Union, Philippines experiences average highs of 28°C (82°F) and lows of 26°C (79°F) throughout the year. Rainfall is frequent, averaging about 23 rainy days per month. Sunshine is abundant, averaging about 9 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.
Union, Philippines Weather & Climate 2026
Monthly climate averages for Union, Philippines. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Jan–Sep 
Wetter season: Jun–Dec At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
5/10
Best: January, February, March, April
UV Index
8
High
Temperature 28°C / 26°C
Feels Like 32°C / 29°C
Rainy Days 23
Rainfall 255 mm
Sunshine 9 h
Humidity 83%
Wind Speed 28 km/h
Dew Point 24°C
Hottest Month
29°C
May
Avg Low 27°C
Rain 21 days
Coldest Month
25°C
February
Avg High 27°C
Rain 17 days
Driest Month
11 days
April
Avg High 29°C
Avg Low 27°C
Windiest Month
36 km/h
January (Gusts 50)
Sea Temperature
27°C – 31°C
Warmest water: May (
30.5°C
)
Worst Time to Visit
Consider avoiding May, June due to heavy rainfall, oppressive humidity.
Sun Position
Sunrise 05:29
Daylight 12.8h
Sunset 18:17
Live conditions —
Union on the map · live conditions
Union, Philippines
- Continent
- Asia
- Country
- Philippines
- City
- Union
- Population
- 2.3K
- Coordinates
- 11.76°, 121.90°
Seasonal Breakdown
Spring
Mar–May
Avg High 29°C
Avg Low 27°C
Rain 15 days/mo
2/3 best months
Summer
Jun–Aug
Avg High 29°C
Avg Low 27°C
Rain 27 days/mo
Autumn
Sep–Nov
Avg High 28°C
Avg Low 26°C
Rain 27 days/mo
Winter
Dec–Feb
Avg High 27°C
Avg Low 26°C
Rain 23 days/mo
2/3 best months
Climate Charts
Based on historical averages (2016–2025)
Monthly Temperatures
High Low Shaded bands show the typical range across the available yearly records.
Line chart showing monthly temperatures. Jan: 27°C / 26°C . Feb: 27°C / 25°C . Mar: 28°C / 26°C . Apr: 29°C / 27°C . May: 29°C / 27°C . Jun: 29°C / 27°C . Jul: 29°C / 26°C . Aug: 28°C / 27°C . Sep: 28°C / 26°C . Oct: 28°C / 26°C . Nov: 28°C / 27°C . Dec: 28°C / 26°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 228 mm. Feb: 135 mm. Mar: 83 mm. Apr: 65 mm. May: 149 mm. Jun: 299 mm. Jul: 416 mm. Aug: 351 mm. Sep: 382 mm. Oct: 395 mm. Nov: 257 mm. Dec: 298 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 82%. Feb: 81%. Mar: 81%. Apr: 80%. May: 82%. Jun: 83%. Jul: 84%. Aug: 84%. Sep: 84%. Oct: 84%. Nov: 83%. Dec: 83%.
Monthly Wind Speed
Wind Speed Gusts
Bar chart showing monthly wind speed. Jan: 36 km/h . Feb: 35 km/h . Mar: 31 km/h . Apr: 27 km/h . May: 22 km/h . Jun: 21 km/h . Jul: 26 km/h . Aug: 27 km/h . Sep: 25 km/h . Oct: 25 km/h . Nov: 31 km/h . Dec: 34 km/h .
Sunshine
Sunshine
Sunshine: Jan: 9h. Feb: 10h. Mar: 11h. Apr: 11h. May: 11h. Jun: 10h. Jul: 9h. Aug: 9h. Sep: 9h. Oct: 9h. Nov: 9h. Dec: 9h.
Sea Temperature
Sea Temperature swim
Line chart showing monthly sea temperature. Jan: 28°C . Feb: 27°C . Mar: 28°C . Apr: 29°C . May: 31°C . Jun: 30°C . Jul: 30°C . Aug: 30°C . Sep: 29°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 7. Aug: UV 8. Sep: UV 7. Oct: UV 8. Nov: UV 7. Dec: UV 7.
Monthly Daylight Hours
Daylight 12h 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 116 mm.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | May 2025 · 29°C | May · 29°C |
| Coldest month | Jan 2025 · 26°C | Feb · 25°C |
| Wettest month | Aug 2025 · 644 mm | Jul · 416 mm |
| Windiest month | Jul 2025 · 36 km/h | Jan · 36 km/h |
Month-by-Month Weather Table
January best
Wet 
February best
Good March best
Good April best
Good May
Wet 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 | 27°C / 26°C | 29°C / 26°C | 23days (228 mm) Wet | 8.7h Good | 82% Humid | 6.7 High | Wet | View Details |
| February best | 27°C / 25°C | 29°C / 26°C | 17days (135 mm) Wet | 9.7h Good | 81% Humid | 7.7 Very High | Good | View Details |
| March best | 28°C / 26°C | 31°C / 27°C | 13days (83 mm) Wet | 10.7h Excellent | 81% Humid | 8.7 Very High | Good | View Details |
| April best | 29°C / 27°C | 33°C / 30°C | 11days (65 mm) Wet | 11.1h Excellent | 80% Humid | 9 Very High | Good | View Details |
| May | 29°C / 27°C | 35°C / 31°C | 21days (149 mm) Wet | 10.7h Excellent | 82% Humid | 8 Very High | Wet | View Details |
| June | 29°C / 27°C | 34°C / 31°C | 27days (299 mm) Wet | 9.7h Good | 83% Humid | 7.7 Very High | Wet | View Details |
| July | 29°C / 26°C | 33°C / 29°C | 29days (416 mm) Wet | 8.7h Good | 84% Humid | 7.2 Very High | Wet | View Details |
| August | 28°C / 27°C | 33°C / 29°C | 26days (351 mm) Wet | 9h Good | 84% Humid | 7.8 Very High | Wet | View Details |
| September | 28°C / 26°C | 33°C / 30°C | 26days (382 mm) Wet | 8.7h Good | 84% Humid | 7.4 Very High | Wet | View Details |
| October | 28°C / 26°C | 33°C / 30°C | 28days (395 mm) Wet | 8.8h Good | 84% Humid | 7.6 Very High | Wet | View Details |
| November | 28°C / 27°C | 32°C / 29°C | 27days (257 mm) Wet | 9.1h Good | 83% Humid | 7 High | Wet | View Details |
| December | 28°C / 26°C | 30°C / 28°C | 29days (298 mm) Wet | 8.6h Good | 83% Humid | 6.6 High | Wet | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Union are January, February, March, April, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Union, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Union is May, with average daytime highs of 29°C (85°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Union is February, with average overnight lows of 25°C (78°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Union is July, averaging 416mm of precipitation across 29 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Union runs through July, December, October, June, with the heaviest rainfall in July. Based on 10-year averages for Union.
Union receives approximately 113 sunshine hours per year. The sunniest month is April with around 11 hours. Based on climate data for Union.
The least favorable months to visit Union are May, June, primarily due to heavy rainfall, oppressive humidity. For the best conditions, consider January, February, March, April instead.
The annual average UV index in Union is 8, classified as high. SPF 30+ sunscreen, sunglasses, and seeking shade between 10:00–16:00 are strongly recommended.
Average humidity in Union is 83%, 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 Union are 28 km/h (17 mph). The windiest month is January with peak winds reaching 36 km/h (22 mph) (gusts up to 50 km/h / 31 mph).
Union averages 2 clear-sky days per month with overall cloud cover around 75%. The clearest skies occur in April.
The annual average dew point in Union is 24°C (75°F), which feels oppressively humid. Expect heavy perspiration during warmer months — stay hydrated and take breaks in air-conditioned spaces.
Union has a Tropical Rainforest climate, classified as Af 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 Union ranges from 29°C (84°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 Union, with a climate score of 2.3/10. Consider visiting during January, February, March, April instead for better conditions.
For June in Union, pack Umbrella, Waterproof jacket, Waterproof shoes, Breathable clothing, Sunscreen (SPF 30+). With average highs of 29°C (84°F) and 27 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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