82 79 84 86 83 79 84 86 Dewpt 80 79 79 79 79 79 79 79 79 79 78 79 79 79 79 79 PWind dir SW SW SW SW W SW W W Wind char GN GN LT LT LT LT LT LT Avg clouds B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 PoP 12hr 30 30 30 30 40 40 40 40 Rain shwrs 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 $$ MPZ003-160600- Saipan International Airport-Obyan MP 15.11N 145.72E Elev. 215 ft 405 AM ChST Wed Sep 16 2026 Date Wed 09/16/26 Thu 09/17/26 Fri 09/18/26 ChST3hrly 01 04 07 10 13 16 19 22 01 04 07 10 13 16 19 22 01 04 07 10 13 16 UTC 3hrly 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 Max/Min 87 77 87 79 87 Temp 77 83 87 86 84 82 79 78 78 83 87 86 85 83 81 79 80 84 87 86 Dewpt 77 80 79 79 80 80 79 78 78 79 79 80 80 80 80 79 80 80 80 79 RH 100 91 77 80 88 94100100100 88 77 82 85 91 97100100 88 80 80 Wind dir NW N NW NW W W W W W W W W W W W W SW SW SW SW Wind spd 8 8 8 8 9 9 8 8 9 10 12 12 12 10 10 10 12 13 14 14 Clouds B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 PoP 12hr 60 40 30 30 30 QPF 12hr 0.18 0.05 0.03 0.03 0.04 Rain shwrs C C C C C C C C C C C C C C C C C C C C Tstms S S S S Heat index 94101100 97 92 94101101 98 94 91 85 87 96102101 Max heat 94 101 100 90 94 101 100 93 96 102 Date Sat 09/19/26 Sun 09/20/26 Mon 09/21/26 Tue 09/22/26 ChST6hrly 22 04 10 16 22 04 10 16 22 04 10 16 22 04 10 16 UTC 6hrly 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00 06 Min/Max 79 87 79 87 79 87 79 87 Temp 83 79 84 86 83 79 84 86 83 79 84 86 83 79 84 86 Dewpt 80 79 79 79 79 79 79 79 79 79 79 79 79 79 79 79 PWind dir SW SW SW SW SW SW W W Wind char GN GN LT LT LT LT LT LT Avg clouds B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 PoP 12hr 30 30 30 30 40 40 40 40 Rain shwrs C C C C C C C C C C C C C C C C Tstms S S S S S S S S S S S S $$