Pasadena climate
Pasadena (Texas, United States) has a humid subtropical climate (Köppen Cfa). The average temperature over the year is 21 °C70 °F, and about 1,466 mm58 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Pasadena climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin | Frost days |
|---|---|---|---|---|---|
| Jan | 1661 | 846 | 1254 | 1094.3 | 1 |
| Feb | 1864 | 1050 | 1457 | 702.8 | 1 |
| Mar | 2170 | 1356 | 1763 | 893.5 | 0 |
| Apr | 2576 | 1763 | 2170 | 953.7 | 0 |
| May | 2883 | 2171 | 2577 | 1234.8 | 0 |
| Jun | 3188 | 2577 | 2882 | 1495.9 | 0 |
| Jul | 3289 | 2678 | 2984 | 1385.4 | 0 |
| Aug | 3290 | 2679 | 2984 | 1666.5 | 0 |
| Sep | 3086 | 2475 | 2780 | 1736.8 | 0 |
| Oct | 2780 | 1966 | 2373 | 1435.6 | 0 |
| Nov | 2271 | 1457 | 1864 | 983.9 | 0 |
| Dec | 1864 | 1049 | 1457 | 1134.5 | 0 |
| Year | 3290 | 846 | 2170 | 1,46658 | 2 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total. Frost days are for the whole grid cell.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 82% | 59% | 2.9 | 10:26 |
| Feb | 83% | 64% | 3.3 | 11:06 |
| Mar | 82% | 60% | 4.5 | 11:55 |
| Apr | 80% | 57% | 5.3 | 12:51 |
| May | 78% | 51% | 6.0 | 13:38 |
| Jun | 76% | 44% | 6.3 | 14:02 |
| Jul | 77% | 47% | 6.1 | 13:52 |
| Aug | 75% | 44% | 5.9 | 13:12 |
| Sep | 77% | 44% | 5.0 | 12:18 |
| Oct | 76% | 36% | 4.4 | 11:24 |
| Nov | 79% | 47% | 3.3 | 10:37 |
| Dec | 82% | 59% | 2.6 | 10:15 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Pasadena is like
The warmest month is August, with an average high of 32 °C90 °F and a low of 26 °C79 °F. The coldest is January, when highs average 16 °C61 °F and lows 8 °C46 °F. There is a clear seasonal cycle, with 17.1 °C30.7 °F between the average temperature of the warmest and the coolest month.
It is wet, with about 1,466 mm58 in of precipitation per year. The wettest three-month stretch is August–October, which brings 33% of the annual total. The wettest month is September (173 mm6.8 in), the driest is February (70 mm2.8 in).
Relative humidity ranges from 75% in August to 83% in February. The clearest skies (lowest average cloud amount, 36%) are typical of October. Average wind speed near the ground ranges from 10 km/h (6 mph) in August to 14 km/h (8 mph) in April. Daylight lasts from about 10.2 hours in December to 14.0 hours in June.
Best time to visit Pasadena
Based on these averages, the most comfortable months for sightseeing and outdoor activities are February–April and November. Average highs then reach 18 °C64 °F to 25 °C76 °F. Precipitation is 70 mm2.8 in to 98 mm3.9 in per month.
The most challenging month is August, which is hot, with average highs of 32 °C90 °F and very wet (166 mm6.5 in).
Comfort score: months are ranked by how close they come to an ideal. That means an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Pasadena
- Winter (December–February) — highs 1661 to 18 °C64 °F, lows 846 to 10 °C50 °F, about 97 mm3.8 in of precipitation a month. Pack long sleeves, a sweater and a medium jacket and an umbrella or light rain jacket.
- Spring (March–May) — highs 2170 to 28 °C83 °F, lows 1356 to 21 °C71 °F, about 102 mm4.0 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and an umbrella or light rain jacket.
- Summer (June–August) — highs 3188 to 32 °C90 °F, lows 2577 to 26 °C79 °F, about 151 mm6.0 in of precipitation a month. Pack very light, breathable clothing, a sun hat and plenty of water and an umbrella or light rain jacket.
- Autumn (September–November) — highs 2271 to 30 °C86 °F, lows 1457 to 24 °C75 °F, about 138 mm5.4 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and an umbrella or light rain jacket.
How Pasadena compares
The nearest larger place is Houston, about 17 km to the northwest. Compared with it, Pasadena is on average 0.6 °C1.1 °F warmer. It receives 18% more precipitation (1,466 mm58 in vs 1,247 mm49 in). The difference is largest in December (1.7 °C3.1 °F warmer).
World Climates covers 222 places in the United States. By annual mean temperature, Pasadena is the 17th warmest of them. By annual precipitation, it is the 8th wettest. See all of them on the United States climate page.
Some places in other countries have a very similar pattern of temperature and rainfall. The closest matches are Putian (China, Cfa), Quanzhou (China, Cfa) and Fuzhou (China, Cfa).
The same NASA POWER grid cell also contains Pearland (pop. 108,821). Their long-term averages in this dataset are essentially the same as for Pasadena, so they do not have separate pages.
Nearby places
- Climate in Houston 17 km · 21 °C69 °F · 1,247 mm49 in
- Climate in Beaumont 115 km · 21 °C69 °F · 1,509 mm59 in
- Climate in College Station 150 km · 20 °C68 °F · 1,069 mm42 in
- Climate in Austin 252 km · 20 °C69 °F · 840 mm33 in
- Climate in Waco 278 km · 20 °C67 °F · 946 mm37 in
- Climate in Killeen 289 km · 20 °C67 °F · 831 mm33 in
- Climate in Tyler 296 km · 18 °C65 °F · 1,179 mm46 in
- Climate in Corpus Christi 299 km · 23 °C73 °F · 718 mm28 in
Frequently asked questions
What is the warmest month in Pasadena?
August is the warmest month in Pasadena. Its average high is 32 °C (90 °F) and its average low is 26 °C (79 °F).
What is the coldest month in Pasadena?
January is the coldest month. Its average high is 16 °C (61 °F) and its average low is 8 °C (46 °F).
When does it rain the most in Pasadena?
September is the wettest month with about 173 mm (6.8 in) of precipitation. February is the driest with about 70 mm (2.8 in).
What is the best time to visit Pasadena?
Judging by long-term averages, the most comfortable months are February–April and November.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station. So they can differ from airport records. The gaps are largest on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.