Tamuning, Guam experiences average highs of 28°C (82°F) and lows of 26°C (79°F) throughout the year. Rainfall is frequent, averaging about 20 rainy days per month. Sunshine is abundant, averaging about 10 hours per day. High humidity combined with warm temperatures produces a tropical feel year-round. Average highs have stayed broadly stable across the available records.
Tamuning, Guam Weather & Climate 2026
Monthly climate averages for Tamuning, Guam. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Jan–Dec 
Wetter season: Jun–Nov At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
5.2/10
Best: January, February, March, April
UV Index
8
High
Temperature 28°C / 26°C
Feels Like 32°C / 28°C
Rainy Days 20
Rainfall 179 mm
Sunshine 10 h
Humidity 81%
Wind Speed 29 km/h
Dew Point 24°C
Hottest Month
29°C
June
Avg Low27°C
Rain20days
Coldest Month
26°C
February
Avg High27°C
Rain12days
Driest Month
12days
February
Avg High27°C
Avg Low26°C
Windiest Month
36 km/h
February (Gusts 49)
Sea Temperature
28°C – 30°C
Warmest water: August (
30°C
)
Worst Time to Visit
Consider avoiding June, July, August, September due to heavy rainfall, oppressive humidity.
Sun Position
Sunrise 05:55
Daylight 12.9h
Sunset 18:50
Live conditions—
Tamuning on the map · live conditions
Tamuning, Guam
- Continent
- Oceania
- Country
- Guam
- City
- Tamuning
- Population
- 19.7K
- Elevation
- 13 m
- Coordinates
- 13.49°, 144.78°
Seasonal Breakdown
Spring
Mar–May
Avg High 28°C
Avg Low 26°C
Rain 13 days/mo
2/3 best months
Summer
Jun–Aug
Avg High 29°C
Avg Low 27°C
Rain 26 days/mo
Autumn
Sep–Nov
Avg High 29°C
Avg Low 26°C
Rain 27 days/mo
Winter
Dec–Feb
Avg High 28°C
Avg Low 26°C
Rain 15 days/mo
2/3 best months
Climate Charts
Based on historical averages (2016–2025)
Monthly Temperatures
HighLowShaded bands show the typical range across the available yearly records.
Line chart showing monthly temperatures. Jan: 28°C / 26°C . Feb: 27°C / 26°C . Mar: 28°C / 26°C . Apr: 28°C / 26°C . May: 29°C / 27°C . Jun: 29°C / 27°C . Jul: 29°C / 27°C . Aug: 29°C / 26°C . Sep: 29°C / 26°C . Oct: 29°C / 26°C . Nov: 29°C / 27°C . Dec: 28°C / 27°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 70 mm. Feb: 60 mm. Mar: 44 mm. Apr: 83 mm. May: 95 mm. Jun: 155 mm. Jul: 273 mm. Aug: 361 mm. Sep: 369 mm. Oct: 359 mm. Nov: 183 mm. Dec: 101 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 78%. Feb: 78%. Mar: 79%. Apr: 80%. May: 81%. Jun: 82%. Jul: 83%. Aug: 84%. Sep: 83%. Oct: 84%. Nov: 82%. Dec: 80%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 34 km/h . Feb: 36 km/h . Mar: 31 km/h . Apr: 30 km/h . May: 28 km/h . Jun: 26 km/h . Jul: 26 km/h . Aug: 24 km/h . Sep: 25 km/h . Oct: 27 km/h . Nov: 32 km/h . Dec: 35 km/h .
Sunshine
Sunshine
Sunshine: Jan: 10h. Feb: 11h. Mar: 11h. Apr: 11h. May: 12h. Jun: 11h. Jul: 10h. Aug: 9h. Sep: 9h. Oct: 9h. Nov: 10h. Dec: 10h.
Sea Temperature
Sea Temperature
Line chart showing monthly sea temperature. Jan: 29°C . Feb: 28°C . Mar: 28°C . Apr: 29°C . May: 29°C . Jun: 30°C . Jul: 30°C . Aug: 30°C . Sep: 30°C . Oct: 30°C . Nov: 29°C . Dec: 29°C .
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 7. Feb: UV 8. Mar: UV 9. Apr: UV 9. May: UV 8. Jun: UV 8. Jul: UV 8. Aug: UV 8. Sep: UV 8. Oct: UV 8. Nov: UV 7. Dec: UV 7.
Monthly Daylight Hours
Daylight12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy
Climate Trends
Average highs have stayed broadly stable across the available records. Average rainfall is trending wetter by about 20 mm.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | May 2025 · 29°C | Jun · 29°C |
| Coldest month | Feb 2025 · 26°C | Feb · 26°C |
| Wettest month | Sep 2025 · 375 mm | Sep · 369 mm |
| Windiest month | Feb 2025 · 35 km/h | Feb · 36 km/h |
Month-by-Month Weather Table
January best
Good 
February best
Good March best
Good April best
Good May
Fair June
Wet July
Wet August
Wet September
Wet October
Wet November
Wet December
Wet | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January best | 28°C / 26°C | 29°C / 27°C | 15days (70 mm) Wet | 10.4h Excellent | 78% Humid | 7 High | Good | View Details |
| February best | 27°C / 26°C | 29°C / 26°C | 12days (60 mm) Wet | 10.6h Excellent | 78% Humid | 8.1 Very High | Good | View Details |
| March best | 28°C / 26°C | 31°C / 27°C | 12days (44 mm) Wet | 10.9h Excellent | 79% Humid | 9 Very High | Good | View Details |
| April best | 28°C / 26°C | 32°C / 28°C | 13days (83 mm) Wet | 11.1h Excellent | 80% Humid | 9.2 Very High | Good | View Details |
| May | 29°C / 27°C | 33°C / 29°C | 15days (95 mm) Wet | 11.5h Excellent | 81% Humid | 8.4 Very High | Fair | View Details |
| June | 29°C / 27°C | 33°C / 30°C | 20days (155 mm) Wet | 11h Excellent | 82% Humid | 8.4 Very High | Wet | View Details |
| July | 29°C / 27°C | 33°C / 30°C | 29days (273 mm) Wet | 9.8h Good | 83% Humid | 7.9 Very High | Wet | View Details |
| August | 29°C / 26°C | 34°C / 30°C | 29days (361 mm) Wet | 8.7h Good | 84% Humid | 8.2 Very High | Wet | View Details |
| September | 29°C / 26°C | 34°C / 30°C | 28days (369 mm) Wet | 8.7h Good | 83% Humid | 8.1 Very High | Wet | View Details |
| October | 29°C / 26°C | 33°C / 29°C | 28days (359 mm) Wet | 8.7h Good | 84% Humid | 7.8 Very High | Wet | View Details |
| November | 29°C / 27°C | 32°C / 29°C | 24days (183 mm) Wet | 9.7h Good | 82% Humid | 7.2 Very High | Wet | View Details |
| December | 28°C / 27°C | 31°C / 28°C | 19days (101 mm) Wet | 10.3h Excellent | 80% Humid | 6.9 High | Wet | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Tamuning are January, February, March, April, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Tamuning, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Tamuning is June, with average daytime highs of 29°C (84°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Tamuning is February, with average overnight lows of 26°C (78°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Tamuning is September, averaging 369mm of precipitation across 28 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Tamuning runs through July, August, September, October, with the heaviest rainfall in July. Based on 10-year averages for Tamuning.
Tamuning receives approximately 121 sunshine hours per year. The sunniest month is May with around 12 hours. Based on climate data for Tamuning.
The least favorable months to visit Tamuning are June, July, August, September, primarily due to heavy rainfall, oppressive humidity. For the best conditions, consider January, February, March, April instead.
The annual average UV index in Tamuning is 8, classified as high. SPF 30+ sunscreen, sunglasses, and seeking shade between 10:00–16:00 are strongly recommended.
Average humidity in Tamuning is 81%, classified as humid. High humidity makes warm temperatures feel significantly hotter — lightweight, breathable clothing is recommended.
Yes — sea temperatures in January, February, March, April, May, June, July, August, September, October, November, December average 29°C (84°F), which is warm and comfortable for swimming and water activities.
Average wind speeds in Tamuning are 29 km/h (18 mph). The windiest month is February with peak winds reaching 36 km/h (22 mph) (gusts up to 49 km/h / 30 mph).
Tamuning averages 2 clear-sky days per month with overall cloud cover around 64%. The clearest skies occur in May.
The annual average dew point in Tamuning is 24°C (75°F), which feels oppressively humid. Expect heavy perspiration during warmer months — stay hydrated and take breaks in air-conditioned spaces.
Tamuning has a Tropical Monsoon climate, classified as Am under the Köppen system. Tropical climates are warm year-round with high rainfall and temperatures rarely dropping below 18°C (64°F).
The 'feels like' temperature in Tamuning ranges from 28°C (82°F) to 32°C (90°F) on average. Humidity and radiant heat mean it often feels warmer than the thermometer reads, especially in summer months.
June is not the best time to visit Tamuning, with a climate score of 4/10. Consider visiting during January, February, March, April instead for better conditions.
For June in Tamuning, pack Umbrella, Waterproof jacket, Waterproof shoes, Breathable clothing, Sunscreen (SPF 30+). With average highs of 29°C (84°F) and 20 rainy days, these essentials will keep you comfortable.
Data Source
Climate data derived from ERA5 reanalysis (ECMWF), averaged over 2016–2025. Sea surface temperature from marine reanalysis data. Climate scores and seasonal estimates are computed by WorldStats.
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