★ January30° · ☂ 18 ★ February30° · ☂ 13 March 31° · ☂ 15 April 31° · ☂ 16 May 32° · ☂ 17 June 31° · ☂ 19 July 31° · ☂ 22 August 31° · ☂ 23 September 31° · ☂ 24 October 31° · ☂ 24 November 31° · ☂ 20 ★ December30° · ☂ 19 Guam in July:hot, rain nearly every day Guam · Records from 2006 to 2025. Not a forecast.
Mean high 31° Hottest day 32.2° (2016)
Mean low 25° Coldest night 23.7° (2008)
Rain days 22 days 16-28 by year
Rainfall 314mm Daylight 12.9 → 12.7 h
Guam's 12 months i Best: December to February
1 2 3 4 5 6 7 8 9 10 11 12
Trip types Beach Poorfrequent rain Sightseeing on foot Poorhot, frequent rain and muggy
Humidity 83% 31 muggy days
Clear days 1 day 21 overcast days
Mean wind 19 km/h 2 windy days
Sea temperature 29.7° 29.5-29.8° by year (last 6)
Sunrise / sunset (15th) 06:01 / 18:52 Daylight 12.9 → 12.7 h
Guam in July The wet season begins, and sudden downpours become common. Liberation Day on 21 July marks the 1944 American recapture of the island, with a large parade in Hagatna. Typhoons can arrive from July to mid-November.
Days averaged 31°C and nights 25°C. Midday was for air conditioning, a cold drink or a long lunch out of the sun. Rain fell on more than half the days: 22 on average. It varied a lot from year to year. July 2007 had 16 rain days; 2018 had 28.
With 30 days above 30°C on average, most of the month felt like high summer.
Typhoons i 3 of the last 20 years had a tropical storm pass within 300 km this month.
Maria (2018), 13 km away typhoon strength Chan-Hom (2015), 63 km away tropical storm Halong (2014), 66 km away tropical storm 1 1 2 1 3 2 4 3 5 1 6 3 7 4 8 4 9 6 10 4 11 1 12
Date by date i Sun
Mon
Tue
Wed
Thu
Fri
Sat
Week
July 1 Thursday 1 rain in 14 of 20 yrs 14/20 31° 25° July 2 Friday 2 rain in 15 of 20 yrs 15/20 31° 25° July 3 Saturday 3 rain in 15 of 20 yrs 15/20 31° 25° 1-3 rain on 73% of days 31° 25°
July 4 Sunday 4 rain in 14 of 20 yrs 14/20 31° 25° July 5 Monday 5 rain in 13 of 20 yrs 13/20 31° 25° July 6 Tuesday 6 rain in 16 of 20 yrs 16/20 31° 25° July 7 Wednesday 7 rain in 16 of 20 yrs 16/20 31° 25° July 8 Thursday 8 rain in 12 of 20 yrs 12/20 31° 25° July 9 Friday 9 rain in 17 of 20 yrs 17/20 31° 25° July 10 Saturday 10 rain in 14 of 20 yrs 14/20 31° 25° 4-10 rain on 73% of days 31° 25°
July 11 Sunday 11 rain in 15 of 20 yrs 15/20 31° 25° July 12 Monday 12 rain in 14 of 20 yrs 14/20 31° 25° July 13 Tuesday 13 rain in 14 of 20 yrs 14/20 31° 25° July 14 Wednesday 14 rain in 12 of 20 yrs 12/20 31° 25° July 15 Thursday 15 rain in 10 of 20 yrs 10/20 31° 25° July 16 Friday 16 rain in 13 of 20 yrs 13/20 31° 25° July 17 Saturday 17 rain in 12 of 20 yrs 12/20 31° 25° 11-17 rain on 64% of days 31° 25°
July 18 Sunday 18 rain in 15 of 20 yrs 15/20 31° 25° July 19 Monday 19 rain in 17 of 20 yrs 17/20 31° 25° July 20 Tuesday 20 rain in 15 of 20 yrs 15/20 31° 25° July 21 Wednesday 21 rain in 15 of 20 yrs 15/20 31° 25° July 22 Thursday 22 rain in 14 of 20 yrs 14/20 31° 25° July 23 Friday 23 rain in 14 of 20 yrs 14/20 31° 25° July 24 Saturday 24 rain in 16 of 20 yrs 16/20 31° 25° 18-24 rain on 76% of days 31° 25°
July 25 Sunday 25 rain in 15 of 20 yrs 15/20 31° 25° July 26 Monday 26 rain in 17 of 20 yrs 17/20 31° 25° July 27 Tuesday 27 rain in 17 of 20 yrs 17/20 31° 25° July 28 Wednesday 28 rain in 16 of 20 yrs 16/20 31° 25° July 29 Thursday 29 rain in 15 of 20 yrs 15/20 31° 25° July 30 Friday 30 rain in 13 of 20 yrs 13/20 31° 25° July 31 Saturday 31 rain in 13 of 20 yrs 13/20 31° 25° 25-31 rain on 76% of days 31° 25°
Rain was common on almost every date this month, so the shades compare dates within this month.
1-3 rain on 73% of days 31° 25° 4-10 rain on 73% of days 31° 25° 11-17 rain on 64% of days 31° 25° 18-24 rain on 76% of days 31° 25° 25-31 rain on 76% of days 31° 25°
Sun
Mon
Tue
Wed
Thu
Fri
Sat
Week
July 1 Saturday 1 rain in 14 of 20 yrs 14/20 31° 25° July 1 rain on 70% of days 31° 25°
July 2 Sunday 2 rain in 15 of 20 yrs 15/20 31° 25° July 3 Monday 3 rain in 15 of 20 yrs 15/20 31° 25° July 4 Tuesday 4 rain in 14 of 20 yrs 14/20 31° 25° July 5 Wednesday 5 rain in 13 of 20 yrs 13/20 31° 25° July 6 Thursday 6 rain in 16 of 20 yrs 16/20 31° 25° July 7 Friday 7 rain in 16 of 20 yrs 16/20 31° 25° July 8 Saturday 8 rain in 12 of 20 yrs 12/20 31° 25° 2-8 rain on 72% of days 31° 25°
July 9 Sunday 9 rain in 17 of 20 yrs 17/20 31° 25° July 10 Monday 10 rain in 14 of 20 yrs 14/20 31° 25° July 11 Tuesday 11 rain in 15 of 20 yrs 15/20 31° 25° July 12 Wednesday 12 rain in 14 of 20 yrs 14/20 31° 25° July 13 Thursday 13 rain in 14 of 20 yrs 14/20 31° 25° July 14 Friday 14 rain in 12 of 20 yrs 12/20 31° 25° July 15 Saturday 15 rain in 10 of 20 yrs 10/20 31° 25° 9-15 rain on 69% of days 31° 25°
July 16 Sunday 16 rain in 13 of 20 yrs 13/20 31° 25° July 17 Monday 17 rain in 12 of 20 yrs 12/20 31° 25° July 18 Tuesday 18 rain in 15 of 20 yrs 15/20 31° 25° July 19 Wednesday 19 rain in 17 of 20 yrs 17/20 31° 25° July 20 Thursday 20 rain in 15 of 20 yrs 15/20 31° 25° July 21 Friday 21 rain in 15 of 20 yrs 15/20 31° 25° July 22 Saturday 22 rain in 14 of 20 yrs 14/20 31° 25° 16-22 rain on 72% of days 31° 25°
July 23 Sunday 23 rain in 14 of 20 yrs 14/20 31° 25° July 24 Monday 24 rain in 16 of 20 yrs 16/20 31° 25° July 25 Tuesday 25 rain in 15 of 20 yrs 15/20 31° 25° July 26 Wednesday 26 rain in 17 of 20 yrs 17/20 31° 25° July 27 Thursday 27 rain in 17 of 20 yrs 17/20 31° 25° July 28 Friday 28 rain in 16 of 20 yrs 16/20 31° 25° July 29 Saturday 29 rain in 15 of 20 yrs 15/20 31° 25° 23-29 rain on 79% of days 31° 25°
July 30 Sunday 30 rain in 13 of 20 yrs 13/20 31° 25° July 31 Monday 31 rain in 13 of 20 yrs 13/20 31° 25°
30-31 rain on 65% of days 31° 25°
Rain was common on almost every date this month, so the shades compare dates within this month.
July 1 rain on 70% of days 31° 25° 2-8 rain on 72% of days 31° 25° 9-15 rain on 69% of days 31° 25° 16-22 rain on 72% of days 31° 25° 23-29 rain on 79% of days 31° 25° 30-31 rain on 65% of days 31° 25°
Tap another date to change
2006 82mm
2007 55mm
2008 10mm
2009 14mm
2010 2mm
2011 6mm
2012 1mm
2013 none
2014 6mm
2015 8mm
2016 21mm
2017 7mm
2018 none
2019 1mm
2020 1mm
2021 5mm
2022 21mm
2023 19mm
2024 none
2025 10mm
Holidays in July (2027) July 3 to July 5 Independence Day long weekendJuly 21 Liberation DayJuly 3 to July 5 Independence Day weekend 1 Local public holiday or break (busier, pricier)1 US holidays (flights fill up)
Your trip dates, the past 20 years Trip dates July 1 (Thu) 2 (Fri) 3 (Sat) 4 (Sun) 5 (Mon) 6 (Tue) 7 (Wed) 8 (Thu) 9 (Fri) 10 (Sat) 11 (Sun) 12 (Mon) 13 (Tue) 14 (Wed) 15 (Thu) 16 (Fri) 17 (Sat) 18 (Sun) 19 (Mon) 20 (Tue) 21 (Wed) 22 (Thu) 23 (Fri) 24 (Sat) 25 (Sun) 26 (Mon) 27 (Tue) 28 (Wed) 29 (Thu) 30 (Fri) 31 (Sat) ~ July 1 (Thu) 2 (Fri) 3 (Sat) 4 (Sun) 5 (Mon) 6 (Tue) 7 (Wed) 8 (Thu) 9 (Fri) 10 (Sat) 11 (Sun) 12 (Mon) 13 (Tue) 14 (Wed) 15 (Thu) 16 (Fri) 17 (Sat) 18 (Sun) 19 (Mon) 20 (Tue) 21 (Wed) 22 (Thu) 23 (Fri) 24 (Sat) 25 (Sun) 26 (Mon) 27 (Tue) 28 (Wed) 29 (Thu) 30 (Fri) 31 (Sat) 1-7 8-14 15-21 22-end Whole month
You can also click two dates on the axis. Hover a cell to see that day's rain. By year Driest trips first
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Trip rain days Month rain days Tap a date to start, tap another to end. Each cell is that date in one year. '06 '07 '08 '09 '10 '11 '12 '13 '14 '15 '16 '17 '18 '19 '20 '21 '22 '23 '24 '25
of 20 Dates outside your trip are dimmed.
One row per year, one cell per day. 2007 had 16 rain days, 2018 had 28.
Guam through the year Month High Low Rain days Rainfall Sea January Good 30° 24° 18 days 163mm 29° February Good 30° 24° 13 days 100mm 28° March 31° 24° 15 days 91mm 28° April 31° 25° 16 days 104mm 29° May 32° 25° 17 days 139mm 29° June 31° 25° 19 days 155mm 30° July 31° 25° 22 days 314mm 30° August 31° 25° 23 days 451mm 30° September 31° 25° 24 days 444mm 30° October 31° 25° 24 days 427mm 30° November 31° 25° 20 days 186mm 30° December Good 30° 25° 19 days 121mm 29°
What to pack Loose linen or quick-dry cotton, a wide-brimmed hat and sunscreen were the basics. A water bottle stayed in the bag, and midday plans moved indoors.
Quick-dry fabrics and a spare pair of socks made the wet days painless. An umbrella handles drizzle; a hooded jacket handles the rest.
Common questions Does it rain a lot in Guam in July? Over the past 20 years July averaged 22 rain days (1 mm or more) out of 31. Individual years ran from 16 in the driest to 28 in the wettest.
What should I wear in Guam in July? Days averaged 31°C and nights 25°C. Pack an umbrella, sandals that can get wet, T-shirts, sunscreen plus a hat, a swimsuit, and insect repellent.
Can you swim in Guam in July? Sea surface temperature averaged 29.7°C in July, warm enough to stay in for a long swim. Year to year it ranged 29.5-29.8°C. Check local flags for waves and jellyfish on the day.
Is July a good time to visit Guam? On warmth and rain days alone, Guam's easiest months were December to February. July ranked 8 of 12.
Is Guam humid in July? Mean relative humidity was 83%, with about 31 muggy days (dew point of 20°C or more) in the month.
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