Helotes
United States · 18 May 2018
Average
27.5°C
low 20.6°C · high 35.3°C
Rainfall
0mm
dry day
Wind
4.2m/s
daily average
Humidity
55.5%
daily average
Cloud
38%
cover
Pressure
1008hPa
daily average
The temperature ranged from 20.6°C around 07:00 to 35.3°C around 16:00. No measurable rain was recorded during the day.
How unusual was this day?
Compared against the same 135 calendar days (±7 days) across the other 9 years on file.
High temperature
87th percentile
Low temperature
54th percentile
Rainfall
24th percentile
Wind
75th percentile
A percentile of 100 means this was the hottest/wettest/windiest of the comparable days on file; 50 is right in the middle. This window's average temperature was 25°C, versus 27.5°C on this specific day.
Sun & daylight
Sunrise
06:40
Sunset
20:22
Day length
13h 42m
Hour by hour
Temperature (line) and hourly rainfall (bars), local time — America/Chicago.
Cumulative rainfall through the day.
| Local time | UTC | Temp | Feels | Rain mm | Wind m/s | Dir | Humidity % | Pressure hPa |
|---|---|---|---|---|---|---|---|---|
| 00:00 | 05:00 | 26.1°C | 25.4°C | 0 | 4.3 | SSE | 57 | 1010 |
| 01:00 | 06:00 | 25°C | 24.6°C | 0 | 3.8 | SSE | 60 | 1010 |
| 02:00 | 07:00 | 24.4°C | 24°C | 0 | 3.6 | SSE | 61 | 1010 |
| 03:00 | 08:00 | 24.1°C | 24.2°C | 0 | 3.2 | SSE | 65 | 1010 |
| 04:00 | 09:00 | 22.5°C | 22.9°C | 0 | 2.8 | SSE | 71 | 1009 |
| 05:00 | 10:00 | 21°C | 22.2°C | 0 | 2.3 | SSE | 83 | 1009 |
| 06:00 | 11:00 | 20.6°C | 21.7°C | 0 | 2.6 | S | 86 | 1009 |
| 07:00 | 12:00 | 20.6°C | 21.7°C | 0 | 2.7 | SSE | 88 | 1009 |
| 08:00 | 13:00 | 21.4°C | 22.4°C | 0 | 3.1 | SSE | 86 | 1010 |
| 09:00 | 14:00 | 22.5°C | 23.5°C | 0 | 3.3 | S | 81 | 1010 |
| 10:00 | 15:00 | 26.4°C | 26.2°C | 0 | 3.6 | S | 56 | 1010 |
| 11:00 | 16:00 | 28°C | 27.5°C | 0 | 4.1 | SSE | 51 | 1010 |
| 12:00 | 17:00 | 29.7°C | 28.4°C | 0 | 4.4 | SSE | 42 | 1009 |
| 13:00 | 18:00 | 31.7°C | 30.4°C | 0 | 4.5 | SSE | 38 | 1008 |
| 14:00 | 19:00 | 32.9°C | 31.5°C | 0 | 4.4 | SSE | 35 | 1008 |
| 15:00 | 20:00 | 33.9°C | 32.1°C | 0 | 4.4 | SSE | 30 | 1007 |
| 16:00 | 21:00 | 35.3°C | 32.2°C | 0 | 5 | SSE | 24 | 1006 |
| 17:00 | 22:00 | 34.1°C | 32.6°C | 0 | 5.2 | SE | 35 | 1005 |
| 18:00 | 23:00 | 33.8°C | 31.4°C | 0 | 6.2 | SE | 34 | 1005 |
| 19:00 | 00:00 | 33.1°C | 30.5°C | 0 | 6 | SE | 34 | 1005 |
| 20:00 | 01:00 | 32.1°C | 29.4°C | 0 | 6.1 | SE | 36 | 1005 |
| 21:00 | 02:00 | 30.3°C | 28.4°C | 0 | 6 | SE | 44 | 1007 |
| 22:00 | 03:00 | 26.2°C | 26°C | 0 | 5.1 | SE | 66 | 1008 |
| 23:00 | 04:00 | 24.7°C | 24.5°C | 0 | 5 | SE | 71 | 1009 |
Nearby cities
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Data source & coverage — ERA5 reanalysis, 2016–2025 (10 years)details
- Source
- ERA5 reanalysis, accessed via the Copernicus Climate Change Service (C3S) Climate Data Store
- Data type
- Reanalysis — a physically consistent reconstruction combining a forecast model with historical observations, not a live station reading or a forecast
- Coverage
- 2016–2025 (10 years) for United States
- Location
- Helotes — 29.500°, -98.750°, ERA5 grid cell center, 10.5 km from requested point
- Time zone
- America/Chicago
- What's shown here
- The hourly and daily record for 18 May 2018 specifically — not a monthly average. See the Helotes climate overview for typical conditions.
- Spatial resolution
- 0.25° (~25 km) distributed grid — ERA5's native model resolution is finer; this is the publicly distributed regridded product
- Version / refreshed
- Methodology v2026.07 · data last refreshed December 31, 2025
- Limitations
- A model reconstruction, not a station observation — hyper-local extremes (a single storm cell, an urban heat pocket) can differ from a nearby gauge. See the full methodology.
- Attribution
- Generated using Copernicus Climate Change Service information
Cite this data
PastClimate (2026-07-21). Historical climate data for Helotes, United States (29.50°N, 98.75°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Helotes, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 21, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Helotes, United States." PastClimate, derived from ERA5 (Copernicus Climate Change Service), July 21, 2026, www.pastclimate.com.
@misc{pastclimate,
author = {PastClimate},
title = {Historical climate data for Helotes, United States},
year = {2026},
note = {Derived from ERA5 (Hersbach et al., 2023), Copernicus Climate Change Service. Accessed 2026-07-21},
url = {https://www.pastclimate.com/}
}Notice something wrong with this data? Report a data issue.