Point Forecast Matrices
Issued by NWS Tiyan, Guam
Issued by NWS Tiyan, Guam
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203 FOMY50 PGUM 201811 PFMGUM Point Forecast Matrices National Weather Service Tiyan GU 410 AM ChST Mon Sep 21 2026 GUZ001-210600- Guam International Airport-Tiyan GU 13.48N 144.79E Elev. 248 ft 410 AM ChST Mon Sep 21 2026 Date Mon 09/21/26 Tue 09/22/26 Wed 09/23/26 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 88 77 87 77 86 Temp 78 83 87 87 85 82 79 78 78 83 86 86 84 81 79 78 78 82 86 85 Dewpt 78 78 78 78 78 78 78 78 78 78 78 78 79 79 79 78 78 78 78 78 RH 100 85 75 75 80 88 97100100 85 77 77 85 94100100100 88 77 80 Wind dir E SE SE S S S S S SE SE S S S S S S S S S S Wind spd 1 5 6 6 3 3 2 1 2 8 8 8 5 3 3 4 5 10 10 9 Clouds B1 B1 B1 B1 B1 B1 B1 B1 B2 B2 B2 B2 OV OV OV OV B2 B2 B2 B2 PoP 12hr 50 40 60 60 60 QPF 12hr 0.15 0.15 0.30 0.40 0.29 Rain shwrs C C C C C C C C L L L L L L L L 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 93100 99 96 91 84 93 99 98 95 91 84 92 98 97 Max heat 93 100 99 89 93 99 97 89 92 98 Date Thu 09/24/26 Fri 09/25/26 Sat 09/26/26 Sun 09/27/26 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 78 86 77 86 77 86 78 86 Temp 81 78 83 85 81 78 82 85 81 78 82 85 82 78 83 85 Dewpt 79 78 78 78 79 78 79 79 79 78 78 79 79 78 78 78 PWind dir SW SW SW W W W NW NW Wind char LT LT LT LT LT LT LT LT Avg clouds B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 B1 B1 B1 B1 B1 B1 PoP 12hr 50 40 50 50 50 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 $$ MPZ001-210600- Rota International Airport-Sinapalu MP 14.17N 145.23E Elev. 592 ft 410 AM ChST Mon Sep 21 2026 Date Mon 09/21/26 Tue 09/22/26 Wed 09/23/26 ChST3hrly 01 04 07 10 13 16 19 22 01 04 07 10 13 16 19 22 01 04 07 10 13 16 UTC 3hrly 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 Max/Min 88 77 87 77 86 Temp 77 83 88 87 85 82 79 77 78 83 87 86 84 81 79 77 78 82 86 85 Dewpt 77 78 78 78 78 78 78 77 78 78 78 78 79 79 79 77 78 78 79 79 RH 100 85 72 75 80 88 97100100 85 75 77 85 94100100100 88 80 82 Wind dir SE SE SE SE SE SE SE SE SE SE SE S S SE S S S S S S Wind spd 5 9 10 10 9 8 6 6 8 12 12 12 10 9 9 10 12 16 14 13 Clouds B1 B1 B1 B1 B1 B1 B1 B1 B2 B2 B2 B2 B2 B2 B2 B2 B1 B1 B1 B1 PoP 12hr 40 30 50 50 40 QPF 12hr 0.12 0.12 0.21 0.30 0.31 Rain shwrs C C C C C C C C C C C C C C C C C C C C Tstms S S S S S S S S S S S S S S S S Heat index 93101100 96 91 93100 99 95 91 92 98 98 Max heat 93 101 99 89 93 100 98 89 92 98 Date Thu 09/24/26 Fri 09/25/26 Sat 09/26/26 Sun 09/27/26 ChST6hrly 22 04 10 16 22 04 10 16 22 04 10 16 22 04 10 16 UTC 6hrly 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00 06 Min/Max 77 86 76 86 77 86 78 86 Temp 81 77 82 85 81 77 82 85 81 77 82 85 82 78 83 85 Dewpt 79 77 79 79 79 77 79 79 79 77 78 78 78 78 78 78 PWind dir S SW W W W W NW N Wind char GN GN LT GN LT GN LT GN Avg clouds B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 B1 B1 B1 B2 PoP 12hr 50 50 40 50 50 40 40 40 Rain shwrs C C C C C C C C C C C C C C C C Tstms S S S S S S S S S S $$ MPZ002-210600- Tinian-San Jose MP 14.97N 145.63E Elev. 74 ft 410 AM ChST Mon Sep 21 2026 Date Mon 09/21/26 Tue 09/22/26 Wed 09/23/26 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 88 78 88 78 87 Temp 79 84 88 87 85 83 80 79 79 84 88 87 85 83 80 79 79 84 87 87 Dewpt 78 78 78 78 78 78 78 78 78 78 79 79 79 79 79 79 79 79 79 79 RH 97 82 72 75 80 85 94 97 97 82 75 77 82 88 97100100 85 77 77 Wind dir E E SE SE SE SE SE SE SE SE SE SE SE SE SE SE SE SE S S Wind spd 5 8 10 10 9 9 9 6 9 11 11 11 10 10 9 10 11 11 11 10 Clouds B1 B1 B1 B1 B1 B1 B1 B1 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 PoP 12hr 40 30 50 50 50 QPF 12hr 0.24 0.13 0.15 0.24 0.39 Rain shwrs C C C C S S S S 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 Heat index 95102101 97 92 87 95102101 98 93 88 95101100 Max heat 95 102 100 91 95 102 100 91 95 101 Date Thu 09/24/26 Fri 09/25/26 Sat 09/26/26 Sun 09/27/26 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 78 88 78 87 78 87 78 87 Temp 82 79 84 87 82 79 83 86 82 79 83 86 82 79 83 86 Dewpt 79 79 79 79 79 79 79 78 79 78 78 78 78 78 78 78 PWind dir S S W W NW SW NE E Wind char LT LT LT LT LT LT LT LT Avg clouds B2 B1 B1 B1 B2 B2 B2 B2 B1 B1 B1 B1 B1 B1 B1 B1 PoP 12hr 40 40 50 50 40 40 40 30 Rain shwrs C C C C C C C C C C C C C C C C Tstms S S S S $$ MPZ003-210600- Saipan International Airport-Obyan MP 15.11N 145.72E Elev. 215 ft 410 AM ChST Mon Sep 21 2026 Date Mon 09/21/26 Tue 09/22/26 Wed 09/23/26 ChST3hrly 01 04 07 10 13 16 19 22 01 04 07 10 13 16 19 22 01 04 07 10 13 16 UTC 3hrly 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 Max/Min 88 78 88 78 87 Temp 79 84 88 87 85 83 80 79 79 84 88 87 85 83 80 78 79 84 87 87 Dewpt 78 78 78 79 78 79 78 78 78 78 79 79 79 79 79 78 79 79 79 79 RH 97 82 72 77 80 88 94 97 97 82 75 77 82 88 97100100 85 77 77 Wind dir E E SE SE SE SE SE SE SE SE SE SE SE SE SE SE SE SE S S Wind spd 5 9 11 11 9 9 8 6 8 11 12 11 9 9 8 9 10 12 12 10 Clouds B1 B1 B1 B1 B1 B1 B1 B1 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 PoP 12hr 40 30 50 50 50 QPF 12hr 0.16 0.14 0.15 0.19 0.36 Rain shwrs C C C C S S S S C C C C C C C C C C C C Tstms S S S S S S S S S S S S S S S S Heat index 95102101 97 93 88 95102101 98 93 88 95101100 Max heat 95 102 100 91 95 102 100 91 95 101 Date Thu 09/24/26 Fri 09/25/26 Sat 09/26/26 Sun 09/27/26 ChST6hrly 22 04 10 16 22 04 10 16 22 04 10 16 22 04 10 16 UTC 6hrly 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00 06 Min/Max 78 88 78 87 78 87 78 87 Temp 82 79 84 87 82 78 83 86 82 78 83 86 82 79 83 86 Dewpt 79 79 79 79 79 78 79 78 78 78 78 78 78 78 78 78 PWind dir S S W W NW S NE E Wind char LT LT LT LT LT LT LT LT Avg clouds B2 B2 B1 B1 B2 B2 B2 B1 B1 B1 B1 B2 B1 B1 B1 B1 PoP 12hr 40 40 50 50 40 40 40 40 Rain shwrs C C C C C C C C C C C C C C C C Tstms S S S S $$