Climate and Average Weather Year Round in Cần Giờ Vietnam

In Cần Giờ, the wet season is hot and overcast; the dry season is warm, windy, and partly cloudy; and it is oppressive year round. Over the course of the year, the temperature typically varies from 73°F to 90°F and is rarely below 69°F or above 93°F.

Based on the beach/pool score, the best time of year to visit Cần Giờ for hot-weather activities is from mid December to late March.

The temperature in Cần Giờ varies so little throughout the year that it is not entirely meaningful to discuss hot and cold seasons.

In Cần Giờ, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.

The clearer part of the year in Cần Giờ begins around November 19 and lasts for 4.8 months, ending around April 12.

The clearest month of the year in Cần Giờ is February, during which on average the sky is clear, mostly clear, or partly cloudy 45% of the time.

The cloudier part of the year begins around April 12 and lasts for 7.2 months, ending around November 19.

The cloudiest month of the year in Cần Giờ is June, during which on average the sky is overcast or mostly cloudy 92% of the time.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Cần Giờ varies very significantly throughout the year.

The wetter season lasts 6.1 months, from May 6 to November 10, with a greater than 33% chance of a given day being a wet day. The month with the most wet days in Cần Giờ is September, with an average of 17.7 days with at least 0.04 inches of precipitation.

The drier season lasts 5.9 months, from November 10 to May 6. The month with the fewest wet days in Cần Giờ is February, with an average of 0.6 days with at least 0.04 inches of precipitation.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone in Cần Giờ is September, with an average of 17.7 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 63% on September 25.

Rainfall

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Cần Giờ experiences extreme seasonal variation in monthly rainfall.

The rainy period of the year lasts for 9.1 months, from March 24 to December 28, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain in Cần Giờ is September, with an average rainfall of 7.1 inches.

The rainless period of the year lasts for 2.9 months, from December 28 to March 24. The month with the least rain in Cần Giờ is February, with an average rainfall of 0.2 inches.

The length of the day in Cần Giờ does not vary substantially over the course of the year, staying within 44 minutes of 12 hours throughout. In 2024, the shortest day is December 21, with 11 hours, 31 minutes of daylight; the longest day is June 21, with 12 hours, 44 minutes of daylight.

The earliest sunrise is at 5:29 AM on May 30, and the latest sunrise is 46 minutes later at 6:15 AM on January 28. The earliest sunset is at 5:26 PM on November 16, and the latest sunset is 52 minutes later at 6:18 PM on July 13.

Daylight saving time (DST) is not observed in Cần Giờ during 2024.

The figure below presents a compact representation of key lunar data for 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases.

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

The perceived humidity level in Cần Giờ, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, staying within 4% of 96% throughout.

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed in Cần Giờ experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 4.0 months, from December 20 to April 20, with average wind speeds of more than 10.7 miles per hour. The windiest month of the year in Cần Giờ is February, with an average hourly wind speed of 13.2 miles per hour.

The calmer time of year lasts for 8.0 months, from April 20 to December 20. The calmest month of the year in Cần Giờ is October, with an average hourly wind speed of 8.4 miles per hour.

The predominant average hourly wind direction in Cần Giờ varies throughout the year.

The wind is most often from the south for 2.1 weeks, from May 6 to May 21, with a peak percentage of 43% on May 15. The wind is most often from the west for 4.6 months, from May 21 to October 8, with a peak percentage of 85% on August 7. The wind is most often from the east for 6.9 months, from October 8 to May 6, with a peak percentage of 87% on January 1.

Cần Giờ is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average water temperature experiences some seasonal variation over the course of the year.

The time of year with warmer water lasts for 2.2 months, from April 18 to June 23, with an average temperature above 84°F. The month of the year in Cần Giờ with the warmest water is May, with an average temperature of 85°F.

The time of year with cooler water lasts for 2.4 months, from December 21 to March 2, with an average temperature below 80°F. The month of the year in Cần Giờ with the coolest water is January, with an average temperature of 78°F.

To characterize how pleasant the weather is in Cần Giờ throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Cần Giờ for general outdoor tourist activities is from late December to early March, with a peak score in the second week of February.

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Cần Giờ for hot-weather activities is from mid December to late March, with a peak score in the last week of February.

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

Temperatures in Cần Giờ are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy experiences some seasonal variation over the course of the year.

The brighter period of the year lasts for 2.4 months, from February 2 to April 13, with an average daily incident shortwave energy per square meter above 6.1 kWh. The brightest month of the year in Cần Giờ is March, with an average of 6.6 kWh.

The darker period of the year lasts for 5.2 months, from May 17 to October 24, with an average daily incident shortwave energy per square meter below 4.4 kWh. The darkest month of the year in Cần Giờ is June, with an average of 3.9 kWh.

For the purposes of this report, the geographical coordinates of Cần Giờ are 10.411 deg latitude, 106.955 deg longitude, and 16 ft elevation.

The topography within 2 miles of Cần Giờ is essentially flat, with a maximum elevation change of 43 feet and an average elevation above sea level of 3 feet. Within 10 miles is essentially flat (837 feet). Within 50 miles contains very significant variations in elevation (2,789 feet).

The area within 2 miles of Cần Giờ is covered by water (64%), cropland (14%), and mangroves (14%), within 10 miles by water (66%) and mangroves (21%), and within 50 miles by water (50%) and cropland (30%).