# Climate Insights for Rio Grande City

*Source: [Airpult](https://airpult.com/climate/us/rio-grande-city/0705418794): Starr County, Texas, United States*

The climate in Rio Grande City is warm and mild. The average annual temperature is 25°C and approximately 493mm of precipitation falls per year. September is the wettest month, receiving around 74mm of rainfall. Rio Grande City is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, June. The coldest months are January, December, February, when temperatures can drop to 11°C.

## Key insights

- **Hottest month:** August (peak 38°C)
- **Coldest month:** January (low 11°C)
- **Wettest month:** September (74 mm)
- **Best time to visit:** January, February, March

## Monthly climate data

The table below shows monthly climate averages for Rio Grande City based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.

| Month | Avg low (°C) | Avg high (°C) | Mean (°C) | Precip (mm) | Wind (km/h) | Snow (cm) |
| --- | ---: | ---: | ---: | ---: | ---: | ---: |
| Jan | 11 | 23 | 16 | 22 | 15 | 0 |
| Feb | 13 | 26 | 19 | 16 | 16 | 0 |
| Mar | 18 | 30 | 23 | 32 | 18 | 0 |
| Apr | 20 | 32 | 25 | 38 | 19 | 0 |
| May | 24 | 35 | 28 | 68 | 19 | 0 |
| Jun | 25 | 36 | 30 | 63 | 18 | 0 |
| Jul | 26 | 37 | 31 | 55 | 20 | 0 |
| Aug | 26 | 38 | 31 | 32 | 18 | 0 |
| Sep (current) | 25 | 35 | 29 | 74 | 14 | 0 |
| Oct | 20 | 32 | 26 | 25 | 14 | 0 |
| Nov | 16 | 27 | 21 | 43 | 14 | 0 |
| Dec | 13 | 24 | 18 | 23 | 14 | 0 |

## Temperature

Temperatures in Rio Grande City vary considerably across the year, with a 27°C difference between the coldest and warmest months. August is the hottest month, with daytime highs reaching 38°C and an average of 31°C. January is the coolest month, with minimum temperatures around 11°C and an average of 16°C. On average, daily temperatures fluctuate by about 12°C between overnight lows and afternoon highs. The sharpest temperature change occurs between October and November, with a 5°C shift in average temperatures.

## Precipitation

Rio Grande City is a relatively dry area, receiving approximately 493mm of precipitation annually, which averages out to around 41mm per month. The wettest month is September, averaging 74mm of rainfall. May and June also tend to see above-average precipitation. The driest month is February, with just 16mm. That's 57mm less than September, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall.

## Wind

Rio Grande City is mildly breezy, with an average annual wind speed of 17km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is July, averaging 20km/h, though still comfortable for most outdoor activities. The calmest conditions occur in December, with average winds dropping to 14km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 6km/h gap between the calmest and windiest months. Wind tends to pick up during the summer months. The seasonal averages are 15km/h in winter, 19km/h in spring, 19km/h in summer, 14km/h in autumn.

## Seasons

Currently it is **summer** (astronomical) / **fall** (meteorological) in Rio Grande City.
Autumn begins September 23, 2026 (8 days from now).

| Season | Begins |
| --- | --- |
| Spring | March 20 |
| Summer | June 21 |
| Autumn | September 23 |
| Winter | December 21 |

It is currently summer in Rio Grande City, which began on June 21, 2026. Rio Grande City is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in August at around 38°C, while the coldest stretch bottoms out in January near 11°C. Autumn is next, beginning on September 23, 2026 (8 days from now).

### Spring

Temperatures range from 18 to 35°C. Rainfall is relatively light, with around 139mm over the season and a monthly average of 46mm. Winds are moderate at around 19km/h. Light layers work well as temperatures warm through the season. It is a great time to be outdoors.

### Summer

Temperatures range from 25 to 38°C. Rainfall is relatively light, with around 150mm over the season and a monthly average of 50mm. Winds are moderate at around 19km/h. Stay hydrated, wear sun protection, and seek shade during the hottest hours of the day.

### Autumn

Temperatures range from 16 to 35°C. Rainfall is relatively light, with around 142mm over the season and a monthly average of 47mm. Winds are generally light, averaging 14km/h. Layered clothing works best as temperatures gradually cool. Enjoy the crisp air and changing scenery.

### Winter

Temperatures range from 11 to 26°C. Rainfall is relatively light, with around 62mm over the season and a monthly average of 21mm. Winds are moderate at around 15km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.

## Best time to visit

Recommended months: January, February, March, November, December.

The best time to visit Rio Grande City is during January, February, March, November and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 19°C with modest rainfall averaging 27mm per month. By contrast, August can be uncomfortably hot with temperatures reaching 38°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.