July is one of the warmer months of the year in Belfast, with average highs near 16.7°C and lows around 12°C (mean 14.4°C). It is about average for rainfall, averaging 80 mm of rainfall and 86% relative humidity across the period.
July is one of the warmer months of the year in Belfast. Across 45 years of records, the warmest July in Belfast was 2021 — when the month averaged 16°C — while the coldest was 1993 at 13°C. Typical July days reach 16.7°C with nights near 12°C. The long-term July temperature trend is broadly flat.
July is about average for rainfall in Belfast, averaging 80 mm of rainfall. The wettest July on record was 2020 with 139 mm, while the driest was 1983 at 22 mm.
Relative humidity in Belfast during July averages 86%. The most humid July was 2003 at 88%, and the least humid was 1989 at 84%.
July receives about 4.8 kWh/m²/day of solar energy in Belfast. The sunniest July was 2013 at 5.7 kWh/m²/day, and the cloudiest was 1986 at 3.6.
Average wind speed in Belfast during July is 3.7 m/s. The windiest July was 1988 at 4.8 m/s, while the calmest was 2021 at 2.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 14.2°C | 14.3°C | 14.3°C | 14.5°C | 14.8°C | +0.6°C |
| Avg High | 16.6°C | 16.6°C | 16.5°C | 16.9°C | 17.2°C | +0.6°C |
| Avg Low | 11.8°C | 12.0°C | 12.0°C | 12.1°C | 12.4°C | +0.6°C |
| Avg Rain | 67 mm | 76 mm | 78 mm | 92 mm | 87 mm | +19 mm |
July temperatures in Belfast have risen by about 0.6°C between 1981–1985 and 2021–2025.
July has ranged from a record low of 7.4°C (1993) to a record high of 24.3°C (1983).
Rainfall in July is about average for rainfall, averaging 80 mm, with a wettest year of 139 mm.
One of the best times to visit Belfast
July is one of the best times to visit Belfast. Expect days averaging 16.7°C and nights around 12°C (mean 14.4°C) — warmer than Belfast's yearly average — with moderate rainfall (80 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 18.1°C | 15.7°C | 13.3°C | 21.5°C | 10.0°C | 80 mm | 86% | 3.5 m/s | 4.9 |
| 2024 | 16.3°C | 14.1°C | 11.8°C | 18.9°C | 9.1°C | 86 mm | 86% | 3.4 m/s | 4.6 |
| 2023 | 16.4°C | 14.3°C | 12.2°C | 18.9°C | 10.2°C | 139 mm | 87% | 4.4 m/s | 4.4 |
| 2022 | 17.6°C | 15.0°C | 12.4°C | 20.8°C | 10.8°C | 38 mm | 86% | 3.5 m/s | 4.9 |
| 2021 🔥 | 18.7°C | 16.0°C | 13.3°C | 24.1°C | 11.6°C | 37 mm | 86% | 2.4 m/s | 5.4 |
| 2020 🌧️ | 15.8°C | 13.6°C | 11.5°C | 18.3°C | 9.6°C | 139 mm | 86% | 3.9 m/s | 4.2 |
| 2019 | 17.2°C | 15.0°C | 12.8°C | 20.6°C | 9.5°C | 96 mm | 88% | 3.7 m/s | 4.7 |
| 2018 | 18.1°C | 15.5°C | 12.8°C | 21.1°C | 11.1°C | 65 mm | 85% | 2.9 m/s | 5.2 |
| 2017 | 16.7°C | 14.1°C | 11.5°C | 20.1°C | 8.8°C | 120 mm | 86% | 3.6 m/s | 4.9 |
| 2016 | 16.5°C | 14.2°C | 11.8°C | 21.2°C | 8.6°C | 112 mm | 87% | 3.6 m/s | 4.4 |
| 2015 | 15.4°C | 13.2°C | 11.0°C | 19.3°C | 8.8°C | 110 mm | 86% | 4.3 m/s | 4.6 |
| 2014 | 17.7°C | 15.3°C | 12.8°C | 21.5°C | 10.1°C | 58 mm | 85% | 3.1 m/s | 5.1 |
| 2013 | 18.6°C | 15.9°C | 13.2°C | 23.3°C | 9.9°C | 44 mm | 85% | 2.7 m/s | 5.7 |
| 2012 | 15.5°C | 13.4°C | 11.2°C | 18.4°C | 8.6°C | 111 mm | 87% | 3.7 m/s | 4.5 |
| 2011 | 16.2°C | 13.8°C | 11.5°C | 18.8°C | 9.1°C | 71 mm | 84% | 3.6 m/s | 5.4 |
| 2010 | 16.7°C | 14.5°C | 12.3°C | 19.7°C | 10.2°C | 132 mm | 87% | 4 m/s | 4.3 |
| 2009 | 16.4°C | 14.3°C | 12.2°C | 21.1°C | 9.6°C | 110 mm | 87% | 4.3 m/s | 5 |
| 2008 | 16.3°C | 14.2°C | 12.1°C | 19.7°C | 9.2°C | 113 mm | 88% | 4.3 m/s | 4.4 |
| 2007 | 16.0°C | 13.9°C | 11.8°C | 17.8°C | 9.2°C | 97 mm | 86% | 3.6 m/s | 5 |
| 2006 | 18.5°C | 15.9°C | 13.3°C | 22.9°C | 10.1°C | 56 mm | 86% | 3.1 m/s | 5.4 |
| 2005 | 16.8°C | 14.5°C | 12.3°C | 22.2°C | 10.0°C | 60 mm | 87% | 3.4 m/s | 4.8 |
| 2004 | 15.7°C | 13.5°C | 11.3°C | 19.1°C | 9.4°C | 57 mm | 86% | 3.6 m/s | 4.8 |
| 2003 | 17.1°C | 15.0°C | 12.8°C | 22.0°C | 10.6°C | 73 mm | 88% | 3.9 m/s | 4.7 |
| 2002 | 15.6°C | 13.4°C | 11.2°C | 18.4°C | 9.2°C | 105 mm | 87% | 3.5 m/s | 4.3 |
| 2001 | 16.3°C | 14.0°C | 11.8°C | 19.6°C | 8.6°C | 71 mm | 87% | 3.7 m/s | 5 |
| 2000 | 16.3°C | 14.0°C | 11.6°C | 18.9°C | 8.9°C | 42 mm | 86% | 3.2 m/s | 5.3 |
| 1999 | 17.5°C | 15.0°C | 12.5°C | 21.9°C | 10.6°C | 61 mm | 86% | 3.5 m/s | 5.3 |
| 1998 | 15.8°C | 13.7°C | 11.6°C | 17.0°C | 9.7°C | 105 mm | 87% | 4.7 m/s | 4.7 |
| 1997 | 16.9°C | 14.5°C | 12.1°C | 20.3°C | 9.2°C | 99 mm | 87% | 3.4 m/s | 4.9 |
| 1996 | 16.1°C | 13.9°C | 11.6°C | 20.2°C | 8.9°C | 82 mm | 85% | 3.7 m/s | 4.8 |
| 1995 | 17.6°C | 15.3°C | 13.0°C | 21.6°C | 9.9°C | 84 mm | 87% | 3.8 m/s | 4.9 |
| 1994 | 16.3°C | 14.1°C | 11.9°C | 18.1°C | 9.9°C | 68 mm | 87% | 3.2 m/s | 4.8 |
| 1993 ❄️ | 15.2°C | 13.0°C | 10.8°C | 18.4°C | 7.4°C | 74 mm | 86% | 4.4 m/s | 4.3 |
| 1992 | 16.4°C | 14.0°C | 11.7°C | 18.6°C | 9.8°C | 78 mm | 85% | 4.1 m/s | 4.4 |
| 1991 | 17.3°C | 14.9°C | 12.6°C | 20.6°C | 10.2°C | 47 mm | 87% | 3.9 m/s | 4.7 |
| 1990 | 16.9°C | 14.5°C | 12.0°C | 19.4°C | 7.8°C | 63 mm | 84% | 4.3 m/s | 5.1 |
| 1989 | 18.2°C | 15.5°C | 12.7°C | 22.0°C | 10.3°C | 34 mm | 84% | 3.3 m/s | 5.3 |
| 1988 | 15.2°C | 13.1°C | 11.0°C | 18.7°C | 9.4°C | 127 mm | 85% | 4.8 m/s | 4.2 |
| 1987 | 16.3°C | 14.0°C | 11.7°C | 19.3°C | 8.7°C | 80 mm | 87% | 3.9 m/s | 4 |
| 1986 | 15.5°C | 13.3°C | 11.1°C | 20.4°C | 8.1°C | 70 mm | 87% | 3.7 m/s | 3.6 |
| 1985 | 16.0°C | 13.6°C | 11.1°C | 19.1°C | 8.1°C | 111 mm | 87% | 3.8 m/s | 4 |
| 1984 | 17.1°C | 14.5°C | 11.9°C | 19.4°C | 7.9°C | 46 mm | 84% | 3.5 m/s | 5.1 |
| 1983 | 18.6°C | 15.8°C | 13.1°C | 24.3°C | 9.9°C | 22 mm | 84% | 2.5 m/s | — |
| 1982 | 16.8°C | 14.3°C | 11.9°C | 19.8°C | 9.9°C | 34 mm | 84% | 2.9 m/s | — |
| 1981 | 15.9°C | 13.6°C | 11.4°C | 19.1°C | 9.2°C | 79 mm | 86% | 4.3 m/s | — |
Actual recorded July data for each year, 1981–2025 — sourced from NASA POWER.
The average high in July is around 16.7°C with lows near 12°C (mean 14.4°C), based on 45 years of NASA POWER data.
July averages 80 mm of rainfall in Belfast, about average for rainfall. The wettest on record was 139 mm in 2020.
The hottest July reached 24.3°C in 1983. The coldest dipped to 7.4°C in 1993.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average July temperatures have risen by about 0.6°C. Daytime highs moved from 16.9°C to 17.4°C and overnight lows from 11.9°C to 12.6°C over the same span.
July is one of the warmer months of the year in Belfast and about average for rainfall, so plan for around 16.7°C daytime highs and 12°C at night.
Not quite — July is the 11th coolest month in Belfast, averaging 14.4°C.
For July in Belfast, pack light layers you can adjust through the day, with typical highs of 16.7°C and lows of 12°C. Bring an umbrella or light rain jacket too.
Relative humidity in July averages 86% — quite humid.
Average wind speed in July is 3.7 m/s. The windiest July on record averaged 4.8 m/s (1988).
The wettest July on record was 2020 with 139 mm. On average, July sees 80 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Belfast behaves each July, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for July specifically, along with year-by-year records and how the month has changed over the decades.
