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West Covina climate
Typical historical weather for West Covina, United States, averaged across 10 years of hourly climate data. Pick a date for a specific day.
Data last updated: 31 December 2025
Want today's actual conditions instead? See the current forecast for West Covina. Planning a garden? See the gardening & growing season planner. Or browse the 365-day climate calendar.
Annual average
18°C
across all months
Warmest month
31°C
Aug average high
Coolest month
8.2°C
Jan average low
Annual rainfall
413mm
total per year
West Covina is typically hottest in August and coolest in January, a swing of about 22.8°C across the year. About 59% of annual rainfall falls in the three wettest months (January is typically wettest, July driest).
Monthly averages
Average daily high/low temperature (band) and monthly rainfall (bars).
| Month | Avg high | Avg low | Rainfall | Wet days | Humidity | Wind | Cloud | Solar |
|---|---|---|---|---|---|---|---|---|
| Jan | 18.3°C · record 20.4°C–30.7°C | 8.2°C · record 2.4°C–5.7°C | 86mm | 6 | 61% | 1.7 m/s | 50% | 3.1 kWh/m² |
| Feb | 19°C · record 18.4°C–30.8°C | 8.5°C · record 1.6°C–6.7°C | 79mm | 6 | 57% | 1.8 m/s | 42% | 4.1 kWh/m² |
| Mar | 19.4°C · record 21.6°C–29.7°C | 9.6°C · record 4.2°C–6.4°C | 78mm | 9 | 65% | 1.8 m/s | 51% | 5.1 kWh/m² |
| Apr | 22.4°C · record 26.1°C–36°C | 11.7°C · record 4.5°C–9.6°C | 21mm | 4 | 61% | 1.9 m/s | 44% | 6.6 kWh/m² |
| May | 23°C · record 24.6°C–36.3°C | 13.6°C · record 8°C–11.6°C | 13mm | 3 | 66% | 1.9 m/s | 46% | 7.1 kWh/m² |
| Jun | 26.9°C · record 29.2°C–41.2°C | 16.2°C · record 12°C–14.5°C | 4mm | 1 | 62% | 1.9 m/s | 33% | 8 kWh/m² |
| Jul | 30.3°C · record 31.9°C–44.1°C | 18.7°C · record 15°C–17.5°C | 1mm | 0 | 58% | 1.8 m/s | 24% | 8 kWh/m² |
| Aug | 31°C · record 33.5°C–38.9°C | 19.2°C · record 15.9°C–18.8°C | 8mm | 1 | 57% | 1.6 m/s | 23% | 7.3 kWh/m² |
| Sep | 29.4°C · record 33.7°C–44.2°C | 18.1°C · record 10.9°C–16.7°C | 8mm | 2 | 58% | 1.6 m/s | 27% | 6 kWh/m² |
| Oct | 26.8°C · record 31.8°C–38.5°C | 14.8°C · record 7.6°C–13.1°C | 12mm | 2 | 53% | 1.5 m/s | 28% | 4.8 kWh/m² |
| Nov | 22.7°C · record 24.8°C–33.5°C | 11°C · record 5°C–9.1°C | 32mm | 3 | 50% | 1.6 m/s | 38% | 3.6 kWh/m² |
| Dec | 19°C · record 22.3°C–27.5°C | 8.6°C · record 2.2°C–7.2°C | 70mm | 5 | 57% | 1.6 m/s | 49% | 2.8 kWh/m² |
"Avg high"/"Avg low" is the mean daily high/low for that month, averaged across every year on file. The "record" figure alongside it is a different statistic — the single hottest (or coldest) hour ever recorded during that month across all years — so it can sit above or below the average and does not describe the average's year-to-year spread. A "wet day" is any day with at least 1.0mm of rain.
Year to year
Annual average temperature, 2016–2025.
Across these 10 years, the annual average has moved by about -1.2°C per decade. That’s a short window for a reliable long-term climate trend — treat it as indicative, not definitive.
Annual rainfall has moved by about +220.08mm per decade over the same period.
2025 (the most recent year on file) averaged 17.8°C, below the 9-year baseline of 18.1°C by 0.54 standard deviations.
Typical extremes per year
Rainy days
40.8 days
≥1.0mm rain
Heavy rain days
5.3 days
≥20mm rain
Extreme heat days
0.8 days
daily high ≥40°C
Frost days
0 days
daily low ≤0°C
Averaged across 10 years on file. Thresholds match PastClimate's data pipeline definitions — see data & sources.
Records on file
Ranked across 10 years of data currently on file (2016–2025).
Hottest day
44.2°C
5 September 2020
2020 was 1.05 SD above the 9-year average that year
Coldest day
1.6°C
20 February 2018
2018 was 0.92 SD above the 9-year average that year
Wettest day
70.6mm
5 February 2024
2024 was 1.5 SD below the 9-year average that year
Windiest day
5.1m/s
24 February 2023
2023 was 2.11 SD below the 9-year average that year
See the detail: West Covina on 5 February 2024.
Nearby cities
Frequently asked questions about West Covina's climate
What is the hottest month in West Covina?
August is typically the warmest month in West Covina, with an average high of 31°C. January is typically the coolest, averaging 8.2°C overnight.
How much does it rain in West Covina?
West Covina gets about 413mm of rain a year on average, with roughly 59% of it falling in the three wettest months (January is typically the wettest, July the driest).
How many extremely hot or cold days does West Covina have?
On average, West Covina sees about 0.8 day(s) a year at or above 40°C and about 0 day(s) at or below 0°C, based on 10 years of data.
Is West Covina getting warmer?
Across the 10 years on file (2016–2025), the annual average temperature has moved by about -1.25°C per decade. That's a short window for a reliable long-term climate trend — treat it as indicative, not definitive.
What is the hottest day on record for West Covina?
The hottest day on file is 5 September 2020 at 44.2°C, out of 10 year(s) searched.
Data & provenance
↓ Download monthly CSVData 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
- West Covina — 34.000°, -118.000°, ERA5 grid cell center, 9.5 km from requested point
- Time zone
- America/Los_Angeles
- What's shown here
- Monthly and annual averages, and dated extreme-value records, derived from an hourly base record.
- 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 (2026-07-20). Historical climate data for West Covina, United States (34.00°N, 118.00°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for West Covina, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 20, 2026, from https://www.pastclimate.com/
"Historical Climate Data for West Covina, United States." PastClimate, derived from ERA5 (Copernicus Climate Change Service), July 20, 2026, www.pastclimate.com.
@misc{pastclimate,
author = {PastClimate},
title = {Historical climate data for West Covina, United States},
year = {2026},
note = {Derived from ERA5 (Hersbach et al., 2023), Copernicus Climate Change Service. Accessed 2026-07-20},
url = {https://www.pastclimate.com/}
}Notice something wrong with this data? Report a data issue.