Question 1

Which season was the wettest in Houston in 2025?

Accepted Answer

Summer (June to August) was by far the wettest season in Houston in 2025, delivering roughly **755 mm (29.7 in)** of rain — nearly half of the city's annual total.

Across the 2025 calendar year, Houston recorded about 1,587 mm (62.5 in) of precipitation. Summer 2025 (JJA) accounted for 755 mm (29.7 in) of that, more than double the next-wettest season, spring 2025 (March to May) at 350 mm (13.8 in). Autumn 2025 (September to November) brought 259 mm (10.2 in), while the winter months within 2025 (January and February) were the driest stretch at just 223 mm (8.8 in).

The summer total was driven largely by June 2025, the single wettest month of the year with 350 mm (13.8 in) of rain, followed by August at 238 mm (9.4 in) and July at 167 mm (6.6 in). For context, December 2025 was the driest month of all, with only 49 mm (1.9 in).

This pattern reflects Houston's humid subtropical climate, where warm, moist Gulf air fuels heavy summer downpours and thunderstorms. If you're planning outdoor events or travel to Houston, the drier and more comfortable windows fall in late autumn and early winter, while summer visitors should expect frequent, intense rainfall and pack accordingly.

Question 2

What was the hottest day in Houston in 2025?

Accepted Answer

The hottest day in Houston in 2025 was **August 20**, when the temperature peaked at **36.7°C (98.1°F)**. This was the single highest daily maximum recorded anywhere in the year for Houston.

On that record day, conditions were intensely warm from morning to night. The daily mean temperature reached 28.4°C (83.1°F), the overnight low only dipped to 21.8°C (71.2°F), and average humidity sat at 73.5% — making the heat feel even more oppressive than the air temperature alone suggests.

August 20 narrowly edged out a cluster of other scorching days. June 8 came in a close second at 36.6°C (97.9°F), with July 30 and August 18 also topping 36°C (97°F). Notably, Houston did not record a single day reaching 37.8°C (100°F) in 2025.

The wider picture shows just how consistently hot Houston gets:

- **29 days** reached or exceeded 35°C (95°F) during 2025.
- **136 days** — well over a third of the year — hit 32.2°C (90°F) or higher.
- The summer months (June–August) averaged a daily high of 33.7°C (92.7°F).

For visitors and residents, this means peak summer in Houston demands real heat precautions. The combination of high temperatures and steady humidity around the August 20 record makes midday outdoor activity strenuous, so early mornings, evenings, and air-conditioned breaks are the practical way to stay comfortable during Houston's hottest stretches.

Question 3

What is the annual temperature range in Houston?

Accepted Answer

Houston has a wide annual temperature range, swinging from a low of -9.0°C (15.8°F) in January 2025 to a peak of 36.7°C (98.1°F) in August 2025 — an overall spread of about 45.7°C (82.3°F) across the year.

Across 2025, Houston's average temperature settled at 21.4°C (70.6°F), reflecting its humid subtropical climate. The warmest month was August, with a monthly mean of 28.1°C (82.6°F), while January was the coldest, averaging just 9.4°C (48.9°F). That gives a month-to-month swing of roughly 18.7°C (33.7°F) between the warmest and coldest parts of the year.

Looking at the seasonal pattern in Houston, the data shows three distinct stages:

- **Summer (June–August 2025):** Hot and steady, with monthly means of 27.4–28.1°C (81.3–82.6°F) and highs touching 36.7°C (98.1°F).
- **Winter (January–February 2025):** The coolest stretch, with means of 9.4–14.6°C (48.9–58.3°F) and occasional cold snaps dipping below freezing.
- **Spring and autumn:** Transitional and mild, generally between 18°C and 26°C (64–79°F).

These figures show that while Houston is warm for much of the year, it is far from uniform. Visitors should pack for genuine heat in summer but bring a warm layer for winter, when brief cold outbreaks can push temperatures below 0°C (32°F). The mildest, most comfortable conditions in Houston tend to fall in spring and autumn.

Question 4

What is the sunniest time of year in Houston?

Accepted Answer

The sunniest time of year in Houston is late summer into early autumn, with **August** standing out as the brightest month of 2025 at 336.2 hours of sunshine — roughly 10.8 hours of sun per day.

Across 2025, Houston recorded 2,716 hours of sunshine in total, averaging about 226 hours per month. The peak stretch runs from July through October, when high-pressure conditions keep skies clear: August led with 336.2 hours, followed by September (295.6 hours, about 9.9 hours/day) and July (283.3 hours, about 9.1 hours/day). October stayed bright too, with 272.1 hours.

The dimmest period falls in mid-winter, when February dropped to just 129.8 hours and January to 151.8 hours — less than half of August's total. Spring offered a sunny rebound, with March reaching 241.5 hours.

For visitors and residents planning sun-dependent activities, this means Houston's brightest days cluster in the warmer half of the year, though peak summer sunshine arrives alongside the city's heat and humidity. If you want abundant sun with milder temperatures, **October 2025** was a sweet spot in Houston: 272 hours of sunshine paired with a comfortable average of 22.9°C (73.2°F), making it one of the most pleasant sunny months on the calendar.

Question 5

How humid does Houston get throughout the year?

Accepted Answer

Houston is consistently humid all year, with an average relative humidity of 75.2% across 2025. The city's coastal, subtropical setting keeps moisture levels high in every season.

Humidity peaked in June 2025 at 80.2%, while the driest air arrived in March 2025 at 67.4%. Even that low point reflects a fairly muggy climate, and humidity in Houston stayed at or above 75% in 5 of the 12 months. Summer was the stickiest stretch: during the meteorological summer of June to August 2025 (June 1 to August 31), average humidity reached 79.1%.

This high moisture pairs with intense heat. Across the same summer months, Houston averaged 27.8°C (82.0°F), and August 2025 saw daily highs climb to 36.7°C (98.1°F). The combination of high humidity and high temperature is what makes Houston summers feel far hotter than the thermometer alone suggests.

For visitors and residents, the practical takeaway is to plan for muggy conditions year-round in Houston. Outdoor activity is most comfortable in the cooler, slightly drier months, while summer calls for hydration, light clothing, and air conditioning. Because humidity rarely dips far even in winter, the "heat index" effect is a defining feature of Houston's weather rather than a seasonal exception.

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FAQ

Which season was the wettest in Houston in 2025?

What was the hottest day in Houston in 2025?

What is the annual temperature range in Houston?

What is the sunniest time of year in Houston?

How humid does Houston get throughout the year?